挡板的相对曲率对分离器入口局域流场流体力学性能的影响
发布时间：2018-09-06 15:04
【摘要】：以立式圆筒体非均相分离器入口处的冲击挡板为研究对象,探究挡板的结构参数——相对曲率K对入口局域流体力学性能的影响。以水为介质,在K=-0.15~0.25范围内,利用计算流体力学三维湍流数值模拟,研究了凹柱面K0、平面K=0和凸柱面K0共3个类型的9种挡板结构入口局域流场的压力和阻力特性,分析了挡板结构对分离器入口受限空间冲击射流的影响机理。结果表明,随着相对曲率的降低,挡板所受冲击力下降,入口局域阻力下降。相对平挡板,K=-0.1的凸柱面挡板局域阻力相对降低2.8%,K=0.1的凹柱面挡板相对提高2.0%。在受限空间内,挡板相对曲率改变了射流冲击间距,影响了入口局域流场结构和静压力分布。凹柱面挡板有效地加长了冲击间距,限制了射流在冲击区轴向和径向扩展。而凸柱面挡板则缩短了冲击间距,有利于射流的扩展。射流冲击区对壁面射流区切向速度分布及挡板出口速度分布起到了决定性作用。
[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.
【作者单位】： 天津大学化工学院;沈阳化工大学辽宁省化工新技术转移推广中心;
【基金】：国家自然科学基金(51506133) 辽宁省自然科学基金(201602595) 辽宁省博士科研启动基金(201601199)项目
【分类号】：O35
，
本文编号：2226720
[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.
【作者单位】： 天津大学化工学院;沈阳化工大学辽宁省化工新技术转移推广中心;
【基金】：国家自然科学基金(51506133) 辽宁省自然科学基金(201602595) 辽宁省博士科研启动基金(201601199)项目
【分类号】：O35
，
本文编号：2226720
本文链接：https://www.wllwen.com/kejilunwen/lxlw/2226720.html
