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Effect of non-condensible gas on the subcooled water critical flow in a safety valve

机译:不可冷凝气体对安全阀中硫化水临界流动的影响

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The effect of non-condensable gas on the subcooled water critical flow in a safety valve is investigated experimentally at various subcoolings with 3 different disk lifts. To evaluate its effect on the critical pressure ratio and critical flow rate, three parameters are considered: the ratios of outlet pressure to inlet pressure, the subcooling to inlet temperature, and the gas volumetric flow to water volumetric flow are 0.15-0.23, 0.070.12, and 0-0.8, respectively. It turns out that the critical pressure ratio is mainly dependent on the subcooling, and its dependency on the gas fraction and the pressure drop is relatively small. When the ratio of nitrogen gas volumetric flow to water volumetric flow becomes lower than 20%, the subcooled water critical flow rate is decreased about 10 % compare to the water flow rate of without non-condensable gas. However, it maintains a constant value after the ratio of gas volumetric flow to water volumetric flow becomes higher than 20%. The subcooled water critical flow correlation, which considers subcooling, disc lift, backpressure, and noncondensable gas, shows good agreement with the total present experimental data with the root mean square error 8.17%.
机译:通过3种不同的盘升降机实验研究了安全阀中的不可冷凝气体对安全阀中的缩小水临界流量的影响。为了评估其对临界压力比和临界流速的影响,考虑了三个参数:出口压力与入口压力的比率,从进气温度的过冷,以及水量体积流量的气体体积流量为0.15-0.23,0.070。 12和0-0.8分别。事实证明,临界压力比主要取决于过冷,其对气体分数和压降的依赖性相对较小。当氮气体积流量与水体积流量的比率低于20%时,与没有不可冷凝气体的水流速比较减小约10%的大气压水临界流量。然而,在水容量流量的气体体积流量的比率变得高于20%之后,它保持恒定值。将过冷,椎间盘升降机,背压和不可调味的气体进行过冷却水临界流量相关性,与均方根误差8.17%的根均线误差显示出良好的一致性。

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