弯叶片对超声速流动的影响

发布时间：2017-12-26 17:13

本文关键词：弯叶片对超声速流动的影响　出处：《西安交通大学学报》2016年09期 　论文类型：期刊论文

【摘要】：针对弯叶片可以减少激波损失且作用机理不明的问题,对工业汽轮机中跨声速、超声速流动条件下弯叶栅进行了数值研究,分析了弯叶片对流场结构的影响,并为此设计了叶片弯角分别为0°、±5°、±10°、±15°、±20°、±25°的11种正、反弯角静叶方案,弯叶片弯高为50%展向,叶根与叶顶弯角相同。研究结果表明:弯叶片改变了激波结构,这一作用在不同的超声速条件下是相同的;在压比较大、流量较小的条件下,工业汽轮机采用超声速设计是可行的。弯叶片在超声速条件下可以降低叶栅损失,且存在最优值;相对于亚声速流动,超声速动叶吸力面上的损失减小;11种方案下静叶片正弯设计对动叶压力面影响较小,静叶片反弯设计对动叶压力面与吸力面均有较大影响。该结果可为工业汽轮机超声速设计、研究提供参考。
[Abstract]:The curved blade can reduce the shock and loss mechanism is unknown, the industrial steam turbine transonic and supersonic flow are studied under the condition of curved blade, analyzes the influence of curved blade on the flow structure, and to design the blade angle was 0 degrees, plus or minus 5 degrees, plus or minus 10 degrees, plus or minus 15 degrees, plus or minus 20 degrees, plus or minus 25 degrees of the 11 kinds of positive and negative bending angle of stators, curved blade bending high 50% spanwise blade root and leaf angle, Dingwan same. The research results show that the curved blades change the shock wave structure, which is the same under different supersonic conditions. Under the condition of large pressure and small flow rate, it is feasible to adopt supersonic design for industrial steam turbines. The curved blade can reduce the cascade loss at supersonic speed, and there exists an optimum value; compared to the subsonic flow, supersonic blade suction surface on the loss; 11 kinds of scheme design of dynamic static blade positive curving influence leaf surface pressure, anti bending design of vane surface and the suction pressure surface have a greater impact. The results can be used as a reference for the design and research of ultrasonic speed of industrial steam turbine.
【作者单位】：哈尔滨工业大学能源科学与工程学院;
【基金】：国家自然科学基金优秀创新研究群体资助项目(51421063)
【分类号】：TK261
【正文快照】： 在叶轮机械设计中采用高载荷叶片可有效减小部件长度、零件数量、透平质量与成本,相关流动机理与设计方法研究已进行了30多年[1]。一般来说,提高叶片载荷可以通过减少叶片数[2]或增加级载荷[3]来实现。在叶轮机械气动设计中通常叶栅出口马赫数在0.9及以下时定义为亚声速流动,

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