燃气涡轮试验与研究
燃氣渦輪試驗與研究
연기와륜시험여연구
GAS TURBINE EXPERIMENT AND RESEARCH
2014年
5期
5-11
,共7页
轴流压气机%处理机匣%斜沟槽%台阶流动%叶尖泄漏%数值模拟
軸流壓氣機%處理機匣%斜溝槽%檯階流動%葉尖洩漏%數值模擬
축류압기궤%처리궤갑%사구조%태계류동%협첨설루%수치모의
axial compressor%casing treatment%sloped trench%step flow%tip leakage%numerical simulation
采用数值模拟方法，研究了不同沟槽深度和开槽位置的斜沟槽型处理机匣对压气机气动性能的影响。结果表明，叶尖间隙较小时，与光壁机匣相比，机匣处理后压气机堵点流量提高，最大效率基本不变，稳定工作裕度下降；叶尖间隙较大时，机匣处理后压气机最大效率不变，堵点流量、压比和稳定工作裕度提高。适当减小开槽点与转子叶尖前缘距离，可在不损失效率的情况下提高压气机近失速点压比。斜沟槽型处理机匣对流动的影响：一是流通面积增加和斜坡带来的收缩通道作用，有助于缓解叶尖流动堵塞，降低损失；二是机匣突然升高造成后台阶流动分离，造成较大的总压损失和效率下降。
採用數值模擬方法，研究瞭不同溝槽深度和開槽位置的斜溝槽型處理機匣對壓氣機氣動性能的影響。結果錶明，葉尖間隙較小時，與光壁機匣相比，機匣處理後壓氣機堵點流量提高，最大效率基本不變，穩定工作裕度下降；葉尖間隙較大時，機匣處理後壓氣機最大效率不變，堵點流量、壓比和穩定工作裕度提高。適噹減小開槽點與轉子葉尖前緣距離，可在不損失效率的情況下提高壓氣機近失速點壓比。斜溝槽型處理機匣對流動的影響：一是流通麵積增加和斜坡帶來的收縮通道作用，有助于緩解葉尖流動堵塞，降低損失；二是機匣突然升高造成後檯階流動分離，造成較大的總壓損失和效率下降。
채용수치모의방법，연구료불동구조심도화개조위치적사구조형처리궤갑대압기궤기동성능적영향。결과표명，협첨간극교소시，여광벽궤갑상비，궤갑처리후압기궤도점류량제고，최대효솔기본불변，은정공작유도하강；협첨간극교대시，궤갑처리후압기궤최대효솔불변，도점류량、압비화은정공작유도제고。괄당감소개조점여전자협첨전연거리，가재불손실효솔적정황하제고압기궤근실속점압비。사구조형처리궤갑대류동적영향：일시류통면적증가화사파대래적수축통도작용，유조우완해협첨류동도새，강저손실；이시궤갑돌연승고조성후태계류동분리，조성교대적총압손실화효솔하강。
The effects of sloped trench casing treatment on the performance of axial compressor rotor have been studied and flow structure of 10 kinds of different geometrical sloped trench has been simulated. At smaller tip gap, there is an increase in choke flow of the rotor with invariant maximum efficiency and lower stall margin after casing treatment. At larger tip gap, after the sloped trench casing treatment, the flow and total pressure ratio at chock point increased with the invariant maximum efficiency and higher stall margin. The effects of sloped trench casing treatment on flow structure can be divided into two aspects, one is the slope and increased flow area remit the blockage at tip region of the rotor and reduce the loss; the other is the step flow caused by the rising casing forms a zone of fixed flow, bringing a larger loss of total pressure and efficiency.
