结构因素对氦氙混合向心蜗壳性能的影响  

Influence of Structural Factors on the Performance of He-Xe Mixture Gas Volute

作　　者：原泽 郑群[1] 王力国 岳国强[1] YUAN Ze;ZHENG Qun;WANG Liguo;YUE Guoqiang(College of Power&Energy Engineering,Harbin Engineering University,Harbin 150001;Beijing Power Machinery Research Institute of CASIC,Beijing 100074)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,哈尔滨150001 [2]中国航天科工集团北京动力机械研究所,北京100074

出　　处：《机械工程学报》2021年第6期192-199,共8页Journal of Mechanical Engineering

基　　金：上海空间推进研究所创新基金(17DZ2280800);中央高校基本科研业务费专项基金(3072020CF03022020)资助项目。

摘　　要：向心蜗壳的损失特性及其与下游工作轮的匹配能力受到结构参数的影响。针对某型氦氙径流涡轮圆形截面蜗壳,基于相同流动条件及工质等熵膨胀能力等相似准则,比较了三种不同尺寸、出口宽度的蜗壳在不同截面张角情况下的流动特性,通过减小蜗壳盘管尺寸能够适当的提高工作轮的进口马赫数,提高做功能力。分析喉部尾缘损失在收缩段不同位置的发展,在向下游流动的过程中,喉部尾迹与周向气流的动量交换使得角度偏差和速度亏损逐渐减小。利用截面角90°≥θ≥30°内蜗壳出口角的变化范围定义了蜗壳与径流涡轮的匹配能力。结果表明,出口气流角对出口宽度和截面张角的变化更敏感。通过改变出口宽度和调整截面张角,可以使蜗壳出口角更容易与工作轮进口角相匹配。The loss characteristics and its ability to match with the downstream impeller of the volute are affected by its geometric parameters.For the circular section volute of a He-Xe radial turbine,the flow performance is compared between three different sizes and outlet width volutes under the different section angle,which is based on the similarity criterion of the same flow boundary conditions and isentropic expansion capacity of the working fluid.The impeller inlet Mach number increases with an appropriately reduced volute outlet width,which will benefit the turbine output power.The development of the throat trailing edge loss at different positions in the contraction section is analysed.The momentum exchange between throat wake and circumferential flow reduces the angle deviation and velocity loss gradually.The volute capacity to match with the impeller is defined by the variation range of the outlet angle in the case that the section angle ranged from 30°to 90°.The results showed the outlet angle is sensitive to the variation of the outlet width and section angle.By changing the outlet width and adjusting the section angle,the outlet angle of the volute can be more easily matched with the impeller inlet.

关 键 词：径流蜗壳 氦氙 截面张角 几何特征 喉部尾迹 

分 类 号：TK474[动力工程及工程热物理—动力机械及工程]