环周进水汽_液两相喷射性能优化

基于环周进水型汽-液两相喷射器流动机理的分析,研究并发展了一种新的喷射器优化的方法。采用在圆柱段混合室壁面上增加侧向孔的方式,使外界环境的低温水通过侧向孔进入混合室,形成二级引射,从而提高喷射系数。设计了以湿蒸汽为工作蒸汽的实验台和多喷嘴喷射器作为实验元件,湿蒸汽的压力在0.15～0.4 MPa范围内,湿蒸汽干度在0.25～1范围内,实验比较了优化前、后试件的性能,结果表明:在相同的蒸汽干度下,喷射系统实现了阶跃性的增长,且随蒸汽干度的增大,喷射系数提高的幅度增加,验证了采用该优化方法提高喷射性能是可行的。

Optimization of Full-arc Water-admission Steam-liquid Two-phase Jet Flow Performance

On the basis of an analysis of the mechanism governing the flow in a full-arc water admission type steam-liquid two-phase ejector,studied and developed was a new method for optimizing ejectors.By adopting a mode that several holes in the side direction along the wall surface of the mixture chamber in the cylindrical section are additionally provided,the low temperature water in the outside world can be introduced into the said chamber through these holes,forming a second stage ejection and thus enhancing the ejection coefficient.A test rig was designed with wet steam serving as the working steam and a multi-nozzle ejector as the test piece.The pressure of the wet steam ranged from 0.15 MPa to 0.4 Mpa and the dryness of the wet steam was within a range of 0.25-1.During the test,the performance of the test piece before and after the optimizatio was compared,verifying that the optimization method under discussion is feasible.The research results show that at a same steam dryness,the ejector system has realized a stepped increase and with an increase of the steam dryness,the increment of the ejection coefficient will also increase.