Sharif Digital Repository

In this thesis, the use of jet-engine for oil well fire fighting which is a latest in kind is described and analyzed. For this purpose, more familiarization with this system and some knowledge’s such as hydrodynamics characteristic of nominated area, traditional ways of fire fighting in region, different types of jet engines available type of offshore vessels, type of flame and their characteristic are required, which after studying and analyzing above fields in details, the use of turbojet motors and barge has been chosen for the case to obtain optimum specification os this turbojet motors and required dimensions of barge Some information about oil well shuch as, fluid output, speed rate... 

In this research, steady state and transient performance of a single spool axial turbojet engine (without afterburner) is studied. Performance maps of main components such as; compressor, combustor and turbine are extracted from a similarity (geometry independent) approach.Then using nested loops method, steady state model of the turbojet engine is developed and using shaft dynamics and volume packing equations, transient model of the turbojet engine is analyzed. Steady state and transient simulations results of an engine are validated by experimental data and then effect of changes on input parameters such as; polar moment of inertia, Mach number, fuel heating value, pressure and... 

According to importance for modeling engine in propulsion subject and delecacies and complenity of this topic. Modeling turbofan engine has been chosen as the target of this project.Three methods are presented by this modeling and the results are compared. In addition, problems and shortcomings of each method are surveyed and stated. Surveying of each method is done step by step. In order to simplify description for any reader to reach the ultimate goal .In the beginning of the process, each coded method is stated full description .furthermore modeling process is illuminated. More ever, difference in methods is expressed. The results of three methods are processed and presented completely.... 

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... 

In this project Sharif Gas Turbine laboratory turbojet engine, and the turboshaft engine which is designed based on the turbojet gas generator are statically and dynamically modeled and required functions for turboshaft control are extracted. In static modeling a repetitive process is applied to reach static operation points. Static operation line and static characteristics of turbojet engine are extracted and compared to relevant sources. In dynamic modeling of turbojet engine a lumped volume is allocated to each component of engine and gas dynamic equations are solved in this volume along with individual performance map of engine components to acquire output characteristics in each time... 

In gas turbine industry, usually turboshaft engines are designed base on turbojet and turbofan gas generators. Hence, the overall cost of product design and manufacturing will decrease and sales and revenues will increase. It is also common to convert aerial engines with their flight life passed to industrial engines. In the present work, the conversion of an existing turbojet in the gas turbine lab of sharif university of technology to a turboshaft has been investigated. In the first step of project, the experimental data of turbojet performance are considered and the design point of the turboshaft engine will be determined. Then, nominal rotational speed of power turbine and zero to three... 

Gas turbine design and manufacturing is a complex process. It requires a true understanding of turbo machinery, materials, and manufacturing technologies. Current studyfocuses onthe design and test of a small turbo jet which is benefitted from a turbocharger. Zero dimensional analysis of engine cycle is done with MATLAB and results of program is utilized to design the combustion chamber and calibrating the nozzle. For determination of combustion chamber size, a reactor modelling is used. Simulation of flow in combustion chamber is done with a commercial program (Fluent) in order to determine other specification of combustion chamber such as hole sizing, diverging angle and etc.... 

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... 

In this research, it is aimed to convert a turbojet engine to a turboshaft by replacing the exhaust nozzle with a new designed power turbine stage. The design procedure is backed up with parametric studies to increase efficiency. At first a program is written for one dimensional modelling of the stage of axial turbine. By the way, the three dimensional modelling of the stage of axial turbine with Ansys-cfx business software is done. These methods are validated by modelling the gas generator turbine and comparison of their results with experimental results. Then the power turbine including the blades and the geometry of flow walls on shaft and casing are designed. The performance of power...