Engine performance analysis under static uneven tip clearance#br#

Abstract

Abstract: Turbine tip clearance has great influence on engine performance. Borescope inspect image shows that the friction between the leading edges of HPT blade and shroud is severe, and the engine performance keeps low. It is found that the leading and trailing edges of HPT produce uneven expansion deformation under hot state. HPT leading edge grinding angle is adjusted in CFM56 aero -engine under static condition to produce uneven clearance between leading and trailing edges of blade tip position and to carry out the test. 3D turbulence numerical simulation is used to simulate the flow field of HPT and calculate its efficiency as well as thermal efficiency of the whole engine under working state. The key performance parameters are analyzed and the influence of static uneven tip clearance on turbine efficiency and engine performance is studied in combination with maintenance and test data. Result shows that the uneven tip clearance maintenance scheme can reduce the friction of shroud and effectively improve the performance of high-pressure turbine components and the engine.

Key words: uneven tip clearance, HPT, engine performance, numerical simulation

CLC Number:

V263.6

CAO Huiling, WANG Han. Engine performance analysis under static uneven tip clearance#br#[J]. Journal of Civil Aviation University of China, 2020, 38(4): 17-20，36.

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