带后置蜗壳的斜流叶轮机匣处理扩稳研究  

A Study of the Stability Enhancement Achieved by the Casing Treatment of an Oblique-flow Impeller Equipped with a Rear-mounted Volute Housing

作　　者：楚武利[1] 高鹏[1] 吴艳辉[1] 袁森[1] 

机构地区：[1]西北工业大学动力能源学院,陕西西安710072

出　　处：《热能动力工程》2009年第6期725-729,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：针对小型高速斜流叶轮的机匣处理进行了实验研究与数值模拟分析。实验结果表明,所设计的机匣处理结构可以有效地扩大斜流叶轮的工作范围。采用并行计算技术,对包括斜流叶轮机匣处理以及蜗壳在内的整机流场进行了数值模拟,揭示了机匣处理扩稳的机理,机匣处理结构将叶片顶部区域的低能流体抽吸进入处理槽,从叶片通道内吸力面侧区域流出周向槽,射入转子通道,吹除该区域的低能气团阻塞,改善了转子叶片叶顶区域的气流流动状况,推迟失速的发生。Experimentally studied and analyzed through a numerical simulation was the casing treatment of a small-sized high-speed oblique-flow impeller.The test results show that the casing treatment structure being designed can effectively enlarge the operating range of the oblique-flow impeller.By using a parallel calculation technology,numerically simulated was the flow field of the whole machine,including the casing treatment structure and volute housing of the impeller,revealing the mechanism governing the stability enhancement achieved by the casing treatment.The low-energy fluid in the area of the blade tip was sucked into the treatment slot by the casing treatment structure,flowed out of the circumferential slot in the area at the suction surface side inside the blade passage and jetted into the rotor passage,thus eliminating the blockage caused by the low-energy air mass in the area,improving the air flow status at the blade tip of the rotor and delaying stall occurrence.

关 键 词：斜流叶轮 蜗壳 机匣处理 失速 后置蜗壳 周向槽机匣 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]