核聚变与等离子体物理
覈聚變與等離子體物理
핵취변여등리자체물리
NUCLEAR FUSION AND PLASMA PHYSICS
2013年
4期
366-373
,共8页
王学德%赵小虎%王路成%路加武%林亚明
王學德%趙小虎%王路成%路加武%林亞明
왕학덕%조소호%왕로성%로가무%림아명
等离子体气动激励%压气机%叶栅%冲击波%角区
等離子體氣動激勵%壓氣機%葉柵%遲擊波%角區
등리자체기동격려%압기궤%협책%충격파%각구
Plasma aerodynamic actuation%Compressor%Cascade%Shock wave%Corner
为揭示纳秒脉冲等离子体气动激励特性及其抑制高负荷压气机叶栅流动分离的作用效果与影响规律，利用PIV流场测试、高速纹影和压力测试开展实验研究。结果表明，纳秒脉冲等离子体气动激励诱导出垂直向上的冲击流动，冲击波的持续时间为80μs左右；纳秒脉冲激励能够有效抑制高负荷压气机叶栅流动分离，其流动控制效果随激励电压和下表面电极宽度的增大以及电极形状改变为弯曲电极而提高，可最大降低总压损失8.4%；激励频率是叶栅等离子体流动控制效果的重要影响因素，端壁横向激励的最佳激励频率为4.0kHz；吸力面流向激励主要改善中间叶高流动特性，而抑制角区流动分离的能力较弱；端壁横向激励通过抑制横向流动，较大程度上减弱了低能流体在角区的积聚，抑制角区流动分离能力较强；组合激励结合了吸力面流向激励和端壁横向激励的作用优势，因而流动控制效果最好。
為揭示納秒脈遲等離子體氣動激勵特性及其抑製高負荷壓氣機葉柵流動分離的作用效果與影響規律，利用PIV流場測試、高速紋影和壓力測試開展實驗研究。結果錶明，納秒脈遲等離子體氣動激勵誘導齣垂直嚮上的遲擊流動，遲擊波的持續時間為80μs左右；納秒脈遲激勵能夠有效抑製高負荷壓氣機葉柵流動分離，其流動控製效果隨激勵電壓和下錶麵電極寬度的增大以及電極形狀改變為彎麯電極而提高，可最大降低總壓損失8.4%；激勵頻率是葉柵等離子體流動控製效果的重要影響因素，耑壁橫嚮激勵的最佳激勵頻率為4.0kHz；吸力麵流嚮激勵主要改善中間葉高流動特性，而抑製角區流動分離的能力較弱；耑壁橫嚮激勵通過抑製橫嚮流動，較大程度上減弱瞭低能流體在角區的積聚，抑製角區流動分離能力較彊；組閤激勵結閤瞭吸力麵流嚮激勵和耑壁橫嚮激勵的作用優勢，因而流動控製效果最好。
위게시납초맥충등리자체기동격려특성급기억제고부하압기궤협책류동분리적작용효과여영향규률，이용PIV류장측시、고속문영화압력측시개전실험연구。결과표명，납초맥충등리자체기동격려유도출수직향상적충격류동，충격파적지속시간위80μs좌우；납초맥충격려능구유효억제고부하압기궤협책류동분리，기류동공제효과수격려전압화하표면전겁관도적증대이급전겁형상개변위만곡전겁이제고，가최대강저총압손실8.4%；격려빈솔시협책등리자체류동공제효과적중요영향인소，단벽횡향격려적최가격려빈솔위4.0kHz；흡력면류향격려주요개선중간협고류동특성，이억제각구류동분리적능력교약；단벽횡향격려통과억제횡향류동，교대정도상감약료저능류체재각구적적취，억제각구류동분리능력교강；조합격려결합료흡력면류향격려화단벽횡향격려적작용우세，인이류동공제효과최호。
To discover the characteristic of nanosecond pulsed plasma aerodynamic actuation (PAA) as well as the effect and influence law of flow separation control on a highly loaded compressor cascade by PAA, experimental investigations of PIV measurements, high-speed Schlieren visualization and pressure measurements were conducted. Results show that a shock wave is induced by nanosecond pulsed PAA to spread outward and can last only about 80μs. Nanosecond pulsed PAA can effectively prevent the flow separation in a highly loaded compressor cascade, and the control effect enhances with the increase of lower electrode width and actuation discharge as well as the shape of curved electrodes. The relative reduction of pitch-averaged total pressure loss coefficient is up to 8.4%. The actuation frequency is one key factor affecting the control effect of nanosecond pulsed PAA, and the optimal actuation frequency is 4kHz. The streamwise PAA on the suction surface can mainly change the flow characteristic at midspan, but has weak impact on corner separation. The pitchwise PAA on the endwall can reduce the accumulation of low-energy fluids at the suction surface and endwall corner by inhibiting the cross flow. The control effect of streamwise PAA on the suction surface combined with pitchwise PAA on the endwall is the best.
