新型沙丘形突扩燃烧室三维冷态迎风角度研究
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摘要
对沙丘形突扩燃烧室而言,适当的迎风角度能够保证沙丘的低阻特性并得到稳定的回流区。文中采用Realizable k-ε湍流模型和二阶差分格式对该燃烧室内部流场进行了数值模拟,详细分析了冷态条件下,当突扩比和背风角度一定时,不同迎风角度(0~70°)下沙丘突扩燃烧室内的流动特性,并总结了迎风角度对流场的影响规律,结果表明:迎风角度40°时,燃烧室总压损失小、回流区流动稳定且形状均匀饱满,燃烧室综合性能达到最优。
As for dune-shaped dump combustion,proper windward angle can ensure low resistance characteristics of the dune and obtain stable recirculation zone. The internal flow field of this combustion chamber was simulated by Realizable k-ε turbulence model and secondorder difference scheme. In this paper,the cold flow characteristics of different windward angle( 0 ~ 70°) were analyzed under the certain leeward angle and sudden expansion ratio of the dune-shaped burners. The influence laws of different windward angle on the flow field were summarized. According to calculating results,when windward angle is 40°,combustor suffers less in total pressure loss,the flow recirculation zone is stable,and its comprehensive performance achieves best.
As for dune-shaped dump combustion,proper windward angle can ensure low resistance characteristics of the dune and obtain stable recirculation zone. The internal flow field of this combustion chamber was simulated by Realizable k-ε turbulence model and secondorder difference scheme. In this paper,the cold flow characteristics of different windward angle( 0 ~ 70°) were analyzed under the certain leeward angle and sudden expansion ratio of the dune-shaped burners. The influence laws of different windward angle on the flow field were summarized. According to calculating results,when windward angle is 40°,combustor suffers less in total pressure loss,the flow recirculation zone is stable,and its comprehensive performance achieves best.
引文
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[2]伍波成,梁小平.突扩燃烧室流场及温度场的数值模拟[J].重庆大学学报:自然科学版,1997,20(2):117-122.
[3]曹玉吉.突扩型超音速燃烧室结构设计研究[D].西安:西北工业大学,2006.
[4]席文雄.冲压发动机凹腔燃烧室实验研究与数值模拟[D].长沙:国防科技大学,2008.
[5]江丽娟.新月形沙丘风场的数值模拟[D].兰州:兰州大学,2005.
[6]杨岩岩,刘连友,屈志强,等.新月形沙丘研究进展[J].地理科学,2014,34(1):76-83.
[7]李昊,于胜春,赵汝岩,等.中心突扩燃烧室水流实验与大涡模拟[J].航空计算技术,2008,38(6):17-20.
[8]李凯,曾卓雄,徐义华.新型沙丘形突扩燃烧室三维冷态迎风角度研究[J].弹箭与制导学报,2014,34(6):99-102.
[9]王福军.计算流体动力学分析[M].北京:清华大学出版社,2007.
[10]李昊,林明,张玉山,等.中心突扩燃烧室PIV实验研究[J].实验流体力学,2011,25(4):45-49.
[11]Chaturvedi M C.An analysis of flow througn sudden enlargement in pipes[J].J Hydraul Div,A.S.C.E.,89.(HY3),1963:61-62.
[12]王卫东,过增元,张振家.冲压发动机突扩燃烧室回流涡“热缩”效应的研究[J].推进技术,1996,17(1):8-12.
[13]程平.驻涡燃烧室冷态流场气体喷射的研究[D].大连:大连海事大学,2009.
[14]钟兢军,刘世青.驻涡燃烧室前驻体后端面冷态流场数值模拟[J].热能动力工程,2010,25(5):482-486.
[15]刘世青,钟兢军.驻涡燃烧室最佳中心驻体宽度选择的数值研究[J].航空动力学报,2010,25(5):1005-1010.