场结构

• By procceding from the all - gaseous state navier - stokes equation and using eno difference scheme , the limited cold - flow jets produced by ignitors are numerically simulated in srm chamber . then the flow field structure and characteristics are analyzed
  从曲线坐标下的完全气体n - s方程出发,采用eno差分格式,对点火发动机工作初期,在固体火箭发动机内腔形成的受限冷喷流流场进行数值模拟;在此基础上,分析了喷流的流场结构及特性。
• The numerical results show that the flow - field structures and main features of the compressible mixing layer including the distribution of mean velocity , turbulent fluctuation intensities , reynolds stress and growth rates agree well with experimental and other numerical results
  计算出的流场结构和主要的流动特征包括平均速度、湍流脉动强度和雷诺应力的分布以及混合层扩张率都同实验测量和其他时间发展数值模拟结果符合得很好。
• Abstract : by procceding from the all - gaseous state navier - stokes equation and using eno difference scheme , the limited cold - flow jets produced by ignitors are numerically simulated in srm chamber . then the flow field structure and characteristics are analyzed
  文摘:从曲线坐标下的完全气体n - s方程出发,采用eno差分格式,对点火发动机工作初期,在固体火箭发动机内腔形成的受限冷喷流流场进行数值模拟;在此基础上,分析了喷流的流场结构及特性。
• The text computes the eigenvalue of double ridged waveguide , single ridged waveguide and unsymmetry ridged waveguide , transmission of three kinds of ridged waveguides with ridge on the narrow wall are solved for and the useful curves on cutoff wavelength , bandwidth and field pattern are presented
  编程计算了双脊、单脊和不对称脊波导的特征值，求解了三种脊位于窄边的脊波导的传输特性，并给出了截止波长和单模带宽曲线以及场结构变化。
• According to the jet theory and the characteristics of the flow , the flow can be divided into 6 zones : supersonic core zone , supersonic mixing zone , subsonic mixing zone , secondary flow zone and expanding zone . the rules to distinguish these zones were established . 2
  根据射流理论及引射流动特点，将引射流场结构划分为超声速核心区、超声速混合区、亚声速混合区、支板背壁回流区、二次流流动区以及发动机后部膨胀区，并确定了各区域准确划分的原则。
• Finally , the two dimensional flow in the diffuser is calculated , the results show that the change of ma makes an effect to the performance of the diffuser . owing to the accretion of ma , the action of oblique shock waves and the boundary layer pricks up , the flow separates from the wall where the shock waves impinge on the boundary layer more quickly , the cluster of diamond shock waves becomes larger . moreover , by comparing the change of flow field under different structure parameter , it is found that the augment of length of constant area section alter the structure of fluid field little , a smaller area ratio and larger angle of compression section make the diffuser working better
  最后,针对扩压器中的二维流场进行了数值模拟,结果表明马赫数对扩压器性能影响较大,随着马赫数的增大,扩压器管道内激波-附面层干扰加剧,流动从附面层分离相应加剧,激波串数目增多;通过比较不同结构参数下的扩压器内流场,发现等直段长度的变化几乎没有改变流场结构,只是对局部流场稍有影响,并且在其它参数不变的情况下,一定范围内减小面积比a2 / a1和增大收缩角有利于扩压器性能的提高。
• The results show : laser beam far field intensity distribution deflect to the wave length increasing direction , the influence to laser beam far field intensity distribution of different inflow mach number is little than the influence of different inflow pressure ; flow field has more aberration to 1 . 315um laser beam than to 10 . 6um laser beam
  研究表明激光束远场强度分布都向流场光程增大的方向偏折，喷流出口马赫数的变化对激光束远场强度分布的影响较小，喷流出口压力的变化对激光束远场强度分布的影响较强；在相同的流场结构下，流场对波长1 . 315 m激光束的干扰要明显强于对波长10 . 6 m激光束的干扰。
• In order to apply the research results of this paper to the optimum design of computer for cpw , the analytical closed - from of expressions is the best choice . so conformal mapping theories are used to analyze cpw ' s by this paper . the optimum programming , the numerical inversion of conformal transformation and the numerical predictor - corrector method have been utilized to calculate the characteristic parameters and field patterns of cpw ' s
  为了使本论文的研究成果便于应用于共面波导的计算机优化设计中，最好方法是得到封闭的解析表达式，所以本论文采用了保角变换理论宋分析非对称共面波导，并且应用了优化计算方法、保角变换反演技术和数值预测纠正算法对各种非对称共面波导的特性以及场结构进行求解。