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研究了突扩扩压器中前置扩压器各参数与总压损失和静压恢复间的关系。采用实验与FLUENT计算结合的方法,通过水槽PIV实验得出扩压器内的流场信息,对照不同的湍流模型,得出最佳的计算方案。根据此计算方案计算不同的扩张角下前置扩压器性能的变化,得出各参数之间的规律。结果表明雷诺应力模型能够较好地预测扩压器内部流场;前置扩压器扩张角存在一个最佳值,大于最佳值前置扩压器会出现流动分离;结合理论分析和计算数据总结出计算前置扩压器总压损失系数和静压恢复系数的公式,利用此公式还可求出最佳的前置扩张角和前置扩压器长度,计算误差在5%左右。
The relationship between pre-diffuser parameters and total pressure loss and static pressure recovery in sudden expansion diffuser was studied. By combining the experiment with FLUENT calculation, the flow field information in the diffuser is obtained through the PIV experiment of the water tank, and the optimal calculation scheme is obtained by comparing different turbulence models. According to this calculation scheme, the variation of the pre-diffuser performance under different expansion angles is calculated and the law between the parameters is obtained. The results show that the Reynolds stress model can better predict the flow field inside the diffuser. There is an optimal value for the divergence angle of the pre-diffuser, and the flow separation will occur if the pre-diffuser is larger than the optimum value. Combining theoretical analysis and calculation data The formulas for calculating the total pressure loss coefficient and the static pressure recovery coefficient of the pre-diffuser are summed up. The optimal pre-dilatation angle and pre-diffuser length can also be calculated by this formula with the calculation error of about 5%.