CAJ | 학술논문

针对压气机叶片结垢后的气动热力性能退化的问题，采用扩展壁面函数的Spalart-Allmaras （S-A ）模型，探索不同程度结垢时压气机气动特性变化机理和热力性能退化规律。研究表明：结垢后，粗糙度增加，叶型改变，耦合激波的干扰影响边界层流动形态，进而影响压气机性能；不同叶高处的参数对结垢的敏感性迥异，其中结垢对叶根和叶顶处产生的气动性能退化影响较大；随着压气机结垢的发展，热力性能呈现出非线性退化的特性。
침대압기궤협편결구후적기동열력성능퇴화적문제，채용확전벽면함수적Spalart-Allmaras （S-A ）모형，탐색불동정도결구시압기궤기동특성변화궤리화열력성능퇴화규률。연구표명：결구후，조조도증가，협형개변，우합격파적간우영향변계층류동형태，진이영향압기궤성능；불동협고처적삼수대결구적민감성형이，기중결구대협근화협정처산생적기동성능퇴화영향교대；수착압기궤결구적발전，열력성능정현출비선성퇴화적특성。
The purpose of this research is to explore both the mechanism of aerodynamic characteristic changes and the degradation regularity of thermodynamic performance of the compressor with various fouling .In order to solve the problem , a numerical analysis is carried out by means of Spalart-Allmaras turbulence model using extended wall function .The result shows that the performance dete-rioration of the compressor is attributed to the flow of boundary layer ,w hich is under the influenceof the roughness and the blade profile of wall as well as the shock-wave/boundary-layer in-teractions . The deterioration of aerodynamic performance appearing in the root and top regions is worse than at the mid-span of blade .With an increase in the falling ,the thermodynamic parameters have a non-linear decreased .