七孔探针测量剪切流场的误差分析和实验验证  

Experimental research and error analysis on seven-hole probe measurements of shearing flow field

作　　者：马兴宇[1] 明晓[1] 

机构地区：[1]南京航空航天大学空气动力学系,江苏南京210016

出　　处：《空气动力学学报》2012年第1期57-62,67,共7页Acta Aerodynamica Sinica

基　　金：国家973项目资助(2007CB714600)

摘　　要：有限直径的七孔探针在测量剪切流场时,会引入系统误差。本文通过数值模拟的方法,建立三维七孔探针模型,研究了平行流场的速度梯度、七孔探针直径、滚转角等因素对测量结果的影响,并进行误差分析。在实验中,本文选用典型的平行剪切流场———圆管射流———验证误差分析的结果。通过七孔探针测量剪切流场的实验,确定七孔探针对于剪切流场的空间分辨率。提出了七孔探针的"临界直径"的概念,并且绘制了误差随速度梯度和探针直径变化的曲面示意图,用以选择合适尺寸的七孔探针。Finite diameters of seven-hole probes will bring systematic errors in the measurement in shearing flow.In this paper,the calibra-tion of the coefficient matrix of the three-dimensional seven-hole probe in steady flow field is carried out by numerical simulation.It is studied that several factors,such as velocity gradient,probe diameter and roll angle,cause systematic error in the measure-ment of parallel shearing flow field by numerical simulation.In the experiment of seven-hole probe measurement of the shearing flow field,it is determined the spatial resolution of the seven-hole probe in shearing flow fields.＂Critical diameter＂ is defined and the error distribution of seven-hole probes is established in this paper in the measurement of shearing flow fields under the allow-ance of error.

关 键 词：七孔探针 测量 数值模拟 剪切流场 误差分析 临界直径 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程]