Numerical Study on Steam-Jet Vacuum Pump by Computational Fluid Dynamics Approach pp. 317-342
Authors: (Xiaodong Wang, Jiangliang Dong, Hongjian Lei, Jiyuan Tu, Vacuum and Fluid Engineering Research Centre, School of Mechanical Engineering and Automation, Northeastern University, Shenyang, P.R. China, and others)
Abstract: Steam-jet vacuum pump is one of the important equipments widely used in industry to obtain a vacuum environment for various special techniques. The primary fluid (steam) with high pressure is accelerated through a nozzle to obtain supersonic speed. The supersonic motive steam and secondary fluid mix in mixing chamber with energy and momentum exchanging. A normal shock wave is induced in throat and the flow speed suddenly drops to subsonic value. Further compression is achieved when the mixed stream passes through diffuser. The flow is complicated in the pump due to the transonic flow and difficult to be described by traditional methods. Computational fluid dynamics (CFD) can be used to investigate and predict the complicated flow problems in steam-jet pump.