| 亚音速矩形射流流场计算及结构分析 |
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| 引用本文： | 鲍国华,成本林.亚音速矩形射流流场计算及结构分析[J].西北工业大学学报,1994(2). |
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| 作者姓名： | 鲍国华 成本林 |
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| 作者单位： | 西北工业大学 |
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| 摘 要： | 本文对亚音速矩形射流的速度场、温度场进行了研究，在喷口等面积的情况下，矩形喷口与圆形或方形喷口相比．其速度场、温度场的核心区段变短，有噪声低、红外隐身效果好的优点．根据湍射流流场中湍流应力远大于招滞力、中心轴上主流速度远大于其它横向速度以及流场中参数在中心轴上的变化远比在其它方向的变化小等特．点，得到简化后的抛物化Ｎ－Ｓ方程，加上Ｋ－ε模型、能量方程，成为湍射流的边界层方程组．本文采用向后推进的差分格式，在每一横截面上利用双向交叉扫描的方法对流场进行求解，计算与实验结果吻合．
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| 关 键 词： | 射流 湍流 矩形射流 抛物流 自由流 |
Flow-Field Calculation and Structure Analysis of Subsonic Rectangular Jets |
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| Bac Guohua,Cheng Benlin.Flow-Field Calculation and Structure Analysis of Subsonic Rectangular Jets[J].Journal of Northwestern Polytechnical University,1994(2). |
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| Authors: | Bac Guohua Cheng Benlin |
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| Abstract: | A subsonic hi of air emanating from a rectangular nozzle has been investigated in this paper.Tlic tcmpcraturc and velocity charactistics of rectangular nozzle decay much more rapidly comparedwith those of circular nozzle and square nozzle with equal exit area.Turbulent free-shear flow exhausting from a rectangular nozzle is formulated using theparabolic-elliptic Navier-Stokes equations in this paper. Turbulent closure is achieved by a modifiedform of K-s two-equation model.The backward difference method is used in this paper, and at eachcross-section in the field the progression is performed by alter direction method.The calculated results arein good agreement with experimental results. |
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| Keywords: | jet turbulence rectangular jet parabolic flow free flow |
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