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光纤传输红外脉冲激光在密闭容器内爆炸式汽化液体形成汽化泡促使液体体积急剧膨胀,在喷嘴处形成高速液体射流。利用聚偏氟乙烯(PVDF)针式水听器探测不同激光参数和光纤位置条件下钬激光脉冲诱导高速液体射流的射流压力和汽化效应诱导声波信号,其电信号在示波器上显示并记录,分析射流压力和声波强度与激光脉宽和激光强度的变化关系。实验结果表明激光平均能量为426.3 m J时射流压力与脉宽(494~967μs)呈正相关函数变化关系,声波强度在光纤末端与喷嘴间距d=2 cm和d=4 cm时与脉宽呈负相关函数变化关系,d=6 cm时声波强度随脉宽的增大呈先升后降的变化趋势,在736μs脉宽时声波强度达到最大值1.32 MPa;脉宽为480μs时射流压力和声波强度随激光能量(266.3~420.8 m J)增大而增大;当激光参数恒定时声波信号和射流信号均随d增大而增大。
Optical fiber transmission Infrared pulsed laser Explosive vaporization liquid in sealed container to form vaporization bubble Promote the rapid expansion of liquid volume, forming a high-speed liquid jet at the nozzle. Polyvinylidene fluoride (PVDF) pin hydrophone was used to detect the jet pressure and vaporization induced by high-velocity liquid jet under various laser parameters and optical fiber positions. The electric signal was induced on the oscilloscope and recorded and analyzed Jet pressure and sound intensity and laser pulse width and laser intensity changes. The experimental results show that the jet pressure has a positive correlation with the pulse width (494 ~ 967μs) when the average laser energy is 426.3 mJ. The acoustic intensity is negative with the pulse width when the distance between the fiber tip and the nozzle is d = 2 cm and d = 4 cm The correlation function changes with the increase of the pulse width at d = 6 cm, and the intensity of the wave increases first and then decreases. The maximum intensity of the wave is 1.32 MPa at 736 μs pulse width and the jet pressure and the intensity of the wave at the pulse width of 480 μs With laser energy (266.3 ~ 420.8 m J) increases and increases; when the laser parameters constant acoustic signals and jet signals are increased with increasing d.