自激振荡气溶性雾化射流发生机理及其改善研究

发布时间：2018-06-28 09:54

  本文选题：气溶性射流清洗 + 自激振荡　； 参考：《武汉科技大学》2014年硕士论文

【摘要】：针对目前气溶性射流清洗喷嘴的结构特点，本文提出了一种新型自激振荡气溶性射流清洗技术。通过水介质依靠自身动力进行雾化寻找突破，将自激振荡理论应用于水射流的雾化，结合气液两相流理论，，利用自激振荡射流的技术优势，可使清洗设备大大简化，工作可靠性得到进一步提高，而且能够提高清洗效果，极大的节约工业用水资源。本文在深入分析并研究了气溶性射流及自激振荡的发生机理的基础上，对喷嘴结构进行了改善。 首先，从理论上阐述了自激振荡脉冲射流的空化特性及气溶性射流的雾化机理，构建了自激振荡脉冲射流的空化模型以及气溶性射流的气液两相流数学模型。 其次，分析了拉法尔喷嘴的理论设计方法及自激振荡脉冲射流雾化的发生机理，找到了影响雾化性能的重要参数，初步设计出新型气溶性自激振荡脉冲射流雾化喷嘴。 最后，分析了自激振荡腔室内部空化区域特征流场，并进行了数值模拟，根据其对自激振荡脉冲射流雾化的影响，找到了最佳结构参数及其配比，对自激振荡脉冲射流雾化喷嘴的腔室结构进行了优化。
[Abstract]:According to the structural characteristics of the gas-soluble jet cleaning nozzle, a new self-excited oscillating gas-soluble jet cleaning technology is proposed in this paper. The self-excited oscillation theory is applied to the atomization of water jet through the water medium relying on its own power to find a breakthrough. Combined with the gas-liquid two-phase flow theory and the technical advantage of self-excited oscillating jet, the cleaning equipment can be greatly simplified. Working reliability has been further improved, and can improve the cleaning effect, greatly saving industrial water resources. On the basis of deeply analyzing and studying the mechanism of gas-soluble jet and self-excited oscillation, the structure of nozzle is improved. Firstly, the cavitation characteristics of self-excited oscillating pulse jet and the atomization mechanism of gas-soluble jet are described theoretically, and the cavitation model of self-excited oscillating pulse jet and the mathematical model of gas-liquid two-phase flow of gas-soluble jet are constructed. Secondly, the theoretical design method of Rafal nozzle and the mechanism of self-excited oscillation pulse jet atomization are analyzed. The important parameters affecting the atomization performance are found, and a new type of gas-soluble self-excited oscillating pulse jet atomizing nozzle is preliminarily designed. Finally, the characteristic flow field in cavitation region of self-excited oscillation chamber is analyzed, and the numerical simulation is carried out. According to its influence on self-excited oscillation pulse jet atomization, the optimum structure parameters and its proportion are found. The cavity structure of self-excited oscillating pulse jet atomizing nozzle was optimized.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB490;O358

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