D0I:10.13374/.issn1001-053x.2012.04.020 第34卷第4期 北京科技大学学报 Vol.34 No.4 2012年4月 Journal of University of Science and Technology Beijing Apr.2012 狭缝射流冲击柱状凸形表面流动换热特性 柳翠翠”姜泽毅》四张欣欣”马强》孙雨生) 1)北京科技大学机械工程学院，北京1000832)中国航空规划建设发展有限公司，北京102206 ☒通信作者，E-mail:zyjiang(@ustb.cdu.cn 摘要采用数值方法研究了狭缝射流冲击柱状凸形表面的流动换热特性，通过四种湍流模型计算结果与实验数据对比，确 定了湍流模型适用性.以压力梯度分布为依据，重点分析了狭缝射流沿柱状凸形表面的流动结构和边界层分离特点及柱状凸 形表面的强化换热特性.结果表明：RNG一e和Realizable k一e模型具有预测适应性：狭缝射流冲击至柱状凸形表面，气体沿 表面运动，速度降低，并在流动下游发生边界层分离；量纲一的逆压梯度随量纲一的曲率半径(D/B)的减小而增大，使得边界 层分离更早出现：驻点区域换热Nu随量纲一的曲率半径(D/B)的减小而获得增强，但流动进入下游后，D/B对换热基本无影 响：压力梯度是影响狭缝射流冲击柱状凸形表面换热分布的重要因素 关键词狭缝射流：凸形表面：湍流模型：边界层：换热 分类号TK124 Flow and heat transfer characteristics of slot jet impingement to a cylindrical convex surface LIU Cui-eui',JIANG Ze-yi"☒，ZHANG Xin-xin,MA Qiang》,SUN Yu-sheng 1)School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)China Aviation Planning and Construction Development Co.Ltd.,Beijing 102206,China Corresponding author,E-mail:zyjiang@ustb.edu.cn ABSTRACT The flow and heat transfer characteristics of slot jet impingement to a cylindrical convex surface were investigated by the numerical method.Suitable turbulence models were determined by comparing experimental data with the numerical results of four turbu- lence models.The flow structure,boundary layer separation and wall heat transfer enhancement characteristics of slot jet impingement to a cylindrical convex surface were discussed on the basis of the pressure gradient distribution.The results show that RNG and Realizable models are suitable to predict.The slot jet impinges to a cylindrical convex surface,the gas flows along the convex surface,the velocity decreases and the boundary layer separation appears downstream.The dimensionless adverse pressure gradient increases with the dimensionless radius of curvature (D/B)decreasing,leading to an earlier boundary layer separation.Nu in the stag- nation region can be enhanced by decreasing D/B.However D/B has almost no effect on heat transfer in the downstream flow.The pressure gradient is a key factor in affecting the heat transfer distribution in slot jet impingement to a cylindrical convex surface. KEY WORDS slot jet impingement;convex surfaces:turbulence models:boundary layers:heat transfer 随着工业生产效率和运行安全性需求的增加， 近年来，研究者采用实验手段开展了狭缝射流 射流冲击至柱状凸形表面的应用日见广泛，如液态 冲击柱状凸形表面的流动换热研究，获得了R、量 气体柱状容器的强制换热和火电转子等轴类工件的纲一的曲率半径（一般为被冲击凸形表面直径与狭 喷气冷却.射流冲击至柱状凸形表面时，由于弧度 缝宽度之比，即D/B)和量纲一的距离（喷嘴至被冲 引起的向心力使得流动不稳定习，影响射流与表 击凸形表面的距离与狭缝宽度之比，即H/B)对凸 面间的动量和能量交换，使得射流冲击柱状凸形表 形表面换热的影响，并通过数学回归获得了狭缝射 面呈现出与冲击平面不同的换热特性 流冲击凸形表面的Nu关系式.研究结果表明，表面 收稿日期：20110104第 34 卷 第 4 期 2012 年 4 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 34 No． 4 Apr． 2012 狭缝射流冲击柱状凸形表面流动换热特性 柳翠翠1) 姜泽毅1) 张欣欣1) 马 强2) 孙雨生2) 1) 北京科技大学机械工程学院，北京 100083 2) 中国航空规划建设发展有限公司，北京 102206 通信作者，E-mail: zyjiang@ ustb． edu． cn 摘 要 采用数值方法研究了狭缝射流冲击柱状凸形表面的流动换热特性，通过四种湍流模型计算结果与实验数据对比，确 定了湍流模型适用性． 以压力梯度分布为依据，重点分析了狭缝射流沿柱状凸形表面的流动结构和边界层分离特点及柱状凸 形表面的强化换热特性． 结果表明: RNG k--ε 和 Realizable k--ε 模型具有预测适应性; 狭缝射流冲击至柱状凸形表面，气体沿 表面运动，速度降低，并在流动下游发生边界层分离; 量纲一的逆压梯度随量纲一的曲率半径( D/B) 的减小而增大，使得边界 层分离更早出现; 驻点区域换热 Nu 随量纲一的曲率半径( D/B) 的减小而获得增强，但流动进入下游后，D/B 对换热基本无影 响; 压力梯度是影响狭缝射流冲击柱状凸形表面换热分布的重要因素． 关键词 狭缝射流; 凸形表面; 湍流模型; 边界层; 换热 分类号 TK124 Flow and heat transfer characteristics of slot jet impingement to a cylindrical convex surface LIU Cui-cui 1) ，JIANG Ze-yi 1) ，ZHANG Xin-xin1) ，MA Qiang2) ，SUN Yu-sheng2) 1) School of Mechanical Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) China Aviation Planning and Construction Development Co． Ltd． ，Beijing 102206，China Corresponding author，E-mail: zyjiang@ ustb． edu． cn 收稿日期: 2011--01--04 ABSTRACT The flow and heat transfer characteristics of slot jet impingement to a cylindrical convex surface were investigated by the numerical method． Suitable turbulence models were determined by comparing experimental data with the numerical results of four turbu￾lence models． The flow structure，boundary layer separation and wall heat transfer enhancement characteristics of slot jet impingement to a cylindrical convex surface were discussed on the basis of the pressure gradient distribution． The results show that RNG k-ε and Realizable k-ε models are suitable to predict． The slot jet impinges to a cylindrical convex surface，the gas flows along the convex surface，the velocity decreases and the boundary layer separation appears downstream． The dimensionless adverse pressure gradient increases with the dimensionless radius of curvature ( D/B) decreasing，leading to an earlier boundary layer separation． Nu in the stag￾nation region can be enhanced by decreasing D/B． However D/B has almost no effect on heat transfer in the downstream flow． The pressure gradient is a key factor in affecting the heat transfer distribution in slot jet impingement to a cylindrical convex surface． KEY WORDS slot jet impingement; convex surfaces; turbulence models; boundary layers; heat transfer 随着工业生产效率和运行安全性需求的增加， 射流冲击至柱状凸形表面的应用日见广泛，如液态 气体柱状容器的强制换热和火电转子等轴类工件的 喷气冷却． 射流冲击至柱状凸形表面时，由于弧度 引起的向心力使得流动不稳定［1--3］，影响射流与表 面间的动量和能量交换，使得射流冲击柱状凸形表 面呈现出与冲击平面不同的换热特性． 近年来，研究者采用实验手段开展了狭缝射流 冲击柱状凸形表面的流动换热研究，获得了 Re、量 纲一的曲率半径( 一般为被冲击凸形表面直径与狭 缝宽度之比，即 D/B) 和量纲一的距离( 喷嘴至被冲 击凸形表面的距离与狭缝宽度之比，即 H/B) 对凸 形表面换热的影响，并通过数学回归获得了狭缝射 流冲击凸形表面的 Nu 关系式． 研究结果表明，表面 DOI:10.13374/j.issn1001-053x.2012.04.020