Based on the shear stress transport (SST) turbulence model, the influence of different outlet pipe angles on the head and efficiency of a boiler circulating pump was analyzed. When the outlet pipe angle changed from 115° to 130°, the head and efficiency of the pump reduced significantly. The boiler circulating pump with 115° outlet pipe angle was selected as the further research object, and the reliability of the numerical simulation was verified by experiments. The transient flow of the prototype pump under the design flow rate condition (1.0Q_d) and four other flow rate conditions (0.6Q_d, 0.8Q_d, 1.2Q_d, and 1.4Q_d) was studied. The results show that, under the conditions of design flow and large flow rate (1.0Q_d, 1.2Q_d, and 1.4Q_d), the centrality and regularity of radial force distribution are obviously better than those of small flow rate (0.6Q_d, 0.8Q_d). The leakage of the rear seal ring is less than that of the front seal ring under five flow rate conditions. As the flow rate increases, the leakage of front and rear seal rings decreases, and the leakage ratio of front and rear seal rings increases. The energy loss of the rear cover plate is greater than the energy loss of the front cover plate under five flow rate conditions. With the increase in flow rate, the total loss energy of the prototype pump decreases first and then increases, and the energy loss of the disc becomes larger and larger.

中文翻译：

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基于剪切应力传递湍流模型的锅炉循环泵瞬态流动的数值研究

基于剪切应力传递湍流模型，分析了不同出口管角度对锅炉循环泵扬程和效率的影响。当出口管角度从115°变为130°时，扬程和泵效率显着降低。选择出口管角度为115°的锅炉循环泵作为进一步研究对象，并通过实验验证了数值模拟的可靠性。在设计流量条件（1.0 Q _d）和其他四个流量条件（0.6 Q _d，0.8 Q _d，1.2 Q _d和1.4 Q _d的情况下，原型泵的瞬态流量）进行了研究。结果表明，在设计流量和大流量（1.0 Q _d，1.2 Q _d和1.4 Q _d）条件下，径向力分布的中心性和规律性明显优于小流量（0.6 Q _d）。_d，0.8 Q _d）。在五个流速条件下，后密封圈的泄漏小于前密封圈的泄漏。随着流量的增加，前，后密封环的泄漏减少，前，后密封环的泄漏比率增加。在五个流速条件下，后盖板的能量损失大于前盖板的能量损失。随着流量的增加，原型泵的总损耗能量先减小然后增大，并且盘的能量损耗越来越大。