套筒开孔对双层套筒阀流动特性的影响

为了研究内外层套筒小孔孔径对双层套筒阀流量系数和压降流动特征的影响,采用计算流体动力学方法,建立了稳态可压缩过热蒸汽流动的数值模型.对比分析了全开工况下不同内外层套筒开孔孔径组合模型流量系数和压降流动特性的差别.结果表明:内外层套筒不同孔径对于每层套筒的压降有明显影响,内外层套筒开孔孔径等比例放大对每层套筒压降几乎没有影响.只增大外层套筒孔径时,套筒间隙处流体流速不断增大;内外层套筒孔径等比例放大时,套筒间隙处流速变化波动减小.当双层套筒阀需要小幅度提升流量系数时,可以增大外层套筒开孔孔径;当双层套筒阀需要大幅度提升流量系数时,可以对内外层套筒开孔孔径同时等比例增大.研究结果对于套筒阀套筒开孔孔径的设计具有一定的指导意义.

Effects of sleeve opening on flow characteristics of double-layer sleeve valve

In order to study the influence of the inner and outer sleeve holes diameter on the flow coefficient and pressure drop flow characteristics of the double-layer sleeve valve, the steady numerical model of the double-layer sleeve control valve based on the compressible superheated steam flow is established by suing CFD. The differences of flow coefficient and pressure drop flow characteristics of different inner and outer sleeve hole diameter combination models under full opening condition is compared and analyzed. The research indicates that holes diameters of sleeves have significant influence on the pressure drop of each sleeve. When the holes diameter of the inner and outer sleeves is proportionally enlarged, the pressure drop of each sleeve hardly changes. When only the holes diameter of the outer sleeve is increased, the fluid velocity in the gap between the inner and outer sleeves increases continuously. When the holes diameter of the inner and outer sleeves is proportionally enlarged, the fluctuation of the fluid velocity in the gap between the inner and outer sleeves decreases. When a small increase in the flow coefficient is needed, it can be achieved by increasing the holes opening diameter of the outer sleeve; When a great increase of the flow coefficient is needed, the opening holes diameters of the inner and outer sleeves should be increased proportionally at the same time. The results have a certain valuable guiding significance for the design of the holes diameter in the sleeve valve.