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首页> 外文会议>International conference on nuclear engineering;ICONE17 >RESULTS OF A STEAM-WATER EXPERIMENT SIMULATING TWO-PHASE FLOW IN PRESSURIZER SPRAY PIPING
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RESULTS OF A STEAM-WATER EXPERIMENT SIMULATING TWO-PHASE FLOW IN PRESSURIZER SPRAY PIPING

机译：加压喷雾管道内两相流模拟的蒸汽-水实验结果

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摘要

Pressurizer spray line of PWR plant cools reactor coolant by injecting water into pressurizer. Since the continuous spray flow rate during commercial operation is considered insufficient to fill the pipe completely, there is a concern that a water surface exists in the pipe and may periodically sway. In order to identify the flow regimes in pressurizer spray piping and assess their impact on pipe structure, a two-phase flow experiment under steam-water condition was conducted. In the experiment, temperature fluctuation due to swaying was investigated. With a full-scale mock-up made of stainless steel, two-phase flow of 100°C steam and 60°C water under atmospheric pressure condition was investigated. The experiment revealed continuous temperature fluctuation of 5°C at edge of the water surface. Also, the fluctuation disappeared when concentration of non-condensable gas (Dissolved Oxygen) reached lppm. Even though DO concentration reached minimum of 20ppb and the gas phase could be considered almost 100% steam, no violent motion of the surface was observed which was concerned when steam condensation involved. Water levels and values of steady state heat transfer coefficient were estimated and compared with the values by Dittus Boelter correlation.
机译：PWR工厂的增压器喷淋管线通过将水注入增压器来冷却反应堆冷却剂。由于认为在商业操作期间的连续喷雾流量不足以完全填充管道，因此担心管道中存在水面并且可能会周期性地摇摆。为了确定增压喷雾管道中的流态并评估其对管道结构的影响，在蒸汽-水条件下进行了两相流实验。在实验中，研究了由于摇摆引起的温度波动。使用不锈钢制成的大型模型，研究了在大气压条件下100°C的蒸汽和60°C的水的两相流。实验表明，水面边缘的温度连续波动5°C。另外，当不可冷凝气体（溶解氧）的浓度达到1ppm时，波动消失。即使溶解氧的浓度达到最低20ppb，气相也可以看作几乎100％的蒸汽，但未观察到表面剧烈运动，这涉及到蒸汽凝结。估算水位和稳态传热系数值，并通过Dittus Boelter相关性将其与值进行比较。

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