本文選題：自激脈沖空化射流 + 噴嘴結(jié)構(gòu)��； 參考：《山東大學(xué)》2015年碩士論文

【摘要】：自激脈沖空化射流是一種新型高效的射流和作業(yè)技術(shù),現(xiàn)被廣泛應(yīng)用在清洗、切割和采掘行業(yè)中,特別針對大型油罐的清洗,該射流具有諸多優(yōu)勢。深入對低壓大流量自激脈沖空化射流技術(shù)的試驗(yàn)及模擬研究對于推進(jìn)工程實(shí)際應(yīng)用具有非常重要的意義。在總結(jié)國內(nèi)外文獻(xiàn)的基礎(chǔ)上,對自激脈沖射流、空化射流和自激脈沖空化射流特點(diǎn)和研究現(xiàn)狀進(jìn)行了綜述,分析了自激脈沖空化射流研究存在的問題。結(jié)合全面試驗(yàn)方法、正交試驗(yàn)方法和均勻試驗(yàn)方法的優(yōu)缺點(diǎn),根據(jù)論文試驗(yàn)特點(diǎn),選擇正交試驗(yàn)方法設(shè)計試驗(yàn)方案。介紹了正交試驗(yàn)方法的性質(zhì)、特點(diǎn)和試驗(yàn)流程,以及對不同水平數(shù)試驗(yàn)進(jìn)行設(shè)計的方法,依據(jù)所做試驗(yàn)的因素和水平數(shù)目,采用擬水平方法和合適的正交表制定了試驗(yàn)方案。通過自行搭建的試驗(yàn)設(shè)備和測試系統(tǒng),根據(jù)試驗(yàn)方案完成試驗(yàn),利用極差分析處理數(shù)據(jù),得出了最佳試驗(yàn)工況和產(chǎn)生脈沖射流的條件。闡述了在最佳工況下,脈沖射流發(fā)生機(jī)理、周期性現(xiàn)象、結(jié)構(gòu)和運(yùn)行參數(shù)對脈沖射流效果及頻率的影響規(guī)律,并且對腔內(nèi)壓力波進(jìn)行了波形和頻域分析。針對不同多相流模型,湍流模型和空化模型的優(yōu)缺點(diǎn),選擇了適合本課題的模型,并對所選模型進(jìn)行了模擬驗(yàn)證。對試驗(yàn)得出的最佳工況,利用FLUENT軟件進(jìn)行了數(shù)值模擬。通過對腔內(nèi)流場現(xiàn)象變化的描述,得出了流場演變規(guī)律,結(jié)合試驗(yàn)結(jié)果驗(yàn)證了模擬結(jié)果的正確性,并且對周期內(nèi)的流場演變過程進(jìn)行了機(jī)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.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG664

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