摘要
为提升斜流风机的气动性能,对斜流风机采用了倾斜导叶设计,并利用流体径向压力梯度对其壁面流体堆积的改善作用进行理论分析。对5种不同倾斜角度的斜流风机导叶进行了数值模拟研究,获得了斜流风机内部流场和气动性能曲线。并依据径向速度和轴向速度分布特征,从流体流通性和能量损失的角度分析了流场结构随导叶倾斜角度的变化规律,验证了理论分析结果。研究结果表明:导叶倾斜引起的径向速度值越接近于0、分布越均匀,且端壁区轴向速度越高、低速区覆盖面积越小,越有利于提升斜流风机气动性能;导叶前倾可提升斜流风机全流量区间(0~1400 m^(3)/h)的全压,其中,前倾20°时在设计工况(1200 m^(3)/s)下提升全压效率约2%;后倾导叶作用相反。研究结果对于风机叶片改型设计的气动性能改善方法具有较好的指导意义。
To promote the aerodynamic performance of diagonal flow fan,the leaned stator was used for its design,and the improvement effect of the radial pressure gradient on wall fluid accumulation was analyzed theoretically.The numerical simulation of fans with five stators of different leaned angles was carried out,and the internal flow field structure and aerodynamic performance curve of the diagonal flow fan was obtained.According to the distribution characteristics of radial velocity and axial velocity,the variation law of flow field structure with the leaned angle of the stator was analyzed from the perspective of the fluidity of fluid and energy loss,the theoretical analysis results were verified.The results show that the closer the radial velocity is to 0,the more uniform the distribution is,and the higher the axial velocity in the end wall area and the smaller the low-speed area is,and the more conducive to improving the aerodynamic performance of diagonal flow fan;The forward leaned stators can increase the total pressure in the full flow range(0~1400 m^(3)/h)of the diagonal flow fan,among which the forward leaned stator with 20°can increase the total pressure efficiency by about 2%under the design working condition(1200 m^(3)/s);However the backward leaned stators has the opposite effect.The research results have good guiding significance for the aerodynamic performance improvement method of fan blade modification design.
作者
韩洁婷
李诗徉
张宇
叶豪杰
吴大转
HAN Jieting;LI Shiyang;ZHANG Yu;YE Haojie;WU Dazhuan(College of Energy Engineering,Zhejiang University,Hangzhou 310013,China;Zhejiang Gongxing Zhixin Technology Co.,Ltd.,Hangzhou 310012,China;Ocean College,Zhejiang University,Zhoushan 316021,China;The State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,Hangzhou 310013,China)
出处
《流体机械》
CSCD
北大核心
2021年第12期26-34,共9页
Fluid Machinery
基金
浙江省重点研发计划项目(2019C01147)。
关键词
斜流风机
倾斜导叶
气动性能
计算流体力学
diagonal flow fan
leaned stator
aerodynamic performance
computational fluid dynamics
