二元保形非对称膨胀喷管流场特性

谢文忠; 郭荣伟

二元保形非对称膨胀喷管流场特性

南京航空航天大学能源与动力学院,南京 210016

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出版历程
- 收稿日期: 2010-07-01
- 修回日期: 2010-10-10
- 刊出日期: 2011-01-28

Flow field characteristics of a two-dimensional integrated asymmetry-expansion nozzle

College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

摘要

摘要: 利用数值模拟方法对一种与无人飞行器后体一体化设计的二元保形大宽高比非对称膨胀喷管在地面状态的流场特性进行了研究,获得了尾喷管推力性能和三维流动特征随落压比的变化趋势.结果表明:虽然二元保形非对称膨胀喷管沿横向存在非等强度膨胀,但在研究范围内最佳落压比仍主要取决于上方短膨胀面结束位置面积与喉道面积之比;沿横向不等强度膨胀诱发的二次流及旋涡流动能够增强环境冷流与喷流之间的掺混;在研究的落压比范围内,随着落压比的增加喷管的推力性能变化很缓慢.
- 非对称膨胀喷管 /
- 二元保形喷管 /
- 流场特性 /
- 二次流 /
- 数值模拟
Abstract: The flow field characteristics of a two-dimensional uninhabited combat air vehicle (UCAV) aft-body integrated asymmetry-expansion nozzle in ground condition were simulated using a numerical approach which has been validated by NASA (National Aeronautics and Space Administration) experimental data.This study was conducted at NPR (nozzle pressure ratios) from 2.0 to 5.5.Results indicate:(1) In spite of nonuniform expansion at different transverse slices of the UAV (unmanned aerial vehicle) aft-body integrated nozzle,the maximum propulsive performance strongly lies on area ratio of upper shorter ramp end location to the throat. (2) The mixture of internal jet and external cold air can be enhanced by secondary flow and vortex,which are induced by the nonuniform expansion at different transverse slices of the UAV aft-body integrated nozzle. (3) As the NPR increases within this study,the propulsive performance of the nozzle varies a little.
- asymmetry-expansion nozzle /
- two-dimensional integrated nozzle /
- flow field characteristics /
- secondary flow /
- numerical simulation

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参考文献(12)

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