CAJ | 학술논문

采用煤液化热高分液控阀的实际操作条件、工艺介质和结构特性，基于两相空化流动方程、Lagrangian固体颗粒控制方程和RNG k-ε湍流模型，开展空蚀和磨损的耦合计算。计算结果表明：在阀芯的出口处，由于流速降低导致的分离现象，会出现回流区和空化带；在阀芯和阀座的间隙处，由于局部压力降低至液相的饱和蒸汽压以下，阀芯壁面存在明显的空化区域，易发生空蚀；阀座的近壁面存在高速固体颗粒的团聚现象，易发生磨损。实际失效案例与数值计算的结果基本一致，验证了数值计算的可靠性。
채용매액화열고분액공벌적실제조작조건、공예개질화결구특성，기우량상공화류동방정、Lagrangian고체과립공제방정화RNG k-ε단류모형，개전공식화마손적우합계산。계산결과표명：재벌심적출구처，유우류속강저도치적분리현상，회출현회류구화공화대；재벌심화벌좌적간극처，유우국부압력강저지액상적포화증기압이하，벌심벽면존재명현적공화구역，역발생공식；벌좌적근벽면존재고속고체과립적단취현상，역발생마손。실제실효안례여수치계산적결과기본일치，험증료수치계산적가고성。
According to the actual operating conditions ,process medium and structural properties of hydraulic control valve in coal liquefaction high temperature and pressure separator ,the cavitation-wear coupling calculation was carried out based on the two-phase cavitating flowing equation ,lagrangian solid particles control equation and RNG k -ε turbulence model .The results showed that:the recirculation and cavitation region was formed in the outlet of the valve piston because of the flowing separation induced by the decreasing of flow rate;In the gap between the valve seat and piston ,due to the local pressure is reduced to lower than the saturation vapor pressure of the liquid ,the obvious cavitation region appeared in the wall of the valve piston and the cavi-tation erosion is prone to occur;the wear is also prone to happen for the agglomeration phenomenon of the high speed solid parti -cles near the wall of the valve seat .The actual failure case is basically in accordance with the numerical simulation results ,the re-liability of the calculation is verified .