小轴向间隙下直、弯静叶Clocking效应的实验研究  

Experimental Study of the Clocking Effect of Straight and Bowed Stationary Blades at a Small Axial Clearance

作　　者：陆华伟[1] 郭爽[2] 陈浮[2] 王仲奇[2] 

机构地区：[1]大连海事大学轮机学院,辽宁大连116026 [2]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《热能动力工程》2009年第1期41-46,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学重点基金资助项目(50236020);国家自然科学基金资助项目(50646021)

摘　　要：实验研究了采用直、弯静叶的某低速重复级压气机的Clocking效应在小轴向间隙下的变化情况,探讨了Clocking效应在小轴向间隙下影响压气机内部流动状况的机理。结果表明,当动、静叶间轴向间隙减小到原型间隙的67%时,压气机整体效率较原型有所提高,且采用正弯静叶时压气机效率提高的幅度要大于采用直静叶时。综合不同叶型和Clocking效应带来的效率收益,在设计工况下最多提高1.8%～1.9%,最大流量工况下则可达到2.8%。设计工况下最高效率点发生在一级静叶尾迹与二级静叶尾迹相重合时,最低效率则对应于一级静叶尾迹位于二级静叶流道中央时。Experimentally studied was the clocking effect of a low-speed compressor compound stage adopting both straight and bowed stationary blades at a small axial clearance and investigated was the mechanism influencing the flow status inside the compressor under such a clearance. It has been found that when the axial clearance between the rotating and stationary blades decreases to 67 % of the prototype clearance,the overall compressor efficiency will somehow increase compared with that of the prototype. Moreover,the growth margin of the compressor efficiency by using directly-bowed stationary blades exceeds that in the case of using straight ones. The efficiency increase brought about both by using various blade profiles and from the clocking effect can maximally reach 1.8% to 1.9% at the design operating condition while it can be as high as 2.8 % at the maximal flow rate. The maximal efficiency point at the design operating condition occurs when the wake of the first-stage stationary blades coincides with that of the second-stage ones. The lowest efficiency point corre-Sponds with the case when the wake of the first-stage stationary blades is located in the middle of the second-stage station-ary blade passage.

关 键 词：轴向间隙 Clocking效应 正弯静叶 

分 类 号：TK474.8[动力工程及工程热物理—动力机械及工程]