【摘要】：噴嘴結(jié)構(gòu)及射流運動參數(shù)對液體空化流動狀態(tài)有重要影響。基于空化泡潰滅的霧化機理和自激振蕩脈沖噴嘴出口流道空化過程,分析空化效應(yīng)對自激振蕩脈沖射流霧化效果的影響。依據(jù)自激振蕩脈沖霧化噴嘴結(jié)構(gòu),分析射流來流速度和脈動壓力對噴嘴出口流道空化效應(yīng)的影響,提出利用來流雷諾數(shù)和脈動特征值表征噴嘴出口流道空化程度,并根據(jù)自激振蕩脈沖噴嘴有限元分析得到噴嘴出口流道較好空化狀態(tài)的來流雷諾數(shù)和噴嘴腔室長徑比。研究結(jié)果表明:當(dāng)來流雷諾數(shù)在2.14×10~5~3.05×10~5內(nèi)逐漸增大時,自激振蕩脈沖霧化噴嘴出口流道液相體積分?jǐn)?shù)先減小后增大,相應(yīng)的空化程度先增大后減小。雷諾數(shù)在2.44×10~5~2.75×10~5內(nèi)可以使噴嘴出口流道形成較好空化效應(yīng),尤其在2.44×10~5附近時噴嘴出口流道出現(xiàn)最好的空化狀態(tài);脈動特征值與噴嘴出口流道處脈動壓力幅值差成正比,隨著自激振蕩脈沖霧化噴嘴腔室長徑比增大,脈動壓力幅值差值先減小后增大。當(dāng)噴嘴腔室長徑比為0.60~0.70時,噴嘴出口流道空化狀態(tài)較好。計算結(jié)果為自激振蕩脈沖射流霧化噴嘴設(shè)計提供了理論依據(jù)。
[Abstract]:The nozzle structure and jet motion parameters have an important influence on the cavitation flow state of liquid. Based on the atomization mechanism of cavitation bubble collapse and the cavitation process of the exit channel of self-excited oscillating pulse nozzle, the influence of cavitation effect on the atomization effect of self-excited oscillating pulse jet is analyzed. According to the structure of self-excited oscillating pulse atomization nozzle, the influence of jet flow velocity and pulsating pressure on the cavitation effect of nozzle outlet channel is analyzed, and the cavitation degree of nozzle outlet channel is characterized by Reynolds number and pulsating characteristic value. According to the finite element analysis of the self-excited oscillating pulse nozzle, the flow Reynolds number and the ratio of length to diameter of the nozzle chamber in the cavitation state of the nozzle outlet are obtained. The results show that when the flow Reynolds number increases gradually in the range of 2.14 脳 10 ~ (5) ~ 5 ~ 3.05 脳 10 ~ (-5), the liquid phase volume fraction at the outlet of the self-excited oscillating pulse atomizing nozzle decreases first and then increases, and the corresponding cavitation degree increases first and then decreases. When the Reynolds number is 2.44 脳 10 ~ (5) ~ (5) ~ 2.75 脳 10 ~ (5) 脳 10 ~ (-5), the cavitation effect can be formed at the nozzle outlet, especially when the nozzle exit is near 2.44 脳 10 ~ (5), and the pulsation characteristic value is proportional to the pulse pressure amplitude at the nozzle outlet. The amplitude difference of pulsating pressure decreases first and then increases with the increase of the ratio of length to diameter of the chamber of self-excited oscillation pulse atomizing nozzle. When the ratio of length to diameter of nozzle chamber is 0.60 ~ 0.70, the cavitation condition of nozzle outlet is better. The calculated results provide a theoretical basis for the design of self-oscillating pulsed jet atomizing nozzle.
【作者單位】： 武漢科技大學(xué)冶金裝備及其控制教育部重點實驗室;重慶大學(xué)機械工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51405352,51376204)
【分類號】：O358

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