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Experimental and numerical investigation on the effect of blade number on vibrations of industrial fans
, Article COMADEM 2010 - Advances in Maintenance and Condition Diagnosis Technologies Towards Sustainable Society, Proc. 23rd Int. Congr. Condition Monitoring and Diagnostic Engineering Management, 28 June 2010 through 2 July 2010 ; February , 2010 , Pages 473-480 ; 9784883254194 (ISBN) ; Ebrahimi, A ; Oskouie, S. N ; Massoumi, H ; Sharif University of Technology
Abstract
In this paper, the effect of blade number on the vibration behavior of industrial fans has been studied experimentally and numerically. Two similar industrial fans with similar specifications and only different blade numbers were chosen in a plant. The vibration levels were measured on these fans and the results revealed that the blade passage phenomenon is the main cause of vibrations on both fans. Both fans and their structures were modeled numerically and the performance characteristics, vibratory forces and vibration response of structure were calculated. The results showed that the number of blade has small effect on vibratory forces compared to the performance characteristics. The...
Theoretical and experimental investigation of design parameter effects on the slip phenomenon and performance of a centrifugal compressor
, Article Scientia Iranica ; Volume 28, Issue 1 , 2021 , Pages 291-304 ; 10263098 (ISSN) ; Hajilouy Benisi, A ; Manzari, M. T ; Sharif University of Technology
Sharif University of Technology
2021
Abstract
Numerous studies have investigated driving equations used to predict the slip factor in centrifugal compressors so far. Inevitably, through these studies, the ow field characteristics have been simplified and the effects of the related parameters have been neglected. The present study, experimentally and numerically, investigates the slip phenomenon in a specific centrifugal compressor with complex blade curves and splitter blades, considering the main effective parameters such as the number of blades, exit angle, etc. To this end, a three-dimensional simulation of the viscous flow field of the compressor via an appropriate turbulence method was performed. In addition, an experimental study...
Effect of splitter leading edge location on performance of an automotive turbocharger compressor
, Article Energy ; Volume 123 , 2017 , Pages 511-520 ; 03605442 (ISSN) ; Hajilouy Benisi, A ; Durali, M ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
Design of centrifugal compressors can be accomplished using methods provided in text books and open literature. In this general approach, after determination of dimensions in meridional plane, blade profiles are designed using aerodynamic methods. Then, some blades are trimmed at the beginning to avoid inlet blockage. But there is no clear guidance on how this trimming must be performed. With this widely implemented method, splitter blades have the same profile as main ones. In this research, blade profiles and dimensions of the compressor impeller are not changed while the effect of changes in the position and angle of splitters leading edge are investigated. An optimization scheme is...
Multilevel optimization of the splitter blade profile in the impeller of a centrifugal compressor
, Article Scientia Iranica ; Volume 24, Issue 2 , 2017 , Pages 707-714 ; 10263098 (ISSN) ; Hajilouy Benisi, A ; Durali, M ; Sharif University of Technology
Sharif University of Technology
2017
Abstract
In this research, multi-level optimization of the profile of the splitter blades of a turbocharger compressor is performed using genetic algorithm in order to improve its performance. Successive corrections of the profile at hub, mid-span, and shroud of the splitter blades, with the objective of decreasing the incidence losses at the leading edge and adjustment of the blade loading at the shroud, result in an impeller having improved splitter blades. The impeller flow field analysis shows that the optimization has been successful in reducing the flow leakage at the shroud region as well as the losses in the leading edge region. Although numerical simulations predict a decrease by 0.5% in...
Experimental investigation of blade number and design effects for a ducted wind turbine
, Article Renewable Energy ; Volume 105 , 2017 , Pages 334-343 ; 09601481 (ISSN) ; Kamali Monfared, R ; Rad, M ; Sharif University of Technology
Abstract
Over the recent decades, many different ducted turbines have been designed to augment efficiency of wind turbines. The design and number of blades are the most important parameters to optimize efficiency of wind turbines. In this paper, effects of design, number and attack angles of blades on rotational speed are experimentally studied in a duct which increases wind velocity up to 2.46 times numerically and 2.32 times experimentally as great as far-field flow. In order to realize this, 3 different types of aerodynamic blades were designed and then, 2-bladed, 3-bladed and 4-bladed impellers were created by these blades; finally, 9 impellers were built on aggregate. The rotational speed of...
Representative pumping wells network to estimate groundwater withdrawal from aquifers: Lessons from a developing country, Iran
, Article Journal of Hydrology ; Volume 578 , 2019 ; 00221694 (ISSN) ; Mossa Hosseini, S ; Ataie Ashtiani, B ; Simmons, C. T ; Sharif University of Technology
Elsevier B.V
2019
Abstract
In this study a review of the developed methods to estimate groundwater withdrawal (GWW) from aquifers by pumping wells is provided. Then, a method adopted by Iran's Basic Studies Bureau of Water Resources Management Company for estimation of GWW through 536 aquifers across Iran is presented and modified. This so-called “representative pumping wells network” (RPWN) approach is a combination of statistical and rate-and-time methods which has been implemented for all aquifers in Iran since 2007. The RPWN approach is based on the overlaying of 10 important features in a GIS environment and classified in a number of zones in which their withdrawals are statistically different. The representative...