涡轮叶片粗糙度对其性能衰退的影响研究

涡轮是航空发动机核心部件之一,对整个发动机性能的发挥产生重大影响。导致航空发动机性能衰退的形式有很多种,其中由积垢沉淀因素造成的叶片粗糙度增大是具有代表性的原因。利用叶型基本数据进行两级涡轮建模,与传统建模方法相比,提高了模型精度。将所有导致涡轮性能衰退的因素都等价为叶片表面粗糙度的变化,并基于等价雷诺数修正原理,通过仿真方法定量研究了涡轮叶片由于积垢沉淀引起粗糙度增大从而导致其性能的衰退情况。仿真结果表明,当涡轮叶片表面粗糙度增大时,两级涡轮主要的特性参数都发生不同程度的减小,使涡轮总体性能下降。

Research on Turbine lamina Roughness Influence on its Performance Declination

The turbine is one of the core aero- engine components, it mostly influences the performance of the engine. There are many factors leading to the aero- engine performance declination, especially roughness increase caused by the lamina fouling is a typical reason. The paper builds 2- stage turbine model by using basic blade profile data, it enhances the model precision compared to the traditional modeling method. The ingredients that lead to the turbine performance declination equal to the change of blade surface roughness. And the paper quantitatively researches the performance declination leaded by the two- stage turbine blade roughness increase by simulation method ,and based on the equivalent Reynolds number modifying theory. The simulation result indicates when the blade surface roughness increases, the main turbine characteristic parameters decrease in some degree, and make the total turbine performance decline.