10kW向心透平内二次流形成机理与损失分析  

Formation Mechanism and Loss Analysis of Secondary Flow in a 10kW Radial Flow Turbine

作　　者：李鹏[1,2] 李奇[1] 李国能 韩旭 韩中合[1,2] LI Peng;LI Qi;LI Guoneng;HAN Xu;HAN Zhonghe(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China;Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,North China Electric Power University,Baoding 071003,Hebei Province,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003 [2]华北电力大学河北省低碳高效发电技术重点实验室,河北保定071003

出　　处：《动力工程学报》2022年第8期722-730,共9页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(52106010);中央高校基本科研业务费专项资金资助项目(2021MS077)。

摘　　要：为有效改善和提升有机工质向心透平的效率和性能,对10 kW向心透平进行热力设计和模拟计算,分析了静叶栅和动叶轮内部各种涡系的形成机理和表现形式,给出了静叶栅不同截面静压利用系数的分布以及动叶内部截面的总压分布。结果表明:静叶栅内存在压力面到吸力面的横向流动,在前缘和尾缘分别存在马蹄涡和尾迹涡,但并未捕捉到通道涡,马蹄涡的压力面分支会在1/2弦长位置到达吸力面;动叶轮中的涡系主要由前缘压力涡、通道涡以及泄漏涡组成,在动叶前缘压力侧轮毂面形成的涡与端部发展起来的通道涡相互交汇,加剧了此处的流动损失;0.6倍动叶叶高截面的流动状况最佳,由于动叶顶部泄漏涡与通道涡的相互掺混,使叶顶附近截面的流线分布较为复杂。In order to effectively improve and enhance the efficiency and performance of the radial flow turbine with organic working medium, the thermodynamic design and simulation calculation of the 10 kW radial flow turbine were carried out, the formation mechanism and manifestation of various vortex systems in the static cascade and the rotor impeller were analyzed, and the distribution of static pressure utilization coefficient in different sections of the static cascade and the total pressure distribution in the internal section of the rotor blade were given. Results show that there is a transverse flow from the pressure surface to the suction surface in the stator blade, horseshoe vortex and wake vortex exist in the leading edge and trailing edge respectively, but the passage vortex is not captured, and the pressure branch of horseshoe vortex reaches the suction surface at 1/2 chord length. The vortex system in the rotor blade is mainly composed of leading edge pressure vortex, passage vortex and leakage vortex. The vortex formed on the hub surface at the pressure side of the leading edge of the rotor intersects with the passage vortex developed at the end, which intensifies the flow loss here. The flow condition at the high section of 0.6-fold rotation cotyledons is the best. Due to the mutual mixing of leakage vortex and passage vortex at the rotor tip, the streamline distribution at the section near the blade tip is complicated.

关 键 词：向心透平 静叶栅 动叶轮 二次流漩涡 数值模拟 

分 类 号：TK14[动力工程及工程热物理—热能工程]