Multiobjective Optimization and Design of S-Shaped Compressor Transition Duct
Optimization of S-shaped compressor transition duct is carried out using Genetic Algorithm. As providing a favorable condition for the downstream compressor is crucial for the transition duct, which connects high and low pressure compressor, exit flow uniformity is considered as another design objective beside duct loss. A new parametrization scheme, in which only two independent parameters are needed, i.e., Mid Way Offset Ratio(MWOR) and Control Point Area Ratio(CPAR), is adopted for the design of duct geometry. Loss optimization, uniformity optimization and synthesis multiobjective optimization of both loss and uniformity were carried out respectively. The performance of transition duct is improved for all the three optimization cases, in which the multiobjective optimization gains a comprehensive performance improvement, with a loss coefficient reduced by 3％, while the nonuniformity is decreased by 19％. Analysis of the optimization results gives an insight view of the underlying mechanism: shifting the loading forward and alleviating the adverse pressure gradient at the rear part of the hub can mitigate the risk of flow separation in the duct, thus decrease duct loss, meanwhile, a flatter outlet tends to reduce radial gradient of outflow, and improve flow uniformity at the duct exit All these features could be closely correlated to the design variables MWOR and CPAR. For a moderate loading transition duct investigated in this paper, the best performance appears when MWOR is between O.SS to 0.65, and CPAR is around 1.1.
transition duct s-shaped fan/compressor pressure gradient aerodynamic design
Que Xiaobin Hou Anping Zhou Sheng
National Key Laboratory on Aero-Engines, School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing, China
国际会议
The 3rd International Symposium on Jet Propulsion and Power Engineering(第三届喷气推进与动力工程国际会议 ISJPPE)
南京
英文
121-126
2010-09-13（万方平台首次上网日期，不代表论文的发表时间）