喷嘴结构参数对自激脉冲空化射流的影响研究

发布时间：2018-05-15 01:06

本文选题：自激脉冲空化射流 + 喷嘴结构　；参考：《山东大学》2015年硕士论文

【摘要】：自激脉冲空化射流是一种新型高效的射流和作业技术,现被广泛应用在清洗、切割和采掘行业中,特别针对大型油罐的清洗,该射流具有诸多优势。深入对低压大流量自激脉冲空化射流技术的试验及模拟研究对于推进工程实际应用具有非常重要的意义。在总结国内外文献的基础上,对自激脉冲射流、空化射流和自激脉冲空化射流特点和研究现状进行了综述,分析了自激脉冲空化射流研究存在的问题。结合全面试验方法、正交试验方法和均匀试验方法的优缺点,根据论文试验特点,选择正交试验方法设计试验方案。介绍了正交试验方法的性质、特点和试验流程,以及对不同水平数试验进行设计的方法,依据所做试验的因素和水平数目,采用拟水平方法和合适的正交表制定了试验方案。通过自行搭建的试验设备和测试系统,根据试验方案完成试验,利用极差分析处理数据,得出了最佳试验工况和产生脉冲射流的条件。阐述了在最佳工况下,脉冲射流发生机理、周期性现象、结构和运行参数对脉冲射流效果及频率的影响规律,并且对腔内压力波进行了波形和频域分析。针对不同多相流模型,湍流模型和空化模型的优缺点,选择了适合本课题的模型,并对所选模型进行了模拟验证。对试验得出的最佳工况,利用FLUENT软件进行了数值模拟。通过对腔内流场现象变化的描述,得出了流场演变规律,结合试验结果验证了模拟结果的正确性,并且对周期内的流场演变过程进行了机理分析。
[Abstract]:Self-excited pulse cavitation jet is a new and efficient jet and operation technology, which is widely used in cleaning, cutting and mining industries, especially for the cleaning of large oil tanks, the jet has many advantages. The experimental and simulation study of low pressure and large flow rate self-excited pulse cavitation technology is very important for the practical application of propulsion engineering. On the basis of summarizing the literature at home and abroad, the characteristics and research status of self-excited pulse jet, cavitation jet and self-excited pulse cavitation jet are summarized, and the problems existing in the study of self-excited pulse cavitation jet are analyzed. Combined with the advantages and disadvantages of the overall test method, the orthogonal test method and the uniform test method, according to the characteristics of the paper, the orthogonal test method was selected to design the test scheme. This paper introduces the properties, characteristics and test flow of orthogonal test method, and the design method of different level number test. According to the factors and the number of levels of the experiment, the test scheme is established by using the quasi-horizontal method and proper orthogonal table. Through the self-built test equipment and test system, according to the test scheme, using the range analysis to process the data, the optimum test conditions and the conditions for producing the pulse jet are obtained. In this paper, the mechanism, periodicity, structure and operation parameters of pulse jet under the optimum working condition are discussed. The waveform and frequency domain of the pressure wave in the cavity are analyzed. According to the merits and demerits of different multiphase flow models, turbulence models and cavitation models, the models suitable for this topic are selected, and the selected models are simulated and verified. The optimal working conditions are simulated by FLUENT software. Based on the description of the variation of the flow field in the cavity, the evolution law of the flow field is obtained, the correctness of the simulation results is verified by the experimental results, and the mechanism of the evolution process of the flow field in the period is analyzed.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG664

【参考文献】