等离子体激励频率对压气机扩稳效果的影响

Effect of Plasma Exciting Frequency on Compressor Stable Operating Range Improvement

为考察放电频率对压气机扩稳效果的影响,实验研究了定常等离子体激励和非定常等离子体激励的扩稳效果。实验在单转子轴流压气机实验台上进行。压气机转速为900r/min时,采用激励电压峰峰值为14.8kV、功率为180W定常等离子体激励可以获得1.1%的扩稳效果。压气机转速提高至1 200r/min,采用定常等离子体激励无法实现扩稳,而采用非定常等离子体激励可以获得近2%的扩稳效果,且功耗为36W。可见相较定常激励,非定常激励的扩稳效果好且功耗低。通过分析电压波形,发现目前使用的非定常等离子体激励电源输出电压波动较大,这样易于发生爬电,限制了等离子体流动控制的效果,因此还需要进一步改进等离子体电源以获得更规则的电压波形。

To investigate the effect of discharge frequency on compressor stability, the stable operating range improvement by steady/unsteady plasma exciting is experimentally investigated. Experiments are carried out on a low speed axial compressor with a single rotor. With steady plasma exciting of 16.8 kV and 180 W, the compressor stability range expanded by 1.1% at rotor speed of 900 r/min. Increasing the rotor speed to 1 200 r/rain, steady plasma exciting failed to expand its stability range. In contrast, the compressor stability range expanded by 20% with unsteady plasma exciting, of which the power consumption was 36 W. So it can be concluded that ,compared with steady plasma exciting, unsteady plasma exciting performs better at expanding compressor stability range with less power consumption. The analysis on voltage waveform shows that, the voltage output of present power source used for unsteady exciting is not stable, which results in easily generating creepage and consequently limits the flow control ability of plasma. The power source needs to be improved to get better voltage waveform output.