毛刺和加工精度对涡轮流量影响的数值模拟

Numerical Simulation of the Turbine Mass-Flow Rate by the Affect of Burr and Machining Precision

为了研究喷嘴内壁毛刺和内壁尺寸加工精度对涡轮流量的具体影响,采用数值计算方法对液动涡轮泵喷嘴机构的单喷嘴内部流动进行数值模拟。通过对比计算结果与试验结果,以及分析计算所得流场细节,表明各工况点计算值与试验值的变化趋势基本一致;毛刺和加工精度对涡轮流量都会产生影响,但相对于加工精度,毛刺是影响涡轮流量的主要因素。

In order to study the detailed impact of the burr and the machining precision on turbin mass-flow rate in jet nozzle, numerical computational method is used to simulate the internal flow in singte jet nozzle of the hydraulic operated turbopump, Through comparison of the computational and the experiment results, and the flow area, the results indicate that in each status point, the trend of the calculated and experiment values is substantial consistent. Both burr and machining precision can affect the turbine mass-flow rate. Relative to the machining precision, burr is the major factor in affecting the turbine mass-flow rate.