燃气轮机技术
燃氣輪機技術
연기륜궤기술
GAS TURBINE TECHNOLOGY
2015年
2期
15-20,72
,共7页
主流马赫数%气膜冷却%气动损失%数值模拟
主流馬赫數%氣膜冷卻%氣動損失%數值模擬
주류마혁수%기막냉각%기동손실%수치모의
mainstream mach number%film cooling%aerodynamic losses%numerical simulation
本文通过数值模拟的方法研究了主流马赫数对圆柱孔、扇形孔及双射流气膜孔三种不同气膜孔结构冷却效果及气动损失的影响规律。结果表明,主流马赫数增加对圆柱孔和扇形孔的冷却效果影响不大;在较高吹风比条件下双射流气膜孔的冷却效果受主流马赫数的影响较大:在距离气膜孔较近位置气膜冷却效果随马赫数增大显著提高,更远位置气膜冷却效果显著下降。不同气膜孔结构的气动损失在吹风比较小时十分接近,随着吹风比的增大气动损失随之增大,相同吹风比条件下,气动损失随主流马赫数的增加而减小。
本文通過數值模擬的方法研究瞭主流馬赫數對圓柱孔、扇形孔及雙射流氣膜孔三種不同氣膜孔結構冷卻效果及氣動損失的影響規律。結果錶明,主流馬赫數增加對圓柱孔和扇形孔的冷卻效果影響不大;在較高吹風比條件下雙射流氣膜孔的冷卻效果受主流馬赫數的影響較大:在距離氣膜孔較近位置氣膜冷卻效果隨馬赫數增大顯著提高,更遠位置氣膜冷卻效果顯著下降。不同氣膜孔結構的氣動損失在吹風比較小時十分接近,隨著吹風比的增大氣動損失隨之增大,相同吹風比條件下,氣動損失隨主流馬赫數的增加而減小。
본문통과수치모의적방법연구료주류마혁수대원주공、선형공급쌍사류기막공삼충불동기막공결구냉각효과급기동손실적영향규률。결과표명,주류마혁수증가대원주공화선형공적냉각효과영향불대;재교고취풍비조건하쌍사류기막공적냉각효과수주류마혁수적영향교대:재거리기막공교근위치기막냉각효과수마혁수증대현저제고,경원위치기막냉각효과현저하강。불동기막공결구적기동손실재취풍비교소시십분접근,수착취풍비적증대기동손실수지증대,상동취풍비조건하,기동손실수주류마혁수적증가이감소。
Influence of different film cooling configurations on cooling effectiveness and aerodynamic losses of cylindrical hole, fan-shaped hole and double-jet hole has been studied by numerical simulation method.The results indicate that mainstream mach number has little impact on film cooling effectiveness of cylindrical hole and fan-shaped hole.Mach number has a great effect on film cooling ef-fectiveness of double-jet hole with a high blowing ratio:the film cooling effectiveness in the area near the film cooling hole improves sig-nificantly with the increase of mainstream mach number.On the contrary, the film cooling effectiveness in the area further downstream the film cooling hole drops with the increase of mainstream mach number.The aerodynamic losses of different film cooling configura-tions are approximate when blowing ratio is low, and losses would increase with the blowing ratio rising.When the blowing ratio re-mains the same, the aerodynamic losses would drop with the increase of mainstream mach number.