Numerical Investigation on the Influence of Continuous Rotating Backpropagation Pressure Wave On Turbine Performance

Hua Qiu, Xiao Wang, Zhi-peng Cao, Cha Xiong, Xi-tao Chen, Minghao Zhao
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Abstract

Research have shown that the use of a continuous detonation afterburner can improve the propulsion performance of aero engine. However, backpropagation pressure waves (BPW) generated by the pressure gain of detonation will affect the internal flow and performance of turbine. This article simulates BPW through a custom function, and investigates the effects of BPW amplitude, rotation frequency, and propagation mode on turbine performance through three-dimensional simulation. The results show that as the pressure amplitude of the BPW increases, the pressure oscillation at each section of the turbine increases and a local subcritical flow state will appear, leading to the decrease of turbine flow rate and turbine power, as well as an intensification of instantaneous turbine power fluctuations. As the rotation frequency of the BPW increases, the pressure oscillation at each section of the turbine gradually decreases. The flow rate and power of the turbine do not change much, but turbine efficiency gradually decreases. Compared to the aligned mode, the turbine performs better under the influence of BPW in misaligned mode. Compared to the single-wave mode, the fluctuation of transient turbine power is lower under the influence of BPW in the multi-wave mode excluding collision mode. Finally, the constraints of equal flow rate region and equal turbine power line on the peak-to-peak value of the BPW were analyzed when the joint operation of the turbine and compressor was not affected. The rotation frequency and mode of BPW will affect the flow region and power line.
连续旋转反向传播压力波对涡轮机性能影响的数值研究
研究表明,使用连续爆燃后燃器可以提高航空发动机的推进性能。然而,爆燃压力增益产生的反向传播压力波(BPW)会影响涡轮的内部流动和性能。本文通过自定义函数模拟 BPW,并通过三维仿真研究 BPW 振幅、旋转频率和传播方式对涡轮性能的影响。结果表明,随着 BPW 压力幅值的增大,水轮机各断面压力振荡增大,出现局部亚临界流动状态,导致水轮机流量和功率下降,水轮机瞬时功率波动加剧。随着 BPW 旋转频率的增加,水轮机各段的压力振荡逐渐减小。涡轮机的流量和功率变化不大,但涡轮机效率逐渐降低。与对准模式相比,涡轮机在 BPW 的影响下在错位模式下表现更好。与单波模式相比,多波模式(不包括碰撞模式)下 BPW 影响下的涡轮机瞬态功率波动更小。最后,在不影响涡轮机和压缩机联合运行的情况下,分析了等流量区域和等涡轮功率线对 BPW 峰峰值的约束。BPW 的旋转频率和模式会影响流量区域和功率线。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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