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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part E. Journal of Process Mechanical Engineering >Prediction of two-phase flow through a safety relief valve
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Prediction of two-phase flow through a safety relief valve

机译：通过安全溢流阀的两相流量预测

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摘要

Safety relief valves are necessary elements in any pressurised system. The flow inside the safety relief valve shows a number of interesting, yet complicated, features especially when a two-phase flow is involved. Consequently, developing an efficient and accurate means for predicting the safety relief valve performance and understanding the flow physics is a demanding objective. In this article, the ability of a two-phase mixture model to predict the critical flows of air and water through a safety valve is examined. An industrial refrigeration safety relief valve of 1/4" inlet bore size has been tested experimentally over a pressure range of 6-15 barg and air mass qualities from 0.23 to 1 when discharging to near atmospheric conditions for a range of valve lift positions. A two-dimensional mixture model consisting of mixture mass, momentum and energy equations, combined with a liquid mass equation and the standard k-e turbulence model for mixture turbulent transport has been used to predict the two-phase flows though the valve. The mixture model results have been compared with the homogenous equilibrium model and the homogenous non-equilibrium model adopted by the ISO standard. It has been shown that the mixture model can be used satisfactorily to predict the mass flows for the above conditions. Overall, the accuracy of the two-phase air mass flow for given inlet liquid flow rates can be predicted to within 15%.
机译：安全泄压阀是任何增压系统中必不可少的元素。安全溢流阀内部的流量显示出许多有趣但复杂的特征，尤其是在涉及两相流时。因此，开发一种有效且准确的手段来预测安全释放阀的性能并了解流场物理是一个苛刻的目标。在本文中，检验了两相混合物模型预测通过安全阀的空气和水的临界流量的能力。当排放到一系列阀升程位置的接近大气条件时，已经在6-15 barg的压力范围和0.23至1的空气质量下对入口孔尺寸为1/4“的工业制冷安全泄压阀进行了实验测试。由混合物质量，动量和能量方程组成的二维混合物模型，结合液体质量方程和用于混合气湍流传输的标准ke湍流模型，用于预测流经阀门的两相流。与ISO标准采用的均质平衡模型和均质非平衡模型进行了比较，结果表明，混合模型可令人满意地预测上述条件下的质量流量。对于给定的入口液体流速，相空气质量流量可以预计在15％以内。

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