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Aerodynamic Loading Distribution Effects on the Overall Performance of Ultra-High-Lift LP Turbine Cascades

Journal of Thermal Science 2014年第1期23卷 1-12页

作者： M.Berrino F.Satta D.Simoni M.Ubaldi P.Zunino F.Bertini DIME Università degli Studi di Genova Via Montallegro 1I-16145 GenovaItaly Avio S.p.A. Professors I Maggio 56I-10040 Rivalta (TO) Italy

The present paper reports the results of an experimental investigation aimed at comparing aerodynamic perform- ance of three low-pressure turbine cascades for several Reynolds numbers under steady and unsteady inflows. This study is focused on finding design criteria useful to reduce both profile and secondary losses in the aero-engine LP turbine for the different flight conditions. The baseline blade cascade, characterized by a standard aerodynamic loading （Zw=1.03）, has been compared with two Ultra-High-Lift profiles with the same Zweifel number （Zw=1.3 for both cascades）, but different velocity peak positions, leading to front and mid-loaded blade cascade configurations. The aerodynamic flow fields downstream of the cascades have been experimentally in- vestigated for Reynolds numbers in the range 70000〈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 ./＋=0.62 on both profile and secondary flow losses for the three different cascade designs have been studied. Total pressure and velocity distributions have been measured by means of a miniaturized 5-hole probe in a tangential plane downstream of the cascade for both inflow conditions. The analysis of the results allows the evaluation of the aerodynamic performance of the blade cascades in terms of profile and secondary losses and the understanding of the effects of loading distribution and Zweifel number on secondary flows. When operating un- der unsteady inflow, contrarily to the steady case, the mid-loaded cascade has been found to be characterized by the lowest profile and secondary losses, making it the most attractive solution for the design of blades working in real conditions where unsteady inflow effects are present.

关键词： Low-Pressure Turbine Ultra-High-Lift Prof'des Profile losses secondary losses Mid-Loaded Blade Cascades Aft-Loaded Blade Cascades.

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Experimental Investigation of Aerodynamic Characteristic of A High-loaded Working Cascade with Reactance 0.45

Experimental Investigation of Aerodynamic Characteristic of ...

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2010亚太航空航天技术研讨会

作者： Zheng Guanghua~(1*) He Yihong~2 1 Department of Engine and Energy Northwestern Polytechnical University Xi’an 710072 China 2 Chinese Aviation Power Institude(CAPI) Zhuzhou 412002 China

＜正＞Experimental investigation of aerodynamic characteristic of a high-loaded workingcascade with reactance 0.45 is *** are carried out in a wide range of Mach number on the exit（Ma=0.7～1.3）.The flow structure in the blade passage is analyzed and the method to optimize the design of the working cascade is *** of profile losses under subsonic conditions（Ma= 0.7～1.0） is 0.04～*** supersonic conditions（Ma= 1.0～1.3） profile losses sharply increase and reach approximately *** of secondary losses under subsonic conditions is rather high and reaches *** losses under supersonic conditions essentially decrease and obtain *** indicates increase in aerodynamic convergence and reduction in proportion of frictional losses in total losses. To decrease wave losses in the investigated cascade,it is necessary to reduce the value of angle of curvature to 2 /°～3°;increase the value of angle of blade passage to 4°～5°.

关键词： high-loaded aerodynamic characteristic flow structure profile losses secondary losses

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