进口流量对无管式减涡器流阻特性影响研究

Research on Effects of Inlet Flow Rate on Flow Resistance Characteristics of Tubeless Vortex Reducer

关键词:  无管式减涡器  共转盘腔  压力损失系数  去旋角  无量纲质量流量

Key words:  Tubeless vortex reducer  Co-rotating cavity  Pressure loss coefficient  De-swirl angle  Dimensionless mass flow rate

摘要:

为分析进口流量对压气机引气系统无管式减涡器压力损失的影响及无管式减涡器减阻效果，采用数值模拟与试验研究相结合的方法对无管式减涡器开展研究，并与直喷嘴模型进行了对比。模型试验验证了数值模拟方法的可靠性，通过数值模拟，建立了无管式减涡器流阻特性“S”形曲线三分区模型，分析了无管式减涡器各截面间压力损失及其占比随无量纲质量流量变化规律。在计算流量范围内，与直喷嘴模型相比，无管式减涡器平均可降低压气机引气系统压力损失约45.9%。在第二拐点处，共转盘腔内压力损失降低了96.44%，此时无管式减涡器减阻效果最佳，较直喷嘴模型压力损失降低了73.44%。

Abstract:

In order to analyze the effects of inlet flow rate on the pressure loss characteristic of tubeless vortex reducer in compressor air bleed system and the effectiveness of resistance reduction of tubeless vortex reducer, combined numerical simulation and experimental study were promoted to research the tubeless vortex reducer and compared with the straight nozzle model. Model test verified the reliability of numerical simulation method. Tri-partition model of "S" shaped curve flow resistance characteristics of tubeless vortex reducer was established through numerical solutions. The variation of pressure loss and its weight between each section with dimensionless mass flow in tubeless vortex reducer were analyzed. In the mass flow rate range calculated, the tubeless vortex reducer can reduce the pressure loss of the compressor air bleed system by about 45.9% in average compared with the straight nozzle model. The pressure loss in co-rotating cavity was reduced by 96.44% at the second inflection point. Tubeless vortex reducer has the best resistance reduction at this point, which is decreased by about 73.44% compared with the straight nozzle model.