摘要
对叶轮直径为10 mm的微型透平进行了3种叶轮型线设计,并应用数值模拟进行了分析比较.主要考察3种方案气动性能的优劣,以此研究毫米级微型透平设计时适用的基本型线.在此基础上对设计方案3进行了气动优化设计,研究了提高毫米级微型透平总-静效率的可行方法.结果表明:在3种设计方案中,叶轮叶片中弧线向反旋转方向弯曲的方案3更适于高速运行,具有较高的效率与功率,是最优的设计方案;随着膨胀比增大,毫米级微型透平的余速损失增加,如追求高的总-静效率,需要选取较低的膨胀比;毫米级微型透平的尾管进出口面积比对透平总体性能有较大的影响,在热力设计时不应忽略,尾管进出口面积比在1左右时,透平总-静效率最高.
Three kinds of rotor profiles of a radial inflow millimeter-scale turbine with a rotor diameter of 10 mm were designed and analyzed with numerical simulation. Their aerodynamic performances were compared and a suitable basic profile was selected. Then redesign and optimization of the profile selected were performed to enhance the total-static efficiency. The results indicate that the profile whose camber line turns to the negative rotating direction is the best one and can be adapted to the higher rotational speed with higher shaft power and efficiency. The leaving velocity loss of the millimeter-scale turbine increases with the increase of expansion ratio. The lower expansion ratio should be chosen if the high total-static efficiency is mainly considered in the design process. The ratio of inlet area to exit area of the diffuser has significant influence on the overall performances of millimeter-scale turbines, and the maximum total-static efficiency will be achieved when the area ratio is around 1：1.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2009年第1期15-19,共5页
Journal of Xi'an Jiaotong University
关键词
毫米级微型透平
数值模拟
叶轮型线
millimeter-scale turbine
numerical simulation
rotor profile
