五孔探针的标定技术

一、标定方法采用文献 1]标定七孔探针时所采用的多项式拟合技术。图 1　测量坐标系1.测量坐标系　建立在针头上 (图 1)。流动方向由侧滑角 β和攻角α表示。测角范围限定在 |α|≤ 30°,|β|≤ 30°(最大合角度 |γ|≤ 41°)。该范围基本能满足测量一般旋流流场需要。2 .压力系数及其定义　参照文献 2 ]定压力系数 :Cα=(P4- P1 ) / (P2 - P)　 ,　 Cβ =(P3- P5 ) / (P2 - P)Cpt=(P2 - Pt) / (P2 - P)　 ,　 Cpq =(P2 - P) / (Pt- Ps)式中 :P≡ (P1 + P3+ P4+ P5 ) / 4,Pt是总压 ;Ps是静压 ;Pi 是第 i号孔的压力…

THE CALIBRATION TECHNIQUE OF FIVE-HOLE PROBE

A Calibration technique is developed to make the five-hole probe applicable to both definite and variable Mach numbers.A rake composed of 9 five-hole probe is calibrated.The diamelter of the probe is 2.5mm and the width of the rake is 100mm.The range of yaw angle is from -30° to +30°,so is the range of pitch angle.The minimum calibration Mach number is 0.15 and the maximum is 0.45.The standard deviations of yaw angle and pitch angle of each probe are less than 1.0°.The experimental results shows that this technique is suitable for engineering measurement.