【摘要】：以立式圓筒體非均相分離器入口處的沖擊擋板為研究對(duì)象,探究擋板的結(jié)構(gòu)參數(shù)——相對(duì)曲率K對(duì)入口局域流體力學(xué)性能的影響。以水為介質(zhì),在K=-0.15~0.25范圍內(nèi),利用計(jì)算流體力學(xué)三維湍流數(shù)值模擬,研究了凹柱面K0、平面K=0和凸柱面K0共3個(gè)類型的9種擋板結(jié)構(gòu)入口局域流場(chǎng)的壓力和阻力特性,分析了擋板結(jié)構(gòu)對(duì)分離器入口受限空間沖擊射流的影響機(jī)理。結(jié)果表明,隨著相對(duì)曲率的降低,擋板所受沖擊力下降,入口局域阻力下降。相對(duì)平擋板,K=-0.1的凸柱面擋板局域阻力相對(duì)降低2.8%,K=0.1的凹柱面擋板相對(duì)提高2.0%。在受限空間內(nèi),擋板相對(duì)曲率改變了射流沖擊間距,影響了入口局域流場(chǎng)結(jié)構(gòu)和靜壓力分布。凹柱面擋板有效地加長(zhǎng)了沖擊間距,限制了射流在沖擊區(qū)軸向和徑向擴(kuò)展。而凸柱面擋板則縮短了沖擊間距,有利于射流的擴(kuò)展。射流沖擊區(qū)對(duì)壁面射流區(qū)切向速度分布及擋板出口速度分布起到了決定性作用。
[Abstract]:Taking the impact baffle at the entrance of the vertical cylinder as the research object, the influence of the structural parameter of the baffle, relative curvature K, on the local hydrodynamic properties of the inlet is investigated. Using water as medium, the pressure and drag characteristics of the local flow field at the entrance of nine types of concave cylinder K _ 0, plane K _ 0 and convex cylinder K _ 0 are studied by means of numerical simulation of three-dimensional turbulent flow in the range of K _ (-0.15) ~ (0.25) in computational fluid dynamics (CFD). The influence mechanism of baffle structure on impinging jet in confined space at the inlet of separator is analyzed. The results show that with the decrease of relative curvature, the impact force of the baffle decreases and the local resistance of the inlet decreases. The local resistance of the convex cylindrical baffle is relatively reduced by 2.8% and the concave cylinder baffle of K _ (0.1) is increased by 2.0%. In the confined space, the relative curvature of the baffle changes the jet impingement spacing, which influences the structure of the local flow field and the static pressure distribution at the entrance. The concave cylindrical baffle effectively lengthens the impact spacing and limits the axial and radial expansion of the jet in the impact zone. The convex cylindrical baffle shortens the impingement spacing, which is beneficial to the expansion of the jet. The jet impingement zone plays a decisive role in the distribution of tangential velocity and the velocity distribution of baffle outlet.
【作者單位】： 天津大學(xué)化工學(xué)院;沈陽(yáng)化工大學(xué)遼寧省化工新技術(shù)轉(zhuǎn)移推廣中心;
【基金】：國(guó)家自然科學(xué)基金(51506133) 遼寧省自然科學(xué)基金(201602595) 遼寧省博士科研啟動(dòng)基金(201601199)項(xiàng)目
【分類號(hào)】：O35
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本文編號(hào)：2226720