端弯控制扩压叶栅角区分离的机制分析  

Mechanism Study on the End-bend Blade Controlling the Corner Separation

作　　者：杜鑫[1] 焦映厚[1] 张龙新[1] 王松涛[1] 

机构地区：[1]哈尔滨工业大学,黑龙江省哈尔滨市150001

出　　处：《中国电机工程学报》2014年第2期309-314,共6页Proceedings of the CSEE

基　　金：国家自然科学基金创新研究群体项目(51121004);黑龙江省博士后项目(LBH-Z11148);国家高技术研究发展计划(863计划)项目(2008AA5A302)~~

摘　　要：为了进一步揭示端弯叶片技术对角区分离流动的控制机制,应用商业软件Numeca对某地面重型燃气轮机压气机末级静叶进行了数值模拟,详细对比分析了采用端弯叶片技术与弯叶片技术后对原型叶栅壁面压力场以及出口总压损失分布的影响。研究结果表明,端弯叶片技术与弯叶片技术均能缓解端部角区分离流动。与弯叶片相比,相同弯角的端弯叶片具有相同的驱动附面层向叶展中部的迁移能力。端弯叶片通过合理地调整弯高与弯角沿流向的变化,有效地控制了端区附面层的发展,因此端弯叶片具有更好的控制角区分离以及降低静叶总压损失的能力。To further elaborate the mechanism behaviors of the end-bend blade controlling the corner separation, commercial software Numeca was employed to simulate the flow in the rear stator of a heavy-duty gas-turbine compressor. The effects of end-bend blade and bowed blade on the distribution of surface pressure coefficient and total pressure loss at the outlet were studied. The results show that, both of those two retrofit methods can alleviate the corner separation; compared with bowed blade, when the bowed angle is given, end-bend blade has the same ability to force the boundary layer to move towards the mid-span. By redistributing the bowed angle and bowed height along the flow direction reasonably, end-bend blade can control the development of boundary layer effectively, and therefore pronounces a much better ability to control corner separation and reduce the total pressure loss.

关 键 词：燃气轮机 压气机 端弯 弯叶片 角区分离 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]