本文選題：油霧　切入點(diǎn)：碰撞凝聚　出處：《東北大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：本課題對(duì)油霧凝聚機(jī)理的研究是通過(guò)凝縮嘴的凝聚效果來(lái)體現(xiàn)的,主要進(jìn)行了理論分析、FLUENT數(shù)值模擬、實(shí)驗(yàn)研究等方面的探索。 本文首先通過(guò)對(duì)油霧顆粒碰壁運(yùn)動(dòng)理論和油霧顆粒之間碰撞凝聚理論進(jìn)行分析,得出影響油霧顆粒凝聚的重要標(biāo)準(zhǔn)是顆粒的韋伯?dāng)?shù),從韋伯?dāng)?shù)的定義可知油霧顆粒的運(yùn)動(dòng)速度是影響韋伯?dāng)?shù)大小的一個(gè)重要參數(shù)。然后通過(guò)FLUENT軟件進(jìn)行仿真模擬油霧顆粒在不同結(jié)構(gòu)凝縮嘴內(nèi)的運(yùn)動(dòng)變化情況；并設(shè)計(jì)搭建試驗(yàn)臺(tái),通過(guò)正交實(shí)驗(yàn)找出影響凝縮嘴凝聚效果的三個(gè)因素的主次順序。通過(guò)以上工作主要得出如下結(jié)論： (1)通過(guò)對(duì)三種不同結(jié)構(gòu)的凝縮嘴進(jìn)行FLUENT數(shù)值模擬,由模擬的粒徑變化圖可知,階梯型凝縮嘴的凝聚效果最好,其次是直角型凝縮嘴,普通型凝縮嘴的凝聚效果要最差；對(duì)比粒徑變化圖,速度場(chǎng)圖和壓力場(chǎng)圖可知,當(dāng)凝縮嘴內(nèi)的孔徑由大突然收縮變小時(shí),其壓力會(huì)急劇減小,油霧顆粒速度增大,而此時(shí)油霧粒徑也會(huì)迅速變大,說(shuō)明油霧顆粒粒徑的變化受油霧顆粒速度的影響比較大。 (2)通過(guò)對(duì)三組正交實(shí)驗(yàn)的數(shù)據(jù)進(jìn)行分析處理,實(shí)驗(yàn)結(jié)果表明,隨著油霧壓力的增大,凝縮嘴的整體凝縮率是在不斷下降的；孔徑因素是影響凝縮嘴凝縮率的最主要因素,孔長(zhǎng)因素隨著油霧壓力的增大其影響作用越來(lái)越小,材料因素是最次要因素；當(dāng)油霧壓力為10KPa時(shí),凝縮嘴的整體凝縮率最高,且此時(shí)三因素的極差值有一個(gè)較好的梯度,便于區(qū)分主次因素,有利于選擇不同類型的凝縮嘴。因此在實(shí)際應(yīng)用中為了獲得較好的凝縮效果,應(yīng)使凝縮嘴入口處的油霧壓力保持在10KPa左右較好。
[Abstract]:In this paper, the condensing mechanism of oil mist is studied through the condensing effect of condensate nozzle, mainly through the theoretical analysis of fluent numerical simulation, experimental research and other aspects of exploration. In this paper, the Weber number of oil mist particles is obtained by analyzing the theory of impingement motion of oil fog particles and the theory of collision condensation between oil fog particles. From the definition of Weber number, it can be seen that the velocity of oil mist particle is an important parameter that affects the size of Weber number. Then the motion change of oil fog particle in condensed mouth with different structure is simulated by FLUENT software, and the test bed is designed and built. The main and secondary order of the three factors affecting the condensing effect of condensate mouth is found by orthogonal experiment. The main conclusions are as follows:. 1) through the FLUENT numerical simulation of three kinds of condensed nozzles with different structures, the result shows that the agglomeration effect of the ladder condenser is the best, the right angle condensate is the second, and the common condenser is the worst. Compared with the particle size change diagram, velocity field diagram and pressure field diagram, it can be seen that when the aperture in the condensing mouth changes from a large sudden shrinkage to a smaller one, the pressure decreases sharply, the oil mist particle velocity increases, and the oil mist particle size increases rapidly. It shows that the variation of oil mist particle size is greatly affected by the oil mist particle velocity. 2) through the analysis and processing of the data of three groups of orthogonal experiments, the experimental results show that with the increase of oil mist pressure, the overall condensation rate of condensate nozzle is decreasing, and the factor of pore diameter is the most important factor affecting the condensing rate of condensate nozzle. With the increase of oil mist pressure, the effect of pore length factor becomes smaller and smaller, and the material factor is the most important factor, when the oil mist pressure is 10 KPA, the condensate rate is the highest, and the difference of the three factors has a good gradient. It is convenient to distinguish primary and secondary factors and to select different types of condenser. In order to obtain better condensing effect, the oil mist pressure at the entrance of condenser should be kept at about 10 KPA in practical application.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH117

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