端壁翘曲控制横向二次流应用研究  

Study on Application of Transverse Secondary Flow Controlled by Endwall Warping

作　　者：孙忠民[1] 韩万金[2] 

机构地区：[1]哈尔滨汽轮机厂有限责任公司,哈尔滨150046 [2]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《汽轮机技术》2017年第4期273-276,312,共5页Turbine Technology

摘　　要：针对上/下端壁附面层厚度和流道前/后部流动参数变化程度的不同,以叶栅总压损失系数作为判断标准,择优选取了3套6种翘曲端壁,将它们分别应用于大焓降静叶栅。通过与传统圆柱面端壁叶栅相比较,数值研究了大焓降静叶栅上/下端壁均采用翘曲端壁对横向二次流的控制作用。数值结果显示,大焓降叶片上/下端壁的翘曲消弱了附面层与壁面的相互作用,降低了低总压区面积及其对应的涡量。上/下端壁区流动的总压损失分别降低大约22.0%和19.5%,并且对叶展中部的流动损失基本没有影响。In this paper, three sets of the warped endwall profiles were selected on the basis of the boundary layer tlaieknesses on the upper and lower endwalls and the aerodynamic parameters changes at the front and rear parts of the flow channels, which were used to the design of the stator cascade with large enthalpy drop. Through comparing with the flow performance in the cascade of the traditional cylindrical endwalls, it was studied numerically how the warped endwalls were used to the upper and lower endwalls in the large enthalpy drop stator cascade in order to control the transverse secondary flows on the endwalls. The results show that the warping of the uppei＂ and lower endwalls in the large enthalpy drop stator cascade reduces the interactions between the boundary layers and both the blade and endwall surfaces as well as the areas with low total pressure and its corresponding vorticity. The total pressure losses on the upper and lower endwall regions are decreased by about 22.0% and 19.5% respectively, while the flow losses at the middle height of the cascade are not affected.

关 键 词：大焓降静叶栅 翘曲端壁 工程应用 数值研究 

分 类 号：TK263.3[动力工程及工程热物理—动力机械及工程]