Structure and Stabilization of Thermal, Fluid-and Electrical Fields in High Speed Ionized Gases

高速电离气体中热场、流体场和电场的结构和稳定性

基本信息

批准号：
62460090
负责人：
KAYUKAWA Naoyuki
金额：
$ 4.03万
依托单位：
Faculty of Engineering, Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

Construction and preliminary testings have been made on a crossed laser beam correlation velocimeter and a modified light polarization line reversal system for high speed two-dimensional MHD turbulent boundary-layer temperature measurement. Using these and othermethods involving VxB probe, photodiodes, pressure transducers, generator segmented electrodes and the potential probes, the velocity, the temperature, the gas emission, the pressure, and the electrical signals from subsonic magnetohydrodynamic plasma have been collected in both a combustion and a shock tube systems under conditions each with and without the magnetic field.Analyses of the velocity data have shown that even in a short duration shock plasma a statistically steady state could be established. The Taylor's hypothesis for convective transport of disturbances has evidently confirmed by comparison of the velocity power spectra in the frequency space and that in the wave number space. It has been clearly demonstrated tha … More t the shock plasma has two different turbulent structures simulteneously, namaly a Kolmogorov's 3-D isotropic turbulence with the k^<-5/3> spectrum in a low wave number range and also the 2-D isotropic turbulence with the k^<-3> dependence in the successive higher wave number range. We could show that both turbulent structures were in a so-called inertial subrange, and the magnetic field played a central role for establishing the 2-D turbulent structure.Further, the time dependent 1-D nonlinear MHD equations were solved with disturbances given at the channel entrance. There have been shown two distinct propagation speeds, i.e., the convective and the convective plus sonic speeds. However, it was also made clear that which disturbances could dominate, was decided by the upstream fluctuation processes.Finally, we performed a three dimensional MHD channel flow analysis with a k-epsilon turbulence model and showed that some serious fluiddynamical instabilities could be well suppressed under the magnetic field with a two-component 2-D configuration. Less

已经在交叉激光束相关赛车仪和高速二维MHD MHD MHD湍流边界层温度测量的修改光偏振线逆转系统上进行了构造和初步测试。使用这些和其他涉及VXB探针，光电二极管，压力传感器，发电机分段的电子以及潜在问题的方法，速度，温度，温度，气体发射，压力，压力和电信号以及在磁场的情况下，在每个磁场的情况下都在磁场上均与磁性磁场相机收集。血浆可以建立统计稳定状态。泰勒关于灾害对流运输的假设显然通过比较频率空间中的速度功率谱以及波浪数空间中的速度功率。我们可以证明，这两个湍流结构都处于所谓的惯性子范围中，并且磁场在建立2-D湍流结构中起着核心作用。法勒，依赖时间的1-D非线性MHD方程是在通道入口处给出的分布求解的。已经显示出两个不同的传播速度，即对流和对流和声音速度。但是，还清楚地表明，哪些距离可能占主导地位，是由上游波动过程决定的。在最后，我们使用K-EPSILON湍流模型进行了三维MHD通道流量分析，并表明在磁场下具有两组二级配置的磁场，可以很好地抑制一些严重的流动性不稳定性。较少的