不同过流面积大流量液控单向阀反向开启特性研究

摘要

In order to improve the dynamic characteristics for large-flow pilot-operated check valve , the flow field of large-flow pi-lot-operated check valve was analyzed using fluid dynamics analysis method .The variation instance of pressure and liquid phase was in-vestigated in operation of the large-impact-flow valve.At last, the dynamic characteristics and power spectrum of large-flow pilot-opera-ted check valve were analyzed by experiments .The results indicate that in reverse opening of the check valve , the greater the flow-area is, the shorter the unloading time , and the faster the flow rise , and the lower the cavitation index are .But the flow capacity is strongest when flow-area is of 31.2 mm2 , and the rule of pressure fluctuation is not a linear decreasing .%为了改善大流量液控单向阀的动态特性，采用流体动力学分析方法对大流量液控单向阀进行流场分析，研究了大流量阀工作时流道内流体的压力、液体相的变化情况。实验分析了大流量液控单向阀的动态特性和功率谱，结果表明：在大流量液控单向阀反向开启的过程中，过流面积越大，卸载时间越短，流量上升越快，空化指数越低。但过流面积31.2 mm2时通流能力最强，且压力波动并不呈线性降低的规律。