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为研究轮盖空腔内部流场结构,分析轮盖空腔及泄漏流对叶轮的影响,对闭式离心叶轮及其空腔进行了数值模拟计算。结果表明,在设计流量下,与只计算主流道的常规方案相比,加入空腔无泄漏的方案压比基本不变,效率降低了0.82%,加入空腔存在泄漏的方案压比及效率分别降低了3.7%和2.4%。空腔内压力径向平衡,温度高于主流道。轮盖空腔中存在环流,同时空腔中气流和叶轮主流之间又存在环流现象,二者形成独特的双层环流结构。泄漏流会增加叶轮所受总轴向推力,设计流量下存在泄漏时总轴向推力为无泄漏时的3.17倍。
In order to study the flow field structure inside the wheel cap cavity, the influence of the wheel cap cavity and leakage flow on the impeller is analyzed. The closed centrifugal impeller and its cavity are numerically simulated. The results show that under the designed flow rate, compared with the conventional scheme, which only calculates the main flow channel, the pressure ratio of the cavity without leakage is basically the same, the efficiency is reduced by 0.82%, the pressure ratio and the efficiency of the cavity with leakage are added respectively Reduced by 3.7% and 2.4%. Cavity pressure radial balance, the temperature is higher than the mainstream. There is a circulation in the cavity of the wheel cover, meanwhile there is a circulation phenomenon between the airflow in the cavity and the main flow of the impeller. Both of them form a unique double-layer circulation structure. Leakage flow will increase the total axial thrust impeller thrust, the design flow there is a leakage of total axial thrust of 3.17 times when no leakage.