小尺度孔的流量系数试验  

Experiment of discharge coefficients for small scale cylindrical holes

作　　者：张效伟[1] 朱惠人[1] 张霞[1] 李中洲[1] 

机构地区：[1]西北工业大学动力与能源学院,西安710072

出　　处：《航空动力学报》2010年第11期2479-2485,共7页Journal of Aerospace Power

基　　金：国家重点基础研究发展计划(2007CB707701)

摘　　要：对小尺度孔的流量系数进行了试验研究,并讨论了其流量系数在不同几何和流动参数下的变化规律.小孔直径为0.5,1.0,2.0 mm和3.0 mm;孔间距为5,10和20;长径比为1,2和4;倾斜角为30°,60°和90°;雷诺数Re低于6 000.通过试验可得孔的倾斜角度是影响流量系数的决定性因素之一,孔径对流量系数有显著影响,长径比和孔间距对流量系数均有不同程度的影响.该结果对小尺度孔在叶片气膜或冲击冷却的设计和研究中有重要意义.Discharge coefficients of small scale cylindrical holes were investigated experimentally.And the trend of air discharge coefficient in the condition of various geometry and flow parameters was considered in this paper.Discharge coefficient data were acquired with the diameter of 0.5,1.0,2.0 and 3.0 mm,the ratio of pitch to diameter of 5,10 and 20,the ratio of length to diameter of 1,2 and 4,the inclination angle of 30°,60° and 90°,and the Reynolds number in the range of 0 and 6 000.Moreover,influential factors were discussed.The experimental results show that the inclination angle of holes is one of the critical influential factors,the influence of the diameter of holes on discharge coefficients is distinct and the influences of the ratio of pitch to diameter and the ratio of length to diameter are different.The above results are of important significance in the design and research of small scale holes in film cooling and impingement cooling in the blades or vanes of aero-engines.

关 键 词：小尺度孔 自由射流 流量系数 长径比 倾斜角 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]