摘要
为调控平面扩压叶栅流场品质、使测量结果满足二维性,在叶栅端壁增加附面层抽吸装置。采用试验校核的数值方法,分析了不同抽吸位置、不同抽吸流量、不同冲角时端壁附面层抽吸对平面扩压叶栅出口气流角、轴向密流比和总压损失系数等参数的影响。结果表明:在抽吸位置上,位于叶片中前部的抽吸方案对扩压叶栅流场品质的改善效果相对最好。随抽吸流量增加,流场品质进一步改善,抽吸流量为原型进口流量的3%可使冲角为0°时的轴向密流比降低至0.995,主流区出口气流角偏差小于0.1°;抽吸流量为原型进口流量的2.25%可使计算冲角范围内轴向密流比均降低至1.05以下,主流区出口气流角偏差小于0.2°。冲角在-5°,-3°和0°时端壁抽吸使50%相对叶高位置处平均总压损失降低,冲角在2°,4°时使50%相对叶高位置处平均总压损失增加,损失冲角特性更接近理想二维叶栅。
In order to control the flow field quality of planar compressor cascade and make measurement results meet two-dimensional characteristics,the boundary layer suction device was added on the cascade end wall.The influence of the end wall boundary layer suction on the outlet flow angle,axial velocity density ratio and total pressure loss coefficient of the planar compressor cascade at different suction positions,different suction flow rates and different incidence angles was analyzed by using the numerical method of experimental verification.The results show that at the suction position,the suction scheme located in the middle and front of the blade has the relatively best effect on the improvement of flow field quality of compressor cascade.With the increase of suction flow rate,the flow field quality is further improved.The suction flow rate is 3% of prototype inlet flow,which can make the axial velocity density ratio decrease to 0.995 and the deviation of the outlet flow angle at mainstream area be less than 0.1°when the incidence angle is 0°.The suction flow rate is 2.25% of prototype inlet flow,which can make the axial velocity density ratio decrease to less than 1.05 in the range of calculated incidence angle and the deviation of outlet flow angle at mainstream area be less than 0.2°.When the incidence angle is-5°,-3°and 0°,the average total pressure loss at 50% of relative blade height is reduced by the end wall suction.When the incidence angle is 2°and 4°,the average total pressure loss at 50% of relative blade height is increased by the end wall suction,and the loss incidence angle characteristics are closer to the ideal two-dimensional cascade.
作者
李聪
江达林
韩吉昂
徐文峰
LI Cong;JIANG Da-lin;HAN Ji-ang;XU Wen-feng(College of Naval Architecture and Ocean Engineering,Dalian Maritime University,Dalian,China,Post Code:116026)
出处
《热能动力工程》
CAS
CSCD
北大核心
2021年第12期14-23,共10页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金(51406022,51436002)。
关键词
扩压叶栅
端壁附面层抽吸
流场品质
数值模拟
compressor cascade
end wall boundary layer suction
flow field quality
numerical simulation
