本文關(guān)鍵詞： 空化自激振蕩脈沖射流噴嘴 技術(shù)特性 空化撞擊流 廢水處理　出處：《沈陽工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著工業(yè)化進程的日益加快,工業(yè)領(lǐng)域產(chǎn)生的廢水量隨之增大,研制出一種高效、綠色的廢水處理裝置對避免環(huán)境污染具有重要的意義。課題組前期研發(fā)了一種用于處理有機廢水的空化撞擊流反應器,本課題在前期研究的基礎(chǔ)上,著重研究了其核心部件-空化自激振蕩脈沖射流噴嘴的結(jié)構(gòu)和技術(shù)特性。本文首先介紹了課題的背景和意義,并對國內(nèi)外空化自激振蕩脈沖噴嘴的研究進展情況進行了綜述。在分別剖析了風琴管和亥姆霍茲管噴嘴的結(jié)構(gòu)原理的基礎(chǔ)上,分析了兩者串聯(lián)使用的優(yōu)勢特點,并認為駐波和共振是這兩種噴嘴內(nèi)波的振動產(chǎn)生、傳輸以及放大效應的重要因素,據(jù)此確定了影響噴嘴空化效應的重要指標,為后續(xù)驗證噴嘴特性的試驗奠定了基礎(chǔ)。引入了正交試驗的研究手段,根據(jù)正交試驗原理,設(shè)計出了適合空化自激振蕩脈沖射流噴嘴的正交試驗表,然后采用Solidworks軟件建立了各種噴嘴的物理模型,并利用Fluent軟件按照正交試驗表分別對不同結(jié)構(gòu)尺寸的風琴管和亥姆霍茲管噴嘴進行不同組別的對比模擬試驗,比較各數(shù)據(jù)指標的極差、方差大小,選出性能最好的兩種單噴嘴結(jié)構(gòu);之后將兩種噴嘴串聯(lián),通過改變中間連接管段的直徑和長度獲得不同結(jié)構(gòu)尺寸的噴嘴,按照正交試驗表利用Fluent軟件模擬噴嘴特性,最終選出結(jié)構(gòu)最為合理的串聯(lián)噴嘴。模擬試驗結(jié)果驗證了對空化自激振蕩脈沖射流噴嘴結(jié)構(gòu)和特性的設(shè)想,噴嘴噴出速度達到了67.34 sm/,出口段空化率達到了0.94,壓力能、湍動能強度等技術(shù)特性都得到了極大改善。根據(jù)得到的最佳噴嘴結(jié)構(gòu)尺寸制作了空化自激振蕩脈沖噴嘴,通過頻率測量實驗測量了其擾動的頻率,驗證了推導出的噴嘴固有頻率公式的正確性;通過空化撞擊流-芬頓聯(lián)合降解廢水實驗驗證了混合型空化自激振蕩脈沖射流噴嘴結(jié)構(gòu)優(yōu)化后對提高反應效率的效果。
[Abstract]:With the acceleration of the industrialization process, the amount of waste water produced in the industrial field has increased, and a kind of high efficiency has been developed. Green wastewater treatment device is of great significance to avoid environmental pollution. A cavitation impingement reactor for treating organic wastewater has been developed by the research group. In this paper, the structure and technical characteristics of cavitation self-excited oscillating pulse jet nozzles, which are the core components of the nozzle, are emphatically studied. The background and significance of the subject are introduced in this paper. The research progress of cavitation self-excited oscillating pulse nozzles at home and abroad is reviewed. Based on the analysis of the structure principle of organ tube and Helmholtz tube nozzle, the advantages of the two nozzles in series are analyzed. It is considered that standing wave and resonance are important factors for the vibration generation, transmission and amplification of the internal waves of these two kinds of nozzles, and the important indexes affecting the cavitation effect of the nozzles are determined. The research method of orthogonal test is introduced. According to the principle of orthogonal test, an orthogonal test table suitable for cavitation self-excited oscillating pulse jet nozzle is designed. Then, the physical models of various nozzles are established by using Solidworks software. According to the orthogonal test tables, the comparative simulation tests are carried out on the different groups of organicorgan and Helmholtz nozzles with different structural sizes by using Fluent software. Two kinds of single nozzle structure with the best performance are selected by comparing the difference and variance of each data index, and then two kinds of nozzle are connected in series, and the nozzle of different structure size is obtained by changing the diameter and length of the middle connecting section. According to the orthogonal test table, the characteristics of the nozzle are simulated by Fluent software, and the series nozzle with the most reasonable structure is finally selected. The simulation results verify the assumption of the structure and characteristics of the cavitation self-excited oscillating pulse jet nozzle. The jet velocity of the nozzle reaches 67.34 smm / r, the cavitation rate of the exit reaches 0.94, the pressure energy and the intensity of turbulent kinetic energy are greatly improved, and the cavitation self-excited oscillating pulse nozzles are fabricated according to the optimum nozzle structure size. The frequency of the disturbance is measured by the frequency measurement experiment, and the correctness of the derived natural frequency formula of the nozzle is verified. The experimental results of cavitation impingement flow and Fenton combined degradation of wastewater proved the effect of the structure optimization of the mixed cavitation self-excited oscillating pulsed jet nozzle on improving the reaction efficiency.
【學位授予單位】：沈陽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X703;TQ052

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