本文選題：噴嘴 + 流體力學(xué)　； 參考：《化工學(xué)報》2017年02期

【摘要】：利用Fluent軟件對壓力旋流式噴嘴的內(nèi)外流場進行了數(shù)值模擬,以等效的二維網(wǎng)格模型模擬圓周對稱的三維流動,多相流和湍流模型分別采用VOF和雷諾應(yīng)力模型。在兩種條件下,對噴嘴流場進行模擬:1氣相為空氣,不發(fā)生相間熱質(zhì)傳遞;2氣相為飽和水蒸氣,發(fā)生相間熱質(zhì)傳遞。相變模型采取Fluent中內(nèi)嵌的Lee模型。將數(shù)值模擬結(jié)果同實驗結(jié)果進行對比,并以數(shù)值模擬的數(shù)據(jù)對噴嘴內(nèi)外流場展開分析。模擬結(jié)果顯示,由于液相在噴嘴旋流室內(nèi)的螺旋運動,導(dǎo)致噴嘴內(nèi)部形成"空氣芯",液相速度在噴嘴旋流室與收縮段的連接處變化劇烈;另外,發(fā)生相間熱質(zhì)傳遞條件下,流場的壓力要整體稍低且速度場的速度最大值更大;液膜的傳熱系數(shù)沿液膜流動方向不斷減小;因氣相冷凝使得液膜厚度更大,液膜破碎長度也因蒸氣冷凝而變得更長。
[Abstract]:The internal and external flow field of the pressure swirl nozzle was numerically simulated by fluent software. The equivalent two-dimensional grid model was used to simulate the circular symmetric three-dimensional flow, and the VOF and Reynolds stress models were used to simulate the multiphase flow and turbulence respectively. Under the two conditions, the flow field of the nozzle is simulated in the presence of air, no heat and mass transfer between phases and saturated water vapor, and heat and mass transfer between phases. The phase change model adopts the Lee model embedded in fluent. The numerical simulation results are compared with the experimental results, and the flow field inside and outside the nozzle is analyzed with the numerical simulation data. The simulation results show that due to the spiral movement of liquid phase in the swirl chamber of the nozzle, the "air core" is formed inside the nozzle, and the velocity of the liquid phase changes dramatically at the junction between the swirl chamber and the contraction section of the nozzle. In addition, under the condition of interphase heat and mass transfer, The pressure of the flow field is a little lower and the maximum velocity of the velocity field is larger; the heat transfer coefficient of the liquid film decreases continuously along the flow direction of the liquid film; the thickness of the liquid film is larger because of the gas phase condensation, and the broken length of the film becomes longer because of the vapor condensation.
【作者單位】： 天津大學(xué)化工學(xué)院;天津大學(xué)化學(xué)工程研究所;化學(xué)工程聯(lián)合國家重點實驗室;
【基金】：國家自然科學(xué)基金項目(21676183)~~
【分類號】：TQ021.3

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本文編號：2056606