Structural Parameter Optimization and Working Performance Simulation of Surface Jet Drainage System
The impacts of structural parameters and working parameters of the surface jet drainage system on its working performance are unknown,and the process effect of the system is not significant.Taking a well group in Sichuan as an example,the structural parameters of the gas ejector were preliminarily designed by using the aer-odynamic function method.Then,the internal flow field of the gas ejector was analyzed through numerical simula-tion with the ejector coefficient as the performance index parameter.Furthermore,the structure of the gas ejector was optimized.Finally,the impacts of two parameters(structure size and operating condition)on the ejector coef-ficient and the optimal structure size of the ejector were determined.The results show that under the designed con-ditions,the nozzle outlet chamfer has little impact on the ejection performance,and the nozzle can work well at the chamfer angle of 3.5°～5.5°.The ratio of the nozzle distance to the nozzle throat diameter is 1.5,and the opti-mum diameter ratio between the section of the mixing tube and the nozzle throat is 1.64.In choked(critical flow)state,increasing the ejection pressure can improve the ejection coefficient,but decreasing the outlet pressure can-not elevate the ejection coefficient.In unchoked state,the ejection coefficient can be improved by increasing the working pressure and ejection pressure and decreasing the outlet pressure.The research provides new insights on the effect of surface jet drainage and also valuable basis for optimizing the structural parameters of the ejector.
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