1915 軸対称脈動水噴流の PIV 計測 : 四象限分類

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This paper describes the turbulent flow characteristics of axisymmetric non-pulsating and pulsating jets measured by PIV (Particle Imaging Velocimetry). The PIV measurement is made for a pulsating jet at an amplitude ratio of 0.25,a Strouhal number St of 0.17,and a Reynolds number of 1070. According to the measured velocities, the fluid motions are classified into four quadrant categories, i.e. ejection, outward interaction, sweep, and inward interaction. The contributions of these classes of motion to frequency are analyzed. The present result at St=0.17 and a dimensionless distance of z^^-=4 is different from the previous one measured at St=7.8×(10)^<-4> and z^^-=20. It is clear that the frequency of ejection is dominant and the frequencies of the inward interaction and the sweep become approximately equal for phases just after passing the maximum velocity.
2000-07-31