Process Parameters And Performance Analysis Of Supersonic Heat Exchanger With Pressure Gain

Gas-liquid heat exchanger is the fluid mixing machinery pumping low-pressure liquid with high-pressure steam. Two-phase fluid mix and exchange energy in the mixing chamber, then eventually form a single uniform liquid flowing out. It is widely applied in the fields of energy power, petrochemical engineering, metallurgy, light or textile industry, architecture and refrigeration for the advantages of simple structure, no moving parts, low operation costs, easy operation, maintenance as well as its no strict requirements on the pumped medium, which can be toxic, flammable, explosive, corrosive and condensable gas. Particularly at the aspect of heating, it has made a significant part to reduce energy loss, especially in the northern area of our country.In spite of its simple structure, the internal flow field is complicated, including the interaction of shock waves, vortex, viscous interaction, boundary layer and shear layer. Therefore, this paper simulates the internal flow aimed at process parameters and supercharging performance. The main contents are the following:1、Firstly, this paper describes the basic theory and the characteristics of gas-liquid flow, and then find the change law of sonic with pressure, dryness, void ratio and other parameters as well as the influence degree by utilizing mathematical equation. Meanwhile, utilize shock wave equation to describe the supersonic flow, and then find out the variety of thermodynamic parameters before and after shock wave.2、Secondly, according to “the jet” compiled by sioksfyy, establish characteristic equation and design main structure parameters such as nozzle throat, outlet of the nozzle and mixing chamber throat so that get the physical model.3、Apply CFD simulation platform, k-ε turbulence model as well as calculation method to research on the pressurized performance aimed at the working pressure, injecting pressure and injecting temperature, and then get the effects of working and structure parameters on the ejector working performance. The research provides scientific reference basis for the extensive application of supersonic heat exchanger in heating system.