本文選題：閃蒸 + 非均溫��； 參考：《航空動力學(xué)報》2017年05期

【摘要】：為深入揭示液滴在真空環(huán)境下的閃蒸機理,建立了真空閃蒸全過程、非均溫的傳熱傳質(zhì)數(shù)學(xué)模型,獲得了各時刻液滴溫度場及半徑,并能夠追蹤結(jié)冰階段的相變界面位置.通過開展液滴閃蒸的實驗研究,觀察了相變前后液滴的形態(tài)變化,并對數(shù)值模型進行了驗證.基于數(shù)學(xué)模型,研究了液滴初始半徑、初始溫度、真空艙壓力和結(jié)冰過冷度對閃蒸過程的影響規(guī)律.結(jié)果表明:真空艙壓力是影響閃蒸過程的主要因素,且會影響最終平衡溫度;初始半徑主要影響預(yù)冷和凍結(jié)時間,而初始溫度和結(jié)冰過冷度主要只影響預(yù)冷時間.
[Abstract]:In order to reveal the mechanism of droplet flash in vacuum environment, a mathematical model of heat and mass transfer at heterogeneous temperature in the whole process of vacuum flash was established. The temperature field and radius of droplet at every moment were obtained, and the position of phase transition interface in freezing stage could be traced. The morphological changes of droplets before and after phase transition were observed and the numerical model was verified by the experimental study of droplet flash evaporation. Based on the mathematical model, the effects of initial radius, initial temperature, pressure of vacuum chamber and degree of supercooling on the flash process were studied. The results show that the vacuum chamber pressure is the main factor affecting the flash process and the final equilibrium temperature, and the initial radius mainly affects the precooling and freezing time, while the initial temperature and the supercooling degree only affect the precooling time.
【作者單位】： 北京航空航天大學(xué)航空科學(xué)與工程學(xué)院;中國航天科技集團公司西安航天動力研究所液體火箭發(fā)動機技術(shù)重點實驗室;
【分類號】：O552.6
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本文編號：1958739