Profile and Secondary Flow Losses in a High-Lift LPT Blade Cascade at Different Reynolds Numbers under Steady and Unsteady Inflow Conditions  

作　　者：Satta F. Simoni D. Ubaldi M. Zunino P. Bertini F. 

机构地区：[1]DIMSET-Università di Genova,Via Montallegro 1,I-16145 Genova,Italy [2]Avio S.p.A.,Viale I Maggio 56,I-10040 Rivalta(TO)-Italy

出　　处：《Journal of Thermal Science》2012年第6期483-491,共9页热科学学报（英文版）

摘　　要：The aerodynamic flow field downstream of a Low-Pressure High-Lift(HL)turbine cascade has been experimentally investigated for different Reynolds numbers under both steady and unsteady inflows,in order to analyse the cascade performance under real engine operating conditions.The Reynolds number has been varied in the range 100000<Re<300000,where lower and upper limits are typical of cruise and take-off/landing conditions,respectively.The effects induced by the incoming wakes at the reduced frequency f+=0.62 on both profile and secondary flow losses have been investigated.Total pressure,velocity and secondary kinetic energy distributions at the downstream tangential plane have been measured by means of a miniaturized 5-hole probe.These quantities provide information on both blade wake and secondary flow structures(passage and horse-shoe vortices).The analysis of the results allows the evaluation of the aerodynamic performance of the HL front-loaded blade in terms of both profile and secondary losses.

关 键 词：profile losses secondary flow losses high-lift profdes unsteady inflow LPT blade. 

分 类 号：TK14[动力工程及工程热物理—热能工程]