摘要
利用商用CFD软件对某型汽轮滑油泵钻孔喷嘴进行了数值模拟,研究了4种不同背压(0.12 MPa、0.4 MPa、1 MPa、1.6 MPa)条件下钻孔喷嘴内部的流场变化。模拟结果表明:当背压较小时,背压不影响喷嘴内部流场;随着背压的增大,喷嘴内部产生激波,造成激波损失;激波后存在逆压梯度,导致边界层分离,进一步增大流动损失,气动性能恶化;当背压很大时,喷嘴内为亚声速流动,流量迅速减小。
The drill nozzle in the turbine lubricating oil pump is simulated by the CFD. The changes of [low distribution in .fbur different conditions, with backpressure of0.12 MPa, 0.4 MPa, 1 MPa and I. 6 MPa, are studied. The simulation results show that the backpressure will not influence the interior /low distribution when it is＂ low： With the increase of backpressure, shock wave will be produced in the nozzle＂ which causes a loss. The adverse pressure gradient after the shock wave gives rise to the separation of boundao＇ laver which increases the flow loss .The.flow is subsonic in the nozzle when the backpressure is large, and the mass flow decrease rapidly.
作者
薛红军
曾建华
李泓
蔡佐君
XUE Hongjun ZENG Jianhua LI Hong CAI Zuojun(Navy Representative Office at Shanghai No.704 Research Institute, Shanghai 200031, China Shanghai Marine Equipment Research Institute, Shanghai 200031, China Hangzhou Steam Turbine Co., Ltd., Hanzhou 310000, China)
出处
《机电设备》
2017年第4期22-27,共6页
Mechanical and Electrical Equipment
关键词
钻孔喷嘴
背压
激波
数值模拟
drilling nozzle
backpressure
shock wave
numerical simulation
