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为了了解充液圆管内喷头运动过程中的气幕生成特性,采用高速摄像技术记录了喷头运动条件下多股燃气汇聚生成气幕过程。在实验基础上,建立了多股燃气射流在受限液体中扩展的三维非稳态数学模型,对实验工况进行了数值分析,气幕顶端扩展位移的计算值与实测值吻合较好。在此基础上,对比分析相同喷射条件下喷头运动与否对水下气幕生成特性的影响,结果表明:喷头运动,抑制了流场回流作用,增强了对气幕前端液体的推动作用,8ms时气幕运动速度由10m/s增大到11m/s;增大了喷头下游流场压力,8ms时运动喷头表面轴向受力增大了18%;降低了气幕顶部中心区域温度,但提高了壁面处温度。
In order to understand the characteristics of air curtain in the process of nozzle in the liquid filled circular tube, the high-speed camera technology was used to record the gas curtain formed by multiple gas gathering under the condition of nozzle movement. Based on the experiment, a three-dimensional unsteady mathematical model of multi-gas jet expanding in confined liquid was established. The numerical analysis of experimental conditions was carried out. The calculated values of the extended displacement at the top of air curtain were in good agreement with the measured values. On the basis of this, the influence of nozzle movement on the formation characteristics of underwater air curtain under the same jetting condition is compared and analyzed. The results show that the nozzle movement restrains the flow backflow and enhances the pushing effect on the liquid front. The velocity of the air curtain increases from 10m / s to 11m / s, the pressure in the downstream of the nozzle increases, and the axial force on the surface of the moving nozzle increases by 18% at 8ms. The temperature in the center of the top of the air curtain is reduced, Increase the wall temperature.