Optimization design of a low pressure centrifugal compressor in a MW size gas turbine
LI Peiyuan1,2, GU Chunwei1,2, SONG Yin1,2
1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;
2. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China
Abstract：A one-dimensional optimization design system based on iSIGHT was used to optimize the matching of a diffuser with a centrifugal impeller. The system was then used to optimize the geometry and matching characteristics of a low pressure stage centrifugal compressor for a MW size gas turbine. The results show that the diffuser and impeller are not well matched in the original design. The diameter ratio of the vaneless diffuser is too large, resulting in low efficiencies throughout the entire stage. The one-dimensional optimization results are used to redefine the diffuser geometry to improve the performance. The vaneless diffuser outlet diameter is reduced and the original single stage diffuser is replaced by a tandem vane diffuser. The optimization significantly improves the performance of the entire stage. The pressure ratio is increased by about 4% and the efficiency is increased by about 2%.
李培元, 顾春伟, 宋寅. 某MW级燃机低压离心压气机优化设计[J]. 清华大学学报（自然科学版）, 2015, 55(10): 1110-1116.
LI Peiyuan, GU Chunwei, SONG Yin. Optimization design of a low pressure centrifugal compressor in a MW size gas turbine. Journal of Tsinghua University(Science and Technology), 2015, 55(10): 1110-1116.
 Galvas M R. FORTRAN Program for Predicting Off-Design Performance of Centrifugal Compressors [R]. TN D-7487. Cleveland, OH: NASA, 1952.
 Aungier R H. Mean streamline aerodynamic performance analysis of centrifugal compressors [J]. Journal of Turbomachinery, 1995, 117(3): 360-366.
 Oh H W, Yoon E S, Chung M K. An optimum set of loss models for performance prediction of centrifugal compressors [J]. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 1997, 211(4): 331-338.
 Conrad O, Raif K, Wessels M. The calculation of performance maps for centrifugal compressors with vane-island diffusers [C]// ASME Twenty-fifth Annual International Gas Turbine Conference and Twenty Second Annual Fluids Engineering Conference on Performance Prediction of Centrifugal Pumps and Compressors. New Orleans, LA: ASME, 1980: 135-147.
 Jansen W. A method for calculating the flow in a centrifugal impeller when entropy gradients are present [C]// Royal Society Conference on Internal Aerodynamics (Turbomachinery). London: Institution of Mechanical Engineers, 1967: 133-146.
 Coppage J E, Dallenbach F, Eichenberger H P, et al. Study of Super-Sonic Radial Compressors for Refrigeration and Pressurization Systems [R]. WADC Report 55-257. Los Angeles, CA: AiResearch Mfg Div, Garrett Corp, 1956.
 Johnston J P, Dean J R. Losses in vaneless diffusers of centrifugal compressors and pumps: Analysis, experiment, and design [J]. Journal of Engineering for Gas Turbines and Power, 1966, 88(1): 49-62.
 Daily J W, Nece R E. Chamber dimension effects on induced flow and frictional resistance of enclosed rotating disks [J]. Journal of Fluids Engineering, 1960, 82(1): 217-232.
 Rodgers C. Influence of Impeller and Diffuser Characteristics and Matching on Radial Compressor Performance [R]. SAE 610159. Warrendale, PA: SAE, 1961.
 Japikse D. Centrifugal Compressor Design and Performance [M]. Wilder, VT: Concepts ETI, 1996.
 McKain F, Holbrook J. Coordinates for a High Performance 4∶1 Pressure Ratio Centrifugal Compressor [R]. CR-204134. Detroit, MI: NASA, 1997.
 Skoch G J, Prahst P S, Wernet M P, et al. Laser Anemometer Measurements of the Flow Field in a 4∶1 Pressure Ratio Centrifugal Impeller [R]. TM-107541. Cleveland, OH: NASA, 1997.