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目前,对诱导轮对航空燃油离心泵的性能影响认识不足,针对此问题,设计了等螺距和变螺距两种形式的诱导轮,对其进行数值研究。在数值计算过程中,对采用等螺距诱导轮、变螺距诱导轮和不采用诱导轮三个模型在0.6Q、0.8Q、1.0Q、1.2Q、1.4Q五种工况下进行数值模拟,得到了外特性曲线以及泵内流场速度、压力分布。分析结果表明:在燃油泵主叶轮前添加诱导轮,可以小幅度提升泵扬程,较大程度提高泵的效率,相比于等螺距诱导轮,变螺距诱导轮的改善效果更好;添加诱导轮后,主叶轮入口流动情况得到改善,尤其在大流量工况下,低压区的分布减少,诱导轮对泵内流动的影响主要在叶轮进口处。
At present, the understanding of the influence of inducing wheel on the performance of centrifugal fuel pump is not enough. In view of this problem, two types of inducer with equal pitch and variable pitch are designed and numerically studied. In the process of numerical calculation, numerical simulation was carried out under three conditions of 0.6Q, 0.8Q, 1.0Q, 1.2Q and 1.4Q using three models of equal-pitch inducer, variable-pitch inducer and no inducer, The external characteristic curve and pump flow field velocity, pressure distribution. The analysis results show that adding inducer before the main impeller of the fuel pump can lift the pump head slightly and improve the efficiency of the pump to a great extent. Compared with the equal pitch inducer, the effect of the variable pitch inducer is better; After that, the flow at the inlet of the main impeller is improved. Especially under the conditions of high flow rate, the distribution of the low pressure zone is reduced. The influence of the inducer on the flow in the pump is mainly at the inlet of the impeller.