本文選題：淹沒射流　切入點(diǎn)：磨料　出處：《振動(dòng)與沖擊》2016年19期

【摘要】：基于渦運(yùn)動(dòng)理論,采用固-液兩相大渦模擬方法模擬了淹沒磨料射流的渦量場(chǎng),分析了渦旋擴(kuò)散機(jī)理與卷吸特性以及磨料隨渦運(yùn)動(dòng)在射流中的混合分布規(guī)律。流場(chǎng)剪切層中渦旋呈對(duì)稱分布,沿軸線方向渦量呈指數(shù)衰減,衰減到最小值兩側(cè)渦旋混合成紊流混合區(qū),而等速核內(nèi)渦量幾乎為零。相比于純水射流,磨料的存在使得射流渦運(yùn)動(dòng)減弱,渦旋擴(kuò)散角減小約50%,等速核增長(zhǎng)約30%,減少了能量耗散。磨料在射流束內(nèi)部時(shí),受渦旋影響,趨向分布于高應(yīng)變率、低渦量區(qū),在渦旋下游側(cè)磨料濃度最高。同時(shí)模擬研究了磨料參數(shù)對(duì)渦量場(chǎng)的影響規(guī)律,結(jié)果表明:磨料參數(shù)基本不影響擴(kuò)散角(14.1°~15.1°)、等速核長(zhǎng)度,卷吸能力隨磨料濃度、粒徑、密度的升高均呈現(xiàn)小幅度地降低,磨料密度對(duì)其影響程度最大,磨料粒徑的影響最不明顯。
[Abstract]:Based on the theory of vortex motion, the vorticity field of submerged abrasive jet is simulated by solid-liquid two-phase large eddy simulation method. The vortex diffusion mechanism, entrainment characteristics and the mixing distribution of abrasive with vortex motion in the jet are analyzed.In the shear layer of the flow field, the vortex is symmetrically distributed, and the vorticity is exponentially attenuated along the axis, and the vortex is mixed to the turbulent mixing region at both sides of the minimum value, while the vorticity in the isokinetic nucleus is almost zero.Compared with pure water jet, the existence of abrasive makes the vortex motion weaken, the vortex diffusion angle decrease about 50 and the isokinetic nucleus increase about 30 percent, thus reducing the energy dissipation.Under the influence of vortex, the abrasive tends to distribute in the region of high strain rate and low vorticity, and the abrasive concentration is the highest in the downstream side of vortex.At the same time, the effects of abrasive parameters on vorticity field are simulated. The results show that the abrasive parameters have no effect on diffusion angle 14.1 擄~ 15.1 擄, and the length of isokinetic nucleus and entrainment ability decrease slightly with the increase of abrasive concentration, particle size and density.The effect of abrasive density is the greatest, and the influence of abrasive particle size is the least.
【作者單位】： 重慶大學(xué)煤礦災(zāi)害動(dòng)力學(xué)與控制國家重點(diǎn)實(shí)驗(yàn)室;重慶大學(xué)復(fù)雜煤氣層瓦斯抽采國家地方聯(lián)合工程實(shí)驗(yàn)室;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2014CB239206) 國家自然科學(xué)基金青年基金項(xiàng)目(51404045) 長(zhǎng)江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃(IRT13043)
【分類號(hào)】：O35

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本文編號(hào)：1692041