Experimental study on turbulent jet interacting with surface standing wave
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摘要: 对表面驻波作用下紊动射流运动进行了试验研究。应用多普勒激光测速仪(LDV)进行流速场量测,应用电容式波高仪测量表面波动特性。结果表明,在表面驻波作用下,紊动射流动量主导远区流速的横向变化仍然可以用高斯分布表达,横剖面上流速的等值线图由原来对称于轴心的圆形变形为椭圆形;表面波动增强了紊动射流的扩散能力。Abstract: The mean velocity characteristics of turbulent jet interacting with surface standing wave were studied experimentally.The experiments were performed in a square water tank.The turbulent jet was driven by a constant head water tank, and the surface standing wave was generated by a plunger-type wave maker.The jet nozzle was positioned under the antinode of the standing wave.The wave amplitude was measured with a capacitance wave gage and the data acquisition system.The velocity profiles were measured with a laser doppler velocimeter.Based on the measurements, it was concluded that the generated waves were nearly perfect standing waves, and the results of turbulent jets were well consistent with the published one.The measurement results of turbulent jet interacting with surface standing water wave indicated that the velocity profiles of the turbulent jets in the momentum-dominated far field were still Gaussian, the imposition of the wave oscillations was to deform the jet structure from circular to elliptic, and the wave oscillations enhanced greatly on the jet mixing.
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Keywords:
- surface standing wave /
- turbulent jet /
- movement characteristic /
- experimental study
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