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为明确前置各种参数的孔板对抑制GSB-80/300型的诱导轮离心泵小流量不稳定特性的影响程度,选择孔板离诱导轮前缘的距离L,孔板的孔径D,孔板的厚度B作为3因素,每个因素各取3水平,制定了L9(3~3)正交数值模拟试验方案。数值模拟试验方案采用雷诺时均N-S控制方程和标准κ-ε湍流模型。通过数值模拟,得到了前置各种参数的孔板下诱导轮离心泵流场的分布情况,得到了较佳的三种参数组合,并揭示了各个因素对流场的影响顺序是:孔板的孔径D,孔板的厚度B,孔板离诱导轮前缘的距离L。在此基础上,对三种较佳参数组合下的孔板进行了全工况点的数值模拟,分别得到了它们的扬程流量特性曲线。通过流场,外特性曲线分析比较,得到了有效抑制GSB-80/300型的诱导轮离心泵小流量不稳定特性的最佳参数组合的孔板。
In order to clarify the degree of influence of orifice plates with various parameters beforehand on restraining the small flow instability characteristics of GSB-80/300 induction wheel centrifugal pump, the distance L from the leading edge of the inducer, the orifice diameter D, Orifice thickness B as a three-factor, each factor of three levels, developed L9 (3 ~ 3) orthogonal numerical simulation program. The numerical simulation test scheme uses the Reynolds-averaged N-S governing equation and the standard κ-ε turbulence model. Through the numerical simulation, the distribution of the flow field of the pre-orifice induced-wheel centrifugal pump with various parameters is obtained, and the better combination of the three parameters is obtained. The influence sequence of each factor on the flow field is as follows: Of the aperture D, the thickness of the orifice B, the distance L from the leading edge of the induction wheel. On the basis of this, the numerical simulation of the full working point of the orifice plate under the three optimal parameters is carried out, and their head flow characteristic curves are respectively obtained. Through the analysis and comparison of the flow field and the external characteristic curve, the best combination of orifice plates is obtained which can effectively restrain the small flow instability of the induced wheel centrifugal pump of GSB-80/300 type.