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首页> 外文期刊>Journal of Mechanical Science and Technology >A study on flow characteristics and discharge coefficients of safety valve used in LNG/LNG-FPSO ships
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A study on flow characteristics and discharge coefficients of safety valve used in LNG/LNG-FPSO ships

机译：LNG / LNG-FPSO船用安全阀的流量特性和排放系数的研究

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The safety valves used in liquefied natural gas - floating production storage and offloading (LNG-FPSO) ships play an important role in maintaining a fixed pressure by controlling the release of liquefied natural gas (LNG) from pipes in an LNG piping system. Therefore, the discharge coefficient is regarded as the most important parameter influencing the valve performance. In order to satisfy the ship's classification criteria, the discharge coefficient of the safety valve must usually be over 0.8. Despite the importance of a good understanding of the flow phenomena inside the safety valve for the improvement of the discharge coefficient, the successful design of valves depends on experience and experiments in an industrial field. In this study, a computational fluid dynamics (CFD) investigation was carried out with ANSYS-CFX software to observe the flow phenomena inside the valve and to determine the discharge coefficients from changes in the valve lift, which is the distance between the exit of the nozzle and the lower part of the disc plate. The discharge coefficients obtained were also verified through comparison with available experimental data.
机译：液化天然气中使用的安全阀-浮动产品存储和卸载（LNG-FPSO）船通过控制LNG管道系统中管道的液化天然气（LNG）的释放，在维持固定压力方面发挥着重要作用。因此，排放系数被认为是影响阀门性能的最重要参数。为了满足船舶的入级标准，安全阀的排放系数通常必须大于0.8。尽管必须对安全阀内部的流动现象有很好的了解，以提高排放系数，但安全阀的成功设计取决于工业领域的经验和实验。在这项研究中，使用ANSYS-CFX软件进行了计算流体动力学（CFD）研究，以观察阀门内部的流动现象，并根据阀门升程的变化来确定排放系数，即阀门出口之间的距离。喷嘴和圆盘板的下部。通过与可用的实验数据进行比较，还验证了获得的放电系数。

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