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首页> 外文期刊>Chemical Engineering Science >Two-phase flow through pressure safety valves. Experimental investigation and model prediction
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Two-phase flow through pressure safety valves. Experimental investigation and model prediction

机译：两相流经压力安全阀。实验研究和模型预测

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Due to the lack of experimental data regarding two-phase flow through safety relief valves, a number of different calculation methods are presently available in the literature for their sizing. All these models mainly refer to the flow through an ideal nozzle, so that, in order to match the measured values, a discharge coefficient is to be introduced in the calculation, the coefficient thus depending on the model adopted. Furthermore, most of the available data are referred to a few operating conditions. As a result, none of the available models is presently considered sufficiently accurate to be used in a wide range of operating conditions.In the present paper, new data are produced on a steam/water flashing system through a real valve with different values of the main operating parameters (vapour quality, inlet pressure, mass flow rate, and backpressure). The measurements are compared with the predictions of a commonly used homogeneous equilibrium model (HEM), the so-called omega method, and show that the model markedly underestimates the mass flow rate in the whole range of conditions investigated. This unexpectedly implies the introduction of a two-phase discharge coefficient much higher than the vapour coefficient.Finally, a new correlation for the discharge coefficient as a function of the main operating parameters is proposed. (c) 2005 Elsevier Ltd. All rights reserved.
机译：由于缺乏有关通过安全阀的两相流的实验数据，目前在文献中可获得许多不同的计算方法来确定其尺寸。所有这些模型主要涉及通过理想喷嘴的流量，因此，为了与测量值匹配，在计算中要引入排放系数，该系数因此取决于所采用的模型。此外，大多数可用数据都涉及一些操作条件。因此，目前尚无可用的模型被认为足够准确，无法在广泛的工作条件下使用。在本文中，通过实际阀门在蒸汽/水闪蒸系统上产生的新数据具有不同的数值。主要操作参数（蒸汽质量，入口压力，质量流量和背压）。将该测量结果与常用的均质平衡模型（HEM）的预测（即所谓的Ω方法）进行比较，结果表明该模型在所研究的整个条件范围内均明显低估了质量流量。这出乎意料地意味着引入了比蒸气系数高得多的两相放电系数。最后，提出了与主要工作参数有关的放电系数的新的相关性。 （c）2005 Elsevier Ltd.保留所有权利。

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