本文選題：水力空化　切入點(diǎn)：數(shù)值模擬　出處：《天津科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：空化具體是指在液體中的氣體或者液體的空腔由于外場的作用,發(fā)生震蕩的物理現(xiàn)象,經(jīng)歷空穴形成、發(fā)展、生長、收縮、潰滅的過程。空化這個(gè)現(xiàn)象本身是很復(fù)雜的,流體中的氣泡在潰滅的時(shí)候就會(huì)產(chǎn)生瞬時(shí)的巨大的壓強(qiáng),會(huì)在氣泡周圍產(chǎn)生巨大的能量,此時(shí)流體還會(huì)有高速射流的現(xiàn)象。利用水力空化產(chǎn)生這些巨大的能量,在物理、化學(xué)、水處理等領(lǐng)域都是一個(gè)新的篇章。為了探索和研究多級(jí)孔板水力空化的空化機(jī)理,優(yōu)化多級(jí)孔板水力空化裝置的設(shè)計(jì),尋找最優(yōu)的參數(shù)設(shè)計(jì),為將來多級(jí)孔板水力空化在工業(yè)等領(lǐng)域的應(yīng)用提供理論的依據(jù)。本文采用CFD數(shù)值模擬方法,以單級(jí)孔板水力空化裝置、二級(jí)孔板水力空化裝置、三級(jí)孔板水力空化裝置。其中裝置里面的孔板設(shè)計(jì)有單孔孔板、雙孔孔板、和三孔孔板。整體模擬的前處理軟件選擇使用GAMBIT軟件,中間最為重要的求解計(jì)算和后處理選擇使用FLUENT軟件,通過對(duì)軟件所得結(jié)果后期的分析得到多級(jí)孔板水力空化裝置所需最佳參數(shù)。本文研究多級(jí)孔板水力空化裝置的級(jí)數(shù)和級(jí)與級(jí)的孔板之間的距離的影響。首先進(jìn)行的是單孔孔板研究,將一級(jí)孔板與二級(jí)孔板進(jìn)行對(duì)比,得到當(dāng)孔板級(jí)數(shù)為2的時(shí)候,二級(jí)孔板水力空化要比一級(jí)孔板水力空化程度高,能源利用率也高;在二級(jí)孔板水利空化中,兩孔板距離60mm時(shí),影響微弱,當(dāng)兩板間距為10mm時(shí),整體相當(dāng)于組合結(jié)構(gòu),在30mm時(shí),可以達(dá)到空化較優(yōu)狀態(tài);當(dāng)使用雙孔孔板,選擇孔間距不同的兩塊板。最后得出當(dāng)兩孔之間的間距為8mm的時(shí)候比12mm的空化程度高;當(dāng)時(shí)用三級(jí)孔板水力空化裝置時(shí),空化效果要比二級(jí)空化和一級(jí)空化強(qiáng)度高,作用面積大。
[Abstract]:Cavitation specifically refers to the physical phenomenon of oscillating in the cavity of a gas or liquid in a liquid due to the effect of the external field. It goes through the process of hole formation, development, growth, contraction, collapse. Cavitation itself is very complex. The bubble in the fluid produces a huge instantaneous pressure when it collapses, a huge amount of energy around the bubble, and a high velocity jet, which uses hydraulic cavitation to produce these huge energies, physically and chemically. The field of water treatment is a new chapter. In order to explore and study the mechanism of hydraulic cavitation, optimize the design of hydraulic cavitation device and find the best parameter design. This paper presents a theoretical basis for the application of hydraulic cavitation in industry and other fields in the future. In this paper, the CFD numerical simulation method is used to simulate the hydraulic cavitation of single hole plate, the hydraulic cavitation device of two-stage orifice plate, the hydraulic cavitation device of two-stage orifice plate, and so on. Hydraulic cavitation device for three-stage orifice plate. The hole plate in the device is designed with single hole plate, double hole plate, and three-hole plate. GAMBIT software is used in the preprocessing software of the whole simulation. The most important intermediate solution calculation and post-processing choice is to use FLUENT software, Through the analysis of the results obtained from the software, the optimum parameters of the hydraulic cavitation device for the multistage perforated plate are obtained. The influence of the series of the hydraulic cavitation device and the distance between the stage and the stage is studied in this paper. Is a single-hole plate study, Comparing the first hole plate with the second hole plate, the hydraulic cavitation degree of the second hole plate is higher than that of the first hole plate, and the energy efficiency is also high when the hole plate grade is 2. In the water conservancy cavitation of the second hole plate, the distance between the two orifice plates is 60mm, The influence is weak, when the distance between two plates is 10mm, the whole is equivalent to the composite structure, when 30mm, the cavitation is better; when the double hole plate is used, Two plates with different hole spacing are selected. Finally, when the spacing between the two holes is 8mm, the cavitation degree is higher than that of 12mm. At that time, the cavitation effect is higher than that of the second-order cavitation and first-order cavitation when the hydraulic cavitation device is used with the third-order hole plate. The area of action is large.
【學(xué)位授予單位】：天津科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ021.1

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