Research On The Properties Of Velocity-field In Hyperthermia Vapor Boosting Pump Based On Three-dimension Dynamic Mesh

High temperature and pressure steam is used widely in engineering, such asfood puffing、tobacco production etc. As the main source of high temperature andpressure steam, vapor boosting pump plays a very important role in engineering. Butso far, compared with abroad in the field of developing vapor pump, less work hasbeen done in domestic. General existing domestic vapor pumps have deficienciessuch as inadequate output pressure、lack of running stability and so on.This paper is aimed at doing some work on the CAE simulation of vapor pumpin developing phase, namely the process of digital prototype simulation. Startingwith vapor CFD analysis, this paper solved flow field distribution of vapor mediumwhen pump was running, such as velocity field、temperature field etc, then providedfoundational simulation reference for analysing the performance of key parts invapor pump using fluid-solid interaction method. This paper first did some properdesign optimization on the cylinder assembly of an existing vapor pump ofpiston-type; modeled3D parts of it and assembled using grand engineeringsoftware—Unigraphics which integrates CAD/CAM/CAE function into one body;then transferred the model to Workbench which is the latest-developed platform byANSYS, integrating modules such as Fluent、ICEM CFD and so on to do thepreprocessing. After that, ran Fluent from inside of Workbench. During flow fieldanalysis, in order to simulate the real working environment of vapor pump moreaccurately, this paper introduced conjugate heat transfer、varying boundary conditionand dynamic mesh to CFD analysis of vapor medium, adopting the methodcombining steady and transient anslysis; when simulating the open and close ofvalves in Fluent, instead of applying Remeshing to3D dynamic mesh, this paperadopted a kind of compromising method, namely Layering dynamic mesh plus defining events, simulating valve motion by changing the boundary condition ofvalve port rather than UDF control. In this way, avoided the negative volumeproblem in3D dynamic mesh and to some extent, realized the balance betweensolution accuracy and computing cost.In conclusion, after successful simulation to flow field, this paper could providesome new reference for the digital prototype simulation experiment of vapor pumpduring the developing phase as well as useful theoretic basis for later trial-productionand continual optimization after serial production.