|Table of Contents|

Numerical simulation of flow and heat transfer in a curved rectangular channel with artificial roughness(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年01期
Page:
20-27
Research Field:
研究与设计
Publishing date:

Info

Title:
Numerical simulation of flow and heat transfer in a curved rectangular channel with artificial roughness
Author(s):
ZHANG Meng;  SUN Bing
(School of Astronautics, Beihang University, Beijing 100191, China)
Keywords:
regenerative cooling;  artificial roughness;  secondary flow;  heat transfer enhancement;  convective heat transfer
PACS:
V434.14文献标识码:A 文章编号:1672-9374(2020)01-0020-08
DOI:
-
Abstract:
As a local heat transfer enhancement technology, artificial roughness is of great significance to improve the regenerative cooling efficiency. In order to study the influence of artificial roughness on the three-dimensional flow and heat transfer characteristics of the rectangular cooling channel, and the coupling effect with the secondary flow in the curved section, a three-dimensional curved rectangular channel with artificial roughness was modeled and simulated by Fluent software in this paper. RNG k-䥺SymboleA@ turbulence model was used to effectively and accurately solve the turbulent flow in the pipeline and near-wall flow affected by the strong curvature. The results show that adding artificial roughness to the bottom of the cooling channel will disturb the bottom flow and cause the velocity center to move up. Therefore, in the curved section, the range of Dean vortices generated in the cooling passage with artificial roughness is relatively small and far from the bottom. With the generation of the secondary flow, the flow velocity center moves to the bottom, so that the heat transfer is enhanced and the overall convective heat transfer coefficient is increased. When the inlet mass flow rate is 0.1 kg/s, 0.2 kg/s and 0.3 kg/s, the average convective heat transfer coefficients of the heating surface in the curved section under artificial roughness conditions increase by 11.86%, 13.11% and 16.14%, respectively. It is shown that the heat transfer can be improved obviously by adding artificial roughness, and its effect on heat transfer becomes more and more obvious with the increase of mass flow rate.

References:

[1] 刘国斌.液体火箭发动机原理[M].北京:宇航出版社,1993.
[2] 蔡国飙.液体火箭发动机设计[M].北京:北京航空航天大学出版社, 2011.
[3] 章思龙, 秦江, 周伟星, 等.高超声速推进再生冷却研究综述[J].推进技术, 2018, 39(10):2177-2190.
[4] 陈建华, 杨宝庆, 周立新, 等.人为粗糙度强化换热机理分析及效果评估[J].火箭推进, 2004, 30(4):1-5.CHEN J H, YANG B Q, ZHOU L X, et al.The mechanism and effect of artificial roughness on heat transfer enhancement[J].Journal of Rocket Propulsion, 2004, 30(4):1-5.
[5] HOSSAIN J, TRAN L V, CARPENTER C, et al.Numerical study of enhancement of regenerative cooling using ribs[R]. AIAA 2013-3996.
[6] XU K K, TANG L J, MENG H.Numerical study of supercritical-pressure fluid flows and heat transfer of methane in ribbed cooling tubes[J].International Journal of Heat and Mass Transfer, 2015, 84:346-358.
[7] KAMALI R, BINESH A R.The importance of rib shape effects on the local heat transfer and flow friction characteristics of square ducts with ribbed internal surfaces[J].International Communications in Heat and Mass Transfer, 2008, 35(8):1032-1040.
[8] NARAGHI M, DASSONVILLE R.Improved correlations for curvature effects in cooling channels of rocket engines[C]//48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit.Atlanta, Georgia.Reston, Virigina:AIAA, 2012.
[9] VALENTIN J, NARAGHI M.Effects cooling channel curvature on coolant secondary flow and heat transfer[C]//46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit.Nashville, TN.Reston, Virigina:AIAA, 2010.
[10] PIZZARELLI M.Effectiveness of spalart-allmaras turbulence model in analysis of curved cooling channels[J].AIAA Journal, 2013, 51(9):2158-2167.
[11] PIZZARELLI M, NASUTI F, ONOFRI M.CFD analysis of curved cooling channel flow and heat transfer in rocket engines[C]//46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit.Nashville, TN.Reston, Virigina:AIAA, 2010.
[12] 康玉东, 孙冰.燃气非平衡流再生冷却流动传热数值模拟[J].推进技术, 2011, 32(1):119-124.
[13] 丁珏, 翁培奋.三种湍流模式数值模拟直角弯管内三维分离流动的比较[J].计算物理, 2003, 20(5):386-390.
[14] 赵金辉, 王志国, 晋世强.不同曲率直径比下90°弯管内部流场分析[J].轻工科技, 2014, 30(8):64-65.
[15] 孙业志, 胡寿根, 赵军, 等.不同雷诺数下90°弯管内流动特性的数值研究[J].上海理工大学学报, 2010, 32(6):525-529.
[16] 湛含辉, 朱辉, 陈津端, 等.90°弯管内二次流(迪恩涡)的数值模拟[J].锅炉技术, 2010, 41(4):1-5.

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Last Update: 2020-02-25