带60°肋和气膜孔矩形通道换热研究
Heat transfer in the rectangular passage with 60-degree ribs and film holes
-
摘要: 采用非结构化网格和realizablek-ε紊流模型,求解三维N-S方程,对带60°肋和气膜孔矩形通道在入口雷诺数9×104,气膜孔总出流比为0.22时进行了换热特性的数值模拟。带气膜孔的壁面换热特性和实验数据吻合的很好,在此基础上,分析了其它各个壁面的换热特性。结果表明,带肋和气膜孔的通道流场非常复杂,扰流肋的存在使各壁面的换热都得到了增强,但增强幅度的差别较大。换热最强的区域并不是带肋的上下壁面,而是光滑的右侧壁面。Abstract: Numerical simulation was conducted to investigate heat transfer in a rectangular channel with both 60-degree rib-roughened wall and film hole suctions with Reynolds number of 9×104 and suction ratio of 0.22.A finite volume method with unstructured meshes was used to solve the three dimensional compressible Navier-Stokes equations.The realizable k-ε model was used carefully and the enhanced wall function was utilized for near wall treatment.The numerical results agree well with the experimental data of the surface with both ribs and film holes.Based on this,investigation was focused on the heat transfer of three other surfaces.The numerical result shows that the flow of the passage is very complex.Heat transfer is enhanced because of the ribs.Maximum Heat transfer coefficient is found on the smooth right surface but not the surfaces with ribs.
-
Key words:
- aerospace propulsion system /
- aircraft engines /
- internal cooling passage /
- heat transfer /
- ribs /
- film holes
-
[1] 裘云,朱惠人,倪萌,等.带肋壁与出流孔内流通道中肋角度对流量系数的影响[J].航空动力学报,2003,18(2):233-238.Qiu Yun,Zhu Hui-ren,Ni Meng,et al.Effect of rib turbulator orientation on the discharge coefficient of suction hole in the internal passage[J].Journal of Aerospace Power.2003,18(2):233-238. [2] 刘湘云,丁水汀,陶智,等.不同肋间距变截面回转通道内的流阻和换热特性[J] 航空动力学报,2004,19(5):640-644.Liu Xiang-yun,Ding Shui-ting,Tao Zhi,et al.Characteristic of flow resistance and heat transfer in a turnover variable cross-section channel with different rib pitches[J].Journal of Aerospace Power,2004,19(5):640-644. [3] Han J C.Heat transfer and friction characteristics in rectangular channels with rib turbulators[J].ASME.Journal of Heat Transfer,1998,110:321-328. [4] Jang Yong-Jun,Chen Hamn-Ching,Han Je-Chin.Prediction of flow and heat transfer in rotating two-pass rectangular channels with 45-deg rib turbulators[J].ASME Journal of Turbomachinery,2002,124(4):146-152. [5] 裘云,朱惠人,许都纯,等.出流孔对内流通道壁面换热影响的实验[J].推进技术,2002,23(6),477-480.Qiu Yun,Zhu Hui-ren,Xu Du-chun,et al.Effect of suction hole on heat transfer characteristic of internal passage[J].Journal of Propulsion Technology,2002,23(6):477-480. [6] Byerley A R,Jones T V,Ireland P T.Internal cooling passage heat transfer near the entrance to a film cooling hole:experimental and computational results[R].ASME Paper 92-GT-241. [7] Fluent user's guide[M].Fluent Inc,2001. -
点击查看大图
计量
- 文章访问数: 1750
- HTML浏览量: 71
- PDF量: 476
- 被引次数: 0
下载: