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Total 45 records

    Performance prediction of twin-entry turbocharger turbines

    , Article Iranian Journal of Science and Technology, Transaction B: Engineering ; Volume 29, Issue 2 , 2005 , Pages 145-155 ; 03601307 (ISSN) Ghassemi, S ; Shirani, E ; Hajilouy Benisi, A ; Sharif University of Technology
    2005
    Abstract
    In this paper, the performance of the twin-entry radial flow turbine under steady state and partial admission conditions is modeled. The method, which is developed here, is based on one-dimensional performance prediction. In one-dimensional modeling, the flow properties are assumed constant on a plane normal to the flow direction. This assumption is in contrast with the flow at the rotor entry of a twin-entry turbine under partial admission condition. In this study the one-dimensional performance prediction method for a single-entry turbine is modified to analyze the twin-entry turbine. In particular, the loss coefficients due to friction, clearance and blade loading, which are already... 

    Effects of altitude and temperature on the performance and efficiency of turbocharged direct injection gasoline engine

    , Article Journal of Applied Fluid Mechanics ; Volume 12, Issue 6 , 2019 , Pages 1825-1836 ; 17353572 (ISSN) Motahari, S ; Chitsaz, I ; Sharif University of Technology
    Isfahan University of Technology  2019
    Abstract
    Iran is located at the high altitude region and has a diverse four season climate. The temperature difference of two locations at the same time reaches to 50° C. Therefore, the modern direct injection turbocharged engines are highly affected at this condition. This paper deals with the effects of temperature and pressure variations on the engine performance and fuel consumption of turbocharged gasoline direct injection engine. Ford ecoboost is selected for this study and the base experiments are performed at the sea level. At the next step, a comprehensive one-dimensional model of the engine is constructed in GT power and validated with experimental data. Validated model is implemented to... 

    Effects of altitude and temperature on the performance and efficiency of turbocharged direct injection gasoline engine

    , Article Journal of Applied Fluid Mechanics ; Volume 12, Issue 6 , 2019 , Pages 1825-1836 ; 17353572 (ISSN) Motahari, S ; Chitsaz, I ; Sharif University of Technology
    Isfahan University of Technology  2019
    Abstract
    Iran is located at the high altitude region and has a diverse four season climate. The temperature difference of two locations at the same time reaches to 50° C. Therefore, the modern direct injection turbocharged engines are highly affected at this condition. This paper deals with the effects of temperature and pressure variations on the engine performance and fuel consumption of turbocharged gasoline direct injection engine. Ford ecoboost is selected for this study and the base experiments are performed at the sea level. At the next step, a comprehensive one-dimensional model of the engine is constructed in GT power and validated with experimental data. Validated model is implemented to... 

    Evaluation of imperial performance characteristic of turbocharger turbine and compressor

    , Article 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference Proceedings, San Francisco, CA, 5 June 2006 through 8 June 2006 ; Volume 2 , 2006 , Pages 1019-1028 ; 1563478153 (ISBN); 9781563478154 (ISBN) Rad, M ; Hajilouy, A ; Shahhosseini, M. R ; Sharif University of Technology
    2006
    Abstract
    Performance characteristics of turbocharger turbine and compressor such as efficiency, mass parameter and power are determined experimentally at turbocharger laboratory. Accurate determination of the performance map is significant for manufacturers as well as end users. To this end accurate measurement of test parameters such as temperature, pressure, and speed are required. In this paper an analytic method to predict the measurement uncertainties in turbocharger laboratory, is described. Furthermore the effect of each test parameter on the performance uncertainty is considered. Test parameters that have the most significant influence on the performance uncertainties are identified.... 

    Enhancement of Performance Characteristic of “M15GS” Engine with Matching Suitable Turbocharger

    , M.Sc. Thesis Sharif University of Technology Nikoumanzari, Mehdi (Author) ; Saeedi, Mohammad Hassan (Supervisor)
    Abstract
    Duo to the strictly pollution legislation in the last decade and increasing demand of lightweight internal combustion engines with rated power , turbocharging of the spark ignition engines become more interested. Therefore the turbocharging of M15GS engine was studied in both gasoline and natural gas fuels with purpose of enhancement of performance characteristic of engine. According to this approach 0-D turbocharger matching performed for gasoline and natural gas fueled M15GS engine. Also an innovative 1-D turbocharger matching performed for gasoline fueled engine. Then engine equipped with SJ50 turbocharger and dynamometer and combustion development tests performed on gasoline fueled... 

    Theoretical and Experimental Investigations of Turbocharger Matching on a Naturally Aspirated Diesel Engine

    , M.Sc. Thesis Sharif University of Technology Shams Derakhshan, Mohamad Amin (Author) ; Hajilouy Benisi, Ali (Supervisor)
    Abstract
    Diesel engines have widely used in past hundred years. During this time costly and extensive researches have been done to improve engine performance, which is going on. Important issues of these engines are higher specific power and efficiency and lower specific fuel consumption and pollutions formation. One of the best methods for engine performance improvement is matching a convenient turbocharger on engine. A turbocharger increases the engine air mass flow rate by increasing the inlet pressure and density. Due to increase of fresh air mass flow rate, fuel mass flow rate and power would increase. The aim of this research is to choose the convenient turbocharger for the OM355 naturally... 

    An experimental and theoretical study of the effects of excess air ratio and waste gate opening pressure threshold on NOx emission and performance in a turbocharged CNG SI engine

    , Article International Journal of Engineering, Transactions B: Applications ; Volume 28, Issue 2 , March , 2015 , Pages 251-260 ; 1728-144X (ISSN) Kharazmi, S ; Benisi, A. H ; Mozafari ; Sharif University of Technology
    Materials and Energy Research Center  2015
    Abstract
    In this research, effects of excess air ratio and waste gate opening pressure threshold on NOx emission and performance in a turbocharged CNG SI engine are studied experimentally at 13-mode ECE-R49 test cycle. The engine power, boost ratio and charge air temperature are investigated experimentally at the cycle for different waste gate pressure thresholds. A code is developed in MATLAB environment for predicting engine performance and NOx and the results are validated with the research experiments. The effects of excess air ratio on the engine indicated power and specific fuel consumption as well as NOx emission are numerically investigated at WOT by the code. NOx emission of WOT is max at... 

    Computer simulation of turbocharged aftercooled gasoline engine

    , Article 8th Biennial ASME Conference on Engineering Systems Design and Analysis, ESDA2006, Torino, 4 July 2006 through 7 July 2006 ; Volume 2006 , 2006 ; 0791837793 (ISBN); 9780791837795 (ISBN) Kharazmi, S ; Hajilouy Benisi, A ; Mozafari, A. A ; Sharif University of Technology
    American Society of Mechanical Engineers  2006
    Abstract
    Turbocharging of gasoline engines has been improved less than diesel engines due to some difficulties, especially knock phenomena. They require wider air flow range and faster response too. A computer code is developed to simulate turbocharged gasoline engine behavior. A three zone combustion model is employed. Different performance curves at speed and equivalence ratio ranges are prepared. By this code naturally aspirated and turbocharged behavior are compared. A turbocharged aftercooled engine has been studied in various cases to complete the investigation. Some aftercooler effects are described experimentally. Modeling and experimental results are compared providing valuable achievements.... 

    Empirical assessment of the performance characteristics in turbocharger turbine and compressor

    , Article Experimental Techniques ; Volume 34, Issue 3 , July , 2010 , Pages 54-67 ; 07328818 (ISSN) Hajilouy Benisi, A ; Rad, M ; Shahhosseini, M. R ; Sharif University of Technology
    2010
    Abstract
    The performance parameter uncertainties of turbomachines at different rotational speed were determined by experimental and analytical consideration. The instruments/sensors were located and installed according to the standards for evaluating the performance characteristics of turbine and compressor in a turbocharger laboratory in a wide range of rotational speeds. The comparison of turbine and compressor sensitivity shows that the sensitivity of compressor to 1% shift in the pressure is higher than that for the turbine. Results also show that the sensitivities of efficiency and power of turbine reduce as rotational speed increases. The total uncertainty of turbine and compressor are obtained... 

    A predictive control of a turbocharged diesel engine for exhaust emission mitigation

    , Article 41st Annual Conference of the IEEE Industrial Electronics Society, 9 November 2015 through 12 November 2015 ; 2015 , Pages 4890-4895 ; 9781479917624 (ISBN) Nademi, H ; Tahami, F ; IEEE Industrial Electonics Society (IES)
    Institute of Electrical and Electronics Engineers Inc 
    Abstract
    This paper investigates the control of diesel engines comprising two actuators: exhaust gas recirculation (EGR) valve and variable geometry turbocharger (VGT) to mitigate the exhaust emissions. In contrast to conventional control techniques, multi-model predictive control (MMPC) algorithm is employed for control purposes. With the help of proposed scheme, constraints of the control problem is also considered and nonlinear model to enhance performance is utilized. In doing so, new controller tries to fulfill a compromise between fuel consumption and torque response by regulating air-to-fuel ratio and EGR fraction to decrease pollutants emission especially nitrogen oxides (NOx). The dynamic... 

    Aerodynamic design of a twin-entry radial-inflow turbine impeller: a numerical and experimental investigation

    , Article Green Energy and Technology ; 2018 , Pages 153-170 ; 18653529 (ISSN) Vaezi, S ; Irandoost Shahrestani, M ; Ravosh, F ; Sharif University of Technology
    Springer Verlag  2018
    Abstract
    In this research, aerodynamic design of a twin-entry radial-inflow turbine was done based on the direct method using a developed design code. The Garrett turbocharger was chosen for this purpose. At the first step, the 1D design, based on the impeller efficiency convergence, was performed. In 3D design, which is divided into preliminary and detail design, the profiles of the impeller and blade angle was carried out. Afterward the 3D shape of the blade can be achieved by combining these profiles. There is a good geometrical agreement between designed impeller and the laboratory’s existing impeller in both steps. In order to predict the performance of the turbine, the 1D analysis code was... 

    Experimental and theoretical investigation of twin-entry radial inflow gas turbine with unsymmetrical volute under fulland partial admission conditions

    , Article 2007 ASME Turbo Expo, Montreal, Que., 14 May 2007 through 17 May 2007 ; Volume 6 PART B , 2007 , Pages 1099-1107 ; 079184790X (ISBN); 9780791847909 (ISBN) Aghaali, H ; Hajilouy Benisi, A ; Sharif University of Technology
    2007
    Abstract
    In this paper the performance characteristics of turbocharger twin-entry radial inflow gas turbine with unsymmetrical volute and rotor tip diameter of 73.6 mm in steady state and under full and partial admission conditions are investigated. The employed method is based on one dimensional performance prediction which is developed for partial admission conditions. Furthermore this method is developed for unsymmetrical volute of the turbine considering flow specifications. Experimental investigation of the research carried out on special test facility under full and partial admission conditions for a wide range of speed. The comparison of experimental and modeling results shows good agreements.... 

    Performance prediction of twin-entry turbocharger turbines

    , Article Proceedings of the ASME Turbo Expo 2002; Aircraft Engine, Coal, Biomass and Alternative Fuels, Combustion and Fuels, Education, Electric Power, Vehicular and Small Turbomachines, Amsterdam, 3 June 2002 through 6 June 2002 ; Volume 1 , 2002 , Pages 1087-1095 Ghasemi, S ; Shirani, E ; Hajilouy Benisi, A ; The International Gas Turbine Institute ; Sharif University of Technology
    2002
    Abstract
    In this paper, the performance of the twin-entry radial flow turbine under steady state and partial admission conditions is modeled. The method, which is developed here, is based on one-dimensional performance prediction. In one-dimensional modeling, the flow properties are assumed constant on a plane normal to the flow direction. This assumption is in contrast with the flow at the rotor entry of a twin-entry turbine under partial admission condition. In this study the one-dimensional performance prediction method for single-entry turbine is modified to analyze the twin-entry turbine. In particular, the loss coefficients due to friction, clearance and blade loading, which are already... 

    Turbocharged Diesel Engine Upgrade Investigations and Matching it With a Suitable Turbocharger

    , M.Sc. Thesis Sharif University of Technology Jafary Moghadam, Pooria (Author) ; Hajilouy Benisi, Ali (Supervisor)
    Abstract
    Increasing the power of a turbocharged diesel engine without changing main engine components is important in industrial applications, with economic benefits. The engine power can be increased by higher boost pressure. In this research, the turbocharged diesel engine performance improvement was investigated to increase the engine power. As a case study, the performance improvement of OM355A turbocharged diesel engine carried out. For this purpose, the engine was modeled in boost module of the AVL software. First, naturally aspirated OM355 and turbocharged OM355A diesel engines were modeled. Then the simulation results were evaluated in compare with engine tests data. Maximum difference in... 

    Theoretical and Experimental Investigation of Losses in Twin-Entry Radial Inflow Gas Turbine under Full and Partial Admission Conditions

    , Ph.D. Dissertation Sharif University of Technology Shahhosseini, Majid Reza (Author) ; Rad, Manoucher (Supervisor) ; Hajilouy Benisi, Ali (Supervisor)
    Abstract
    The twin-entry radial inflow gas turbine is extensively used in engine turbochargers. The use of twin-entry radial flow turbine in the turbocharging systems makes it possible to use the kinetic energy of pulsating exhaust gases. This turbine is usually exposed to partial admission conditions in engine operating conditions, which the flows in each inlet are not equal for most of the time. This partial admission varies from zero flow in one entry with full admission in the other, to full flow in both entries. The flow pattern in this turbine is complex and three dimensional due to geometry and inlet conditions. Therefore, better understanding of the flow pattern and losses in the turbine can... 

    Design, Construction and Testing of a Turbojet Engine by Using a Turbocharger

    , M.Sc. Thesis Sharif University of Technology Beyrami, Mehdi (Author) ; Hajilouy Benisi , Ali (Supervisor)
    Abstract
    Turbojet engines are used widely in the aviation industry due to very high specific thrust. The design and manufacture of turbojet components are complex procedures and needs high technology. In this M. S.c Thesis, the structur and function of a turbojet engine are described. then all stages of design,manufacture ,test and control of a small turbojet engine which is developed by use of a turbocharger are specified. the design and construction of combustion chamber, exhaust nozzle, lubrication system, thrust measurement system, data acquisition system, fuel and ignition system ,control system and etc are carried out at Sharif University of Technology gas turbine laboratory. The one... 

    Power Boost Limitations of the Gasoline Turbocharged Engine

    , M.Sc. Thesis Sharif University of Technology Pourzal, Mohammad Amir (Author) ; Hajilouy Benisi, Ali (Supervisor) ; Mozafari, Ali Asghar (Supervisor)
    Abstract
    Nowadays internal combustion engines play an important role in the power generation as well as transportation fields all over the world. By using the turbocharger in internal combustion engine, more power is obtained in compare with aspirated engine having the same size, which is limited for gasoline engines. In this research, by a three-zone computer simulation code and experimental tests, the power boost limitations of the gasoline turbocharged engine are investigated. The results of single cylinder aspirated gasoline engine tests are used for validation the natural aspirated part of the code. For validating the turbocharged engine simulation, the results of a four cylinders gasoline... 

    Design and Fabrication Bi-fuel Gas Turbine Combustion Chamber Basis of Turbocharger

    , M.Sc. Thesis Sharif University of Technology Azari Barzandigh, Fariborz (Author) ; Farshchi, Mohammad (Supervisor) ; Hajilouy Benisi, Ali (Co-Advisor)
    Abstract
    This research is done as a continuation of previous efforts to develop a turbojet engine from a turbocharger at departments of mechanical and aerospace engineering of Sharif University of Technology and describes the necessary steps in order to design and build a dual fuel combustion chamber for a small, turbocharger based turbojet engine. At first, zero-dimensional analysis is done using a code written in Matlab. Using this code, matching of the compressor and turbine in the turbojet thermodynamic cycle is verified and the operating line of the turbojet engine has been extracted. Henceforth, operating conditions of the combustion chamber to start design process is determined. In designing... 

    Centrifugal Compressor Volute Design & Performance Optimization with Experimental Validation

    , Ph.D. Dissertation Sharif University of Technology Mojaddam, Mohammad (Author) ; Hajilouy Benisi, Ali (Supervisor) ; Movahhedy, Mohammad Reza (Supervisor)
    Abstract
    Radial Flow compressors have broad applications in aero-space, transport, gas and oil industries and etc. This type of compressor is a better choice in meeting constraints on weight and space, especially when continuous high pressure stream in low volumetric rate is of interest.
    Through main components of radial flow compressors, many investigations have been performed on design and optimization of the impellers and the diffusers, but the optimum design and optimization of compressor volute have received less attention.Volute design has direct and strong influence on compressor performance and its stable operating range.
    In this research numerical and experimental investigations is... 

    Theoretical and Experimental Investigation of The Wankel Engine Turbochargering

    , M.Sc. Thesis Sharif University of Technology Moslemzadeh, Mohsen (Author) ; Hajilouy Benisi, Ali (Supervisor) ; Mozafari, Ali Asghar (Supervisor)
    Abstract
    The Rotary Combustion Engines are known as Wankel Engines, for the first time designed and built by German inventor, Felix Wankel. In open letrecher, research reports about these engines are much less than piston engines. While, the wankel engine hase many advantages such as lower volume, less weight, less vibration and use of fuels lower octane number in compared with reciprocating engines. Therefore, it has particular importance in industries such as aircraft manufactueres.In this theses after the introduction chapter, Wankel engines and Turbochargers usage are reviewed. Then the Wankel engine and its turbocharging are searched in letrecher. Then, a computer code for simulation the Wankel...