本文關(guān)鍵詞：基于孔板及射流的水力空化數(shù)值模擬及實(shí)驗(yàn)研究　出處：《中北大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 水力空化 FLUENT 數(shù)值模擬 復(fù)合空化器

【摘要】：空化是很有應(yīng)用價(jià)值的新型水污染治理工藝,跟別的廢水處理方式作對比,其在能效方面具有一定的優(yōu)勢。但目前該技術(shù)尚處于基礎(chǔ)研究階段,規(guī)模化市場應(yīng)用尚需解決一些關(guān)鍵問題。本文主要目的是通過CFD軟件FLUENT來探索空化強(qiáng)化效應(yīng)的機(jī)理和效果,找出作用于空化強(qiáng)化效應(yīng)的本質(zhì)規(guī)律,并以此優(yōu)化空化器的結(jié)構(gòu),提高空化效率。其中空化發(fā)生器是影響水污染治理結(jié)果的關(guān)鍵部分。通過比較多種水力空化發(fā)生器,從而得到空化器的最優(yōu)參數(shù),設(shè)計(jì)出新型的文丘里管和孔板組合的組合空化器。本論文主要研究成果如下:(1)通過與實(shí)驗(yàn)結(jié)果的比較,在FLUENT中,采用標(biāo)準(zhǔn)k-?模型和空化泡動力學(xué)模型對孔板與文丘里管組合的復(fù)合空化器作出的模擬成果與實(shí)驗(yàn)基本吻合,說明了本論文模型選取的合理及算法的普用性。(2)當(dāng)出口壓力不變時(shí),進(jìn)口壓力在0.4MPa以下,提高壓力,空化強(qiáng)度隨之增大,在0.4MPa時(shí)達(dá)到最佳效果;當(dāng)進(jìn)口壓力大于0.4MPa時(shí),升高進(jìn)口壓力反而會降低空化效應(yīng)。(3)溫度也是影響空化效應(yīng)的一個(gè)重要因素,通過模擬與實(shí)驗(yàn)的對比,得出在20℃~40℃時(shí),提高溫度,空化強(qiáng)度逐漸增大,在40℃時(shí)空化效果較好;大于40℃時(shí),隨著溫度上升,空化效應(yīng)隨之降低。(4)模擬結(jié)果表明,流體的粘性會束縛空化效應(yīng),加大流體的粘性,空化效應(yīng)越弱。隨著表面張力的增大,汽含率變化不大,表明表面張力對空化效應(yīng)的作用很小,可以忽略。對最初氣含量的模擬表明,當(dāng)流體中最初氣含量增加到千分位時(shí)(本文是到0.005),空化效應(yīng)隨之增強(qiáng);繼續(xù)增加最初氣含量,空化效應(yīng)則會隨之減小。(5)不同孔板的結(jié)構(gòu)對復(fù)合空化器的空化效應(yīng)有著關(guān)鍵的作用。通過模擬計(jì)算得出22孔環(huán)狀排布的孔板跟文丘里管組合的空化器空化效應(yīng)較好,實(shí)驗(yàn)結(jié)果也表明該孔板與文丘里管組合對苯酚的降解率最高,達(dá)到21.05%,跟實(shí)驗(yàn)結(jié)果一致。
[Abstract]:Cavitation is a new type of water pollution treatment technology has good application value, compared with other wastewater treatment methods, has certain advantages in terms of energy. But the technology is still in the stage of basic research, the scale of market applications still need to solve some key problems. The main objective of this paper is to explore the mechanism and effect of cavitation effect through the CFD software FLUENT, to find out the effect on the nature of the cavitation effect, and to optimize the structure of cavitation, cavitation improve efficiency. The cavitation generator is a key part of the governance effects of the water pollution. Through comparing the hydrodynamic cavitation generator, in order to get the optimal parameters of cavitation, cavitation model combination design of Venturi pipe and orifice plate combination. The main results are as follows: (1) by comparing with the experimental results, in FLUENT, the standard k- model and cavitation bubble dynamic? The simulation results and the experimental composite cavitation mechanics model of pipe combination of orifice plate and Venturi made the basic agreement, the reasonable selection algorithm and model of this paper in general use. (2) when the outlet pressure is constant, the inlet pressure increases the pressure below 0.4MPa, the cavitation intensity increases, to achieve the best effect in the 0.4MPa; when the inlet pressure is greater than 0.4MPa, increasing the inlet pressure will reduce the cavitation effect. (3) the temperature is also an important factor affecting cavitation effect, through the comparison of the simulation and experiment, obtained at 20 DEG ~40 DEG, high temperature, cavitation intensity increases gradually, 40 degrees in the space-time effect good; more than 40 degrees, with the temperature rise, the cavitation effect decreases. (4) the simulation results show that the viscosity of the fluids will bind the cavitation effect, increase the viscosity of fluid, cavitation is weak. With the increase of surface tension, vapor fraction did not change And that is very small, the effect of surface tension on the cavitation effect can be neglected. Simulation of the initial gas content showed that when the initial gas content in the fluid increased to 1000 position (this is 0.005), cavitation effect is enhanced; continue to increase the initial gas content, the cavitation effect will decrease (5). Play a key role in cavitation structure of different orifice plate of composite cavitators. Results calculated by the simulation of 22 hole ring shaped arrangement of the orifice pipe combined with Venturi cavitation effect, the experimental results also show that the orifice plate and the Venturi tube combined degradation rate of phenol reached 21.05%, with the highest. The results are consistent.

【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X703

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本文編號：1400673