摘要
从抑制叶片前缘马蹄涡的生成和延缓通道涡冲击叶片吸力面而分离的设想出发,改造叶片根部端区25%叶高叶型,构造出具有叶片前缘壁角和均匀加载的新动叶。应用于某型低雷诺数透平动叶,经CFD分析确认透平级的通流和做功能力未受到影响,但是叶栅下端区(35%叶高)压损失下降7%。基于对叶栅内流动结构的认识,有意识地设计出符合流动控制机理的截面叶型,再经过合理的展向积叠形成三维叶片,是降低叶栅流动损失的有效的准三维设计方法。
The blade section below 25%span is re-contoured at the hub endwall to restrain the formation of the horseshoe vortex at the leading edge and delay separation of the blade suction side due to the passage vortex,.A new rotor blade incorporating a leading fillet and uniform loading is designed.For the turbine at low Reynolds number flow conditions,a CFD validation is carried out to show that the secondary loss is reduced by 7%at the hub endwall(35%span)without additional penalty on through flow rate and shaft power.Based on the understanding of the flow structures in the cascade,the authors envisage to design section profiles that incorporate the above flow control mechanism,and to generate 3D blades through stacking of two-dimensional airfoil section.This is an effective quasi three-dimensional design method to reduce rotor secondary losses.
作者
段浩杰
陈榴
戴韧
Hao-jie Duan;Liu Chen;Ren Dai(Army Military Transportation University;School of Energy and Power Engineering,University of Shanghai for Science and Technology)
出处
《风机技术》
2020年第3期1-6,共6页
Chinese Journal of Turbomachinery
基金
国家自然科学基金资助项目(No.51276116)。
关键词
低雷诺数
前加载
二次流动损失
前缘壁角
通道涡
马蹄涡
Low Reynolds Number
Front Loading
Secondary Flow Loss
Leading Edge Fillet
Passage Vortex
Horseshoe Vortex
