离心式透平的变工况特性研究

发布时间：2018-02-21 14:50

本文关键词： 离心透平气动设计数值模拟变工况特性　出处：《工程热物理学报》2016年06期 　论文类型：期刊论文

【摘要】：本文以完全气体为流动工质,进行离心透平级的气动设计与性能研究。采用数值模拟方法,对所设计的离心透平级进行设计工况及变工况条件下的三维稳态流场分析。结果表明:在设计工况下,流道内的流场合理,流线流畅,气动性能符合预期;在变工况条件下,当转速一定,随着背压的降低,流量缓慢增大,效率先缓慢下降,再迅速下降。随着背压的升高,流量和效率都是先缓慢下降,再迅速下降;涡流的出现会导致变工况点的效率的迅速下降;转速增大对流量几乎没有影响,转速增大可使最佳效率点向压比p_2/p_1小的方向移动;转速减少对流量也几乎没有影响,转速减少可使最佳效率点向压比p_2/p_1大的方向移动;进口温度的变化对级效率影响较小,质量流量随进口温度的增大而降低。
[Abstract]:In this paper, the aerodynamic design and performance of centrifugal turbine stage are studied with complete gas as flow medium. The three dimensional steady flow field of the designed centrifugal turbine stage is analyzed under the conditions of design and variable working conditions. The results show that the flow field in the flow channel is reasonable, the flow line is smooth, and the aerodynamic performance is in line with the expectation under the conditions of variable working conditions. When the speed is constant, with the decrease of back pressure, the flow rate increases slowly, the efficiency decreases slowly, and then decreases rapidly. With the increase of back pressure, the flow rate and efficiency decrease slowly first and then rapidly. The appearance of eddy current will lead to a rapid decrease in the efficiency of the off-condition point; the increase of the rotational speed has little effect on the flow rate, and the increase of the rotational speed can make the optimal point of efficiency move in the direction of smaller pressure than the p _ s _ p _ p _ p _ p _ 1, and the decrease of the speed of speed has little effect on the flow rate. The decrease of rotational speed can make the best efficiency point move in the direction of greater pressure than that of P _ 2 / p _ s _ 1, and the change of inlet temperature has little effect on the stage efficiency, and the mass flow rate decreases with the increase of inlet temperature.
【作者单位】：上海理工大学能源与动力工程学院;上海市动力工程多相流动与传热重点实验室;
【基金】：国家自然科学基金(No.51536006;No.51576133) 上海市科委基地建设项目(No.13DZ2260900) 上海理工大学流动控制与仿真重点实验室资助(No.D15013)
【分类号】：TK05

【相似文献】