The Effect of Rotor Tip Gaps on the 3D Separating Flows Inside the Downstream Stator of a Highly Loaded Compressor Stage
Flow separations in compressor blade passages are common and can cause significant flow blockage and losses production in some instances.In this paper,the three-dimensional flow separations in a highly loaded low-speed large-scale compressor facility experimentally is investigated.Oil flow visualizations are conducted at certain conditions from the near-chock to near-stall condition along the compressor operating line.According to the topological analyses,3D separation and vortex flow structures in the stator at different operating conditions are analyzed and reconstructed.By changing the height of tip clearance of the rotor,three groups of oil-flow pictures are obtained to study the effect of the rotor gaps on the 3D separating flows in the downstream stator.It can be concluded that at large mass-flow-rate conditions,the effect of decrease of the rotor tip clearance on the 3D separating flows inside the stator passage is very slight as there is only little change on the 3D separation structures at both the two corners of the suction surface; at small mass-flow-rate conditions,when the rotor tip gaps reduce,decrease of the axial velocity makes the significant increase of incidence angle of the stator.In this case,the redistribution of the mass in the stator passage caused by the decrease of rotor tip gaps will easily bring about stall near the hub.The reasonability and reliability of the analyses results are finally validated by the SPIV results.
3D Separating Flows Oil flow visualizations Rotor tip clearance Stereoscopic PIV Highly loaded compressor
Baojie Liu Guangfeng An Xianjun Yu Zhibo Zhang
School of Energy and Power Engineering,National Key Laboratory of Science & Technology on Aero-Engine Aero-Thermodynamics,Beihang University,Beijing,100191,Peoples Republic of China
国际会议
The 5th International Symposium on Jet Propulsion and Power Engineering(第五届喷气推进与动力工程国际会议)
北京
英文
1-10
2014-09-15（万方平台首次上网日期，不代表论文的发表时间）