Numerical simulation of sonic oscillator

DOI：10.7511/dllgxb200805006

 作者 单位 陈祖志,胡大鹏,陈圣涛,代玉强

音波振荡器的振荡特性和总压损失是影响静止式气波制冷机制冷效率的重要因素，通过数值模拟研究发现二者受元件几何尺寸的影响．计算了不同几何结构尺寸下音波振荡器内的流动，总结了几何因素对射流振荡和总压损失的影响规律，并分析了其内在原因，发现 射流振荡周期只随控制管长成正比例规律变化，不受其他几何因素的影响； 分流劈距在一定区间范围内，射流才能稳定振荡，且振荡区间的上限和下限均随位差的变化而变； 音波振荡器的喷嘴喉部长度、分流劈距、位差及分流劈形状对总压损失有显著影响，控制口宽度、分流劈张角、分流劈尖半径对总压损失也有一定程度的影响．

Oscillation properties and total pressure loss of sonic oscillator have great effect on refrigeration efficiency of static gas wave refrigerator. Effects of geometrical sizes on the oscillation characteristics and total pressure loss of the sonic oscillator are investigated by numerical simulation. Gas flow in sonic oscillator is calculated with different geometrical sizes. The geometrical factors affecting the oscillation properties and the total pressure loss of the gas are summarized, and the causes are also analyzed. Conclusions are drawn as follows: The oscillation cycle of the jet only varies with the controlling tube length and is proportional to it; The jet only oscillates in a certain range of splitter distance, whose upper and lower limit both change with wall offset The total pressure loss of the sonic oscillator is affected remarkably by any of the nozzle throat′s length, the splitter distance, the wall offset and the shape of the splitter tip. The controlling port width, the splitter angle and the radius of splitter tip all have a little effect on the total pressure loss.