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首页> 外文期刊>Advances in Mechanical Engineering >Numerical Analysis of Flow Phenomena in a Residual Heat Removal Pump:
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Numerical Analysis of Flow Phenomena in a Residual Heat Removal Pump:

机译：余热排出泵中流动现象的数值分析：

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摘要

The hydraulic performances as well as the cavitation phenomena in a scaled residual heat removal pump were investigated by experimental and numerical methods, respectively. In particular, a 3D numerical model of cavitation was adopted to simulate the internal cavitating flow through the model pump. The hydraulic performances of the model pump predicted by numerical simulations were in good agreement with the corresponding experimental data. The main generation and evolution of attached cavitation throughout the blade channels at different cavitating conditions have been investigated using the vapor fraction ISO surface and in-plane velocity vectors. Results show that the low static pressure at the impeller inlet is the main reason for leading edge cavitation by correlation analysis of static pressure on the midspan of impeller. Cavitation proved to occur over a wide range of flow rates, producing a characteristic creeping shape of the head-drop curve and developing in the form of nonaxisymmetric cavities ...
机译：分别通过实验和数值方法研究了比例式余热去除泵的水力性能和气蚀现象。特别是，采用了3D空化数值模型来模拟通过模型泵的内部空化流。通过数值模拟预测的模型泵的水力性能与相应的实验数据非常吻合。使用蒸气分数ISO表面和平面内速度矢量研究了在不同空化条件下整个叶片通道内附着空化的主要产生和演化。结果表明，通过对叶轮中跨静压的相关分析，叶轮入口处的静压低是前缘气蚀的主要原因。事实证明，气蚀会在很宽的流量范围内发生，产生压降曲线的特征性蠕变形状，并以非轴对称腔的形式发展。

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