Structural Improvement And Performance Increase Of Small-scale Steam Ejection Experimental System

With the growing tension in the global energy,the development and utilization of industrial waste heat and solar heat source equipment is particularly important,water vapor jet pump is one of the representatives.Although the steam jet pump has many advantages,but its disadvantages are also huge that is the work efficiency is low,this also limits the wide use of water vapor jet pumps,so raising the steam jet pump performance has become the primary task.In recent years the water vapor jet core component of steam pump in the simulation and analysis for numerical injection to get attention,the effect of structure parameters on the performance of ejector has been done a lot of work,but the experimental data in the literature is very limited.This makes the reliability and applicability of the numerical method for theoretical model of injection the lack of experimental data support.Thus,it has greatly restricted the application of numerical simulation.Therefore,in order to in-depth study and understand master ejector performance,and for numerical simulation provide experimental support,necessary to design and construct water steam injection system test platform,on the basis of the jet pump performance to do more research and optimization improved experimental system to obtain more reliable experimental data.The main research work of this paper is as follows:(1)Improvement of the existing water vapor injection experiment system.Mainly for the diffuser structure parameters,modify the parameters and improve the structure,improve the performance of the ejector.(2)The design of the diffuser and its accessories for processing and purchase.(3)By changing injection device operating parameters(steam pressure,evaporating pressure and jet regulator outlet pressure),different operation parameters lead shot of steam mass flow rate,ejecting coefficient curve and critical back pressure.The error analysis of the experimental results is carried out.(4)In experiment system,the main injector is based on the modeling,using ANSYS fluent 14.5,numerical simulation of the jet flow field,expansion under the different parameters of the pressure device wall pressure distribution,ejecting coefficient curve,shock wave position and critical back pressure.The experimental data and numerical simulation results were compared,analyzed and discussed the accuracy of numerical simulation.At the same time,the improvement of the ejector is suggested by using the simulation results.The research work in this paper shows that in a certain pressure range,with the rise of steam pressure,the shot of steam mass flow will gradually increase,ejector critical back pressure will be increased;in a certain pressure range,lead shot of steam mass flow rate increases with the ejector steam pressure rise high.In a certain size range,with diffuser throat diameter of expansion,ejector cited injection coefficient increases.