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二维轴对称燃烧室侵蚀与喷管流场的一体化数值模拟 总被引:1,自引:1,他引:1
本文从Navier-Stokes方程出发,采用先进的矢通量分裂算法,对二维轴对称固体火箭发动机燃烧室及喷管的内流场进行了一体化数值模拟,其中耦合进了燃面侵蚀燃烧的加质作用。计算中对超音速为主的流动进行了抛物化处理,对不同格式对亚跨超音速混合流场的适用情况进行了数值试验。本文除了给出主要的内流场参数预示结果外,还将侵蚀结果同实验结果进行了比较 相似文献
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为评价二元超声速进气道在侧滑飞行条件下的适用性,基于Fluent软件,运用CFD数值模拟技术,开展了某实例二元超声速进气道内外流三维流场数值仿真计算,分析了有侧滑时进气道内部的流动性态,揭示出侧滑导致进气道迎风内侧壁附面层增厚,从而强化附面层对超声速扩压段斜激波和喉道段流动的干扰作用,使进气道捕获流量特性和总压恢复性能同步下降,侧滑角越大,进气道总体性能损失幅度越大。总体上,在0°~6°的小侧滑角范围内,因侧滑导致溢流造成进气道捕获流量的相对损失幅度低于3%,总压损失幅度不超过1.29%,表明在此条件下进气道总体性能对侧滑敏感性弱,仍可恰当适用。 相似文献
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X-51A采用带两级压缩楔面的反折式进气道设计方案,这是一体化权衡设计的结果,要求进气道设计综合各方面因素进行多目标优化。从发动机设计角度出发对类似于X-51A的反折式二元进气道进行了研究,合理选择了进气道的设计变量并运用多目标粒子群优化算法(MOPSO)对带两级压缩楔面的反折式二元进气道按总压恢复系数、流量系数及出口马赫数三个目标函数进行了多目标优化设计,计算中性能指标参数评估基于Euler方程求解得到。通过优化计算得到了带两级压缩楔面的反折式进气道相关性能指标参数最优变化关系及结构方案,可为后续进气道与飞行器一体化权衡提供设计参考。 相似文献
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《中国航天(英文版)》2016,(1)
This paper focused on the fundamental and applied research of turbulent flows encountered in the hypersonic flight of aerospace vehicles,which take place in the boundary layer and mixing layer.As to the plate boundary layer,LES approach has been used to simulate the flows over compression corners and incident shock waves,revealing that turbulent flows would significantly inhibit the boundary layer separation caused by shock wave-boundary layer interaction(SWBLI).The boundary layer transition over a circular cone has been analyzed through stability analysis and wind-tunnel test,by which the angle-of-attack effect in case of small angle of attack has been studied.Non-linear evolution process and secondary instability structure in the supersonic mixing layer(Mc=0.5) were initially figured out through the study of mixing layer,and knowledge of the flow control mechanism of the boundary layer and mixing enhancement mechanism of the mixing layer has been obtained through this research.Artificial boundary-layer transition technique based on subharmonic resonance has been proposed and applied to the flow control in a scramjet inlet,inhibiting the flow separation of the boundary layer while improving the inlet performance.To guarantee the mixing of kerosene and supersonic airflow in the scramjet combustor,the mixing enhancement method based on subharmonic resonance has been adopted and a concept of combustor with smooth wall and low internal drag has been proposed for ignition and stable combustion.Finally,future turbulence research and technological development of aerospace vehicles is predicted. 相似文献
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超声速进气道喘振的机理研究 总被引:3,自引:0,他引:3
应用数值模拟方法对中心锥中心进气混压式进气道的喘振现象进行了研究。在数值计算的基础上,根据进气道出口截面每个网格点的压力、密度、速度等参数计算了进气道喘振过程中流量系数和总压恢复系数随时间的变化情况。同时给出了在喘振过程中激波振荡的振幅、频率、对应的波系图案。并根据进气道头部分离涡的发展情况以及进气道内通道中状态参数的变化情况对喘振产生的机理进行了分析,认为进气道头部分离涡对喘振的产生起关键的作用。 相似文献
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本文对三维隅角机翼声速喷流与超声速主流的干扰流扬进行了数值模拟。三维欧拉方程的求解采用非结构网络有限体积伽辽金法(Finite Volume Galerkin Method)。引入了总体结点积分域的概念,简化了从单元矩阵到总体矩阵的汇总过程。通量的分裂采用Osher格式,通过外差使其由一阶精度上升为二阶精度。发展了一种基于线化流量的逆风非结构网格隐式有限元格式以提高求解精度及效率。最后给出了三维隅角机翼流场的算例。 相似文献