基于二氧化碳工质的向心透平气动性能研究  

Aerodynamic Analysis on Radial Turbine with Carbon-Dioxide

作　　者：宋怀乐 秦政[1,2] 杨康 SONG Huaile;QIN Zheng;YANG Kang(Shanghai Marine Diesel Engine Research Institute,Shanghai 201203,China;Shanghai MicroPowers Ltd.,Shanghai 201203,China)

机构地区：[1]上海船用柴油机研究所,上海201203 [2]上海齐耀动力技术有限公司,上海201203

出　　处：《热力透平》2019年第3期205-208,212,共5页Thermal Turbine

摘　　要：以实际二氧化碳为工质,通过全三维黏性数值仿真模拟及试验研究的方法,对某闭式布雷顿循环系统的向心透平内部流动特性进行了详细研究。对透平内部10%、50%、90%叶高截面及30%、50%、70%流向截面的流动特性及流动损失进行总结。结果表明,数值仿真结果与试验结果吻和较好。随着叶轮转速不断提高,二氧化碳向心透平的稳定工作范围扩大,流通能力逐步增强。过大的进气攻角会造成动叶吸力面前缘出现流动分离,从而引发主流过膨胀,并沿流向出现逆压梯度。叶顶间隙泄漏流动是造成通道涡旋流动损失及叶片表面径向窜流损失的主要原因。研究成果可为以二氧化碳为工质的向心透平设计及变工况调节提供参考。The internal flow characteristics of radial turbine in a closed Brayton cycle with actual carbon dioxide are studied in detail.The full three-dimensional viscous numerical simulation and experimental study of the radial turbine are carried out.The flow characteristics and losses of different blade height cross sections and different flow direction cross sections in radial turbine are summarized.The results show that the simulation results are in good agreement with the experimental results.The steady working range and flow capacity of the radial turbine increase gradually with the increase of impeller rotating speed.The excessive inlet attack angle will cause the flow separation on the suction surface of the rotor blade,resulting in over-expansion of the main flow and the inverse pressure gradient along the flow direction.Leakage flow in tip clearance is the main cause of eddy current loss and radial cross flow loss.The research results can provide reference for the design and off-design regulation of radial turbine with carbon dioxide used as working fluid.

关 键 词：二氧化碳 向心透平 进气攻角 流动损失 

分 类 号：TK14[动力工程及工程热物理—热能工程]