Techno-economic analysis of the influence of different operating conditions on gas turbine centrifugal compressor set performance (original) (raw)
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An Investigation on the Performance Characteristics of a Centrifugal Compressor
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The performance of an automotive turbocharger centrifugal compressor has been studied by developing a comprehensive one-dimensional (1D) code as verified through experimental results and a three-dimensional (3D) model. For 1D analysis, the fluid stream in compressor is modeled using governing gas dynamics equations and the loss mechanisms have been investigated and added to the numerical model. The objective is to develop and offer a 1D model, which considers all loss mechanisms, slip, blockage and also predicts the surge margin and choke conditions. The model captures all features from inlet duct through to volute discharge. Performance characteristics are obtained using preliminary geometry and the blade characteristics. A 3D numerical model was also created and a viscous solver used for investigating the compressor characteristics. The numerical model results show good agreement with experimental data through compressor pressure ratio and efficiency. The effect of the main compre...
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The paper presents the results of CFD-calculations of a centrifugal compressor stage with a high-pressure 3D impeller and a vaneless diffuser. The stage was designed by Prof. A. M. Simonov in the Problem Laboratory of Compressor LPI according to the following design parameters: flow rate coefficient 0.080, loading factor 0.74, and the relative Mach number 0.78. Two design grids were used: 2.4 and 4.4 million cells for the sector with one blade. The entire stage was calculated with a sparser grid. Special “Stage” interface conditions are used to interface the gas-dynamic parameters at the boundary regions. The SST turbulence model was used in the calculations. The results of efficiency characteristics and work coefficient comparison showed the following: in design flow rate all three variants of the calculation overstate the loading factor by 14.3%; the calculated characteristics of polytrophic work coefficient in the staging of 360 degrees are closest to the experimental characteris...
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In this study, various investigations were performed on the reduction of calculation errors of compressor models which can calculate compressor performance (pressure ratio, rotational speed) at an arbitrary operating point. For this purpose, three compressor models, including the Jensen & Kristensen model and the newly modified model, are presented in this study. By applying these models, the compressor pressure ratio and rotational speed prediction calculation results are compared with four other compressors. From these, we confirmed the performance characteristics of each model and reduced calculation errors near the surge limit, near the choking limit, and in the high speed range, which was a problem in the standard J & K compressor model. Also, the application performance of the compressor model during actual engine operation is presented through an experiment with a 1.4 liter WGT diesel engine. The pressure measurement error had a large effect on the calculation error of the low rotational speed region, and the influence decreased as the rotational speed increased. The calculation error of the compressor rotational speed was less than 10 % when the rotational speed was higher than 33 % of the maximum rotational speed of the compressor, and accuracy was improved as the rotational speed increased.
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This work presents the design of a centrifugal compressor for natural gas in three steps. The first step is the 1-D preliminary design heavily based on empirical data, only the design point was considered here. The second step is the flow analysis in the meridional plane. The last step is the CFD analysis to verify if the 1-D design methodology is adequate. The CFD simulations showed good agreement with the results obtained in the preliminary design, proving the importance of empirical data in the design of centrifugal compressors.
A Study on Centrifugal Compressor Performance and Developing CompressorPerformance Analysis Software
2011
This report basically discusses the research and the work done on the project entitles A Study on Centrifugal Compressor Performance and Developing Compressor Performance Analysis Software. The objective of this project is to study centrifugal compressor behavior and analyze factors that affect the performance of compressor. Compressors have a limited operational range that operator will take into seriously. If exceeded will cause damage to the compressor. Moreover, centrifugal compressors are costly processing equipment and also consume a lot of energy. Thus, it is crucial to monitor and controlled compressor performance. Polytropic head are plotted to trend real time performance monitoring for centrifugal compressors as it consider changes in gas characteristics during compression. By using Microsoft Excel 2008, the author can automatically get the outputs by inserting all the data into a calculation sheet after put in required formulas as a function in Excel. From the compressor performance map one can analyze the behavior of compressor in real time operation. By trending necessary variables against time, operator can do a planning on troubleshoot and also composition analysis. All the theory can be validate by analyzing the results. The author also manage to construct an interface to determine compressibility factor, Z and polytropic head using Visual Basic Application. iii ACKNOWLEDGEMENTS This final year project would not have been possible without the guidance and the help of several individuals who in one way or another contributed and extended their valuable assistance in the preparation and completion of this study. First and foremost, my utmost gratitude to my supervisor Mr Mohd Faizairi Bin Mohd Nor for the continuous support of my final year project, for his patience, motivation, enthusiasm, and immense knowledge. His guidance helped me in all the time of research and writing of this final report. I could not have imagined having a better supervisor and mentor for my final year project. Besides my supervisor, I would like to thank Mr Syarizan Ishak for his assistance and guidance on completing this project and providing necessary information. Engineering students who in one way or another were helps in giving assistance to understand the physics part of my project. Last but not the least, I would like to thank my family: especially my parents Abdul Halim Harun and Zainab Abdullah, for giving birth to me at the first place and supporting me spiritually throughout my life and the one above all of us Allah for answering my prayers and giving me the strength to complete my final year project. iv