摘要
以离心透平为研究对象,采用完全气体为流动介质,在效率最优的前提下,提出了一种完全径向出气(α_2=90°)的一维气动设计优化方法,并与效率最优、无约束出气的一维气动设计方法进行比较,结果表明:在压比ε~*=0.625,反动度在0～0.5范围内的情况下,无论是否存在余速利用,无约束出气和完全径向出气对应的最佳速比和最佳轮周效率随反动度的变化规律基本一致;在变压比的情况下,该一维气动优化设计方法得到的最佳轮周效率与无约束出气设计方法得到的最佳轮周效率相差不超过0.5%。但是由于约束了α_2=90°,减少了一个设计变量,简化了设计过程。因此可以用该设计方法进行离心透平的优化设计。
The one dimensional aerodynamic design optimization method of centrifuge turbine are proposed in this paper. The working fluid is perfect gas, the flow outlet angle of rotor is limited to 90°, and the design objectives is the highest efficiency in this optimization method. The results show that when the pressure ratio ε＊ is 0.625, and the reaction degree is within the range of 0-0.5, no matter there is leaving velocity loss or not turbine with radial outflow and turbine with unrestrained outflow have the same variation of the optimal speed ratio and the best wheel efficiency with the reaction degree. The best wheel efficiency of turbine with radial outflow and turbine with unrestrained outflow under different pressure ratio are analyzed in this paper and have small difference. The design progress is simplified by constraining α2=90°. Therefore, this design method can be used to optimize the design of centrifugal turbine.
作者
王乃安
谭鑫
黄典贵
WANG Nai-An1,2 ,TAN Xin1,2 ,HUANG Dian-Gui1,2(1. School of Energy and Power Engineering, University of Shanghai for Science and technology, Shanghai 200093, China 2. Shanghai Key laboratory of multiphase flow and heat transfer of power engineering, Shanghai 200093, Chin)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第4期773-780,共8页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51536006)
上海市科委科研计划资助项目(No.17060502300)
上海市科委基地建设资助项目(No.13DZ2260900)
关键词
离心透平
一维设计
径向出气
centrifugal turbine
one dimensional design
radial outflow
