轴对称流

This will make a new approach to research complex and fine structure of flow field inside propulsion, including Interaction between rotor and stator or ship and propulsion, tip clearance-flow and cavitation.

随后，本文针对轴对称体与泵喷推进器组合体的复杂流场进行了数值计算，通过与相近的试验结果的宏观量的对比和分析，表明数值结果具有较好的规律性和合理性。

It was found that the direct connection of saddle point in the axisymmetric parachute sectional flowfield of 0° angle of attack was unstable.

分析发现0 迎角时轴对称降落伞截面流场中鞍点与鞍点直接连接的状态是不稳定的。

The theory of accretion disks are important for many astrophysical phenomena, including Quasars, active galatic nucleic, X-ray binary stars, and young stellar objects. The most important branch of accretion djsk theory is the stability properties of djsks. It is widely considered that the luminosity variations of various astronomical objects are associated with the instability of accretion disk. The viscosity plays an important role in the accretion disk theory, and magnetic field exists commonly in astronomical phenomena. A more realistic analysis of the stabihty of the accretion disk should include both the radjal and azimuthal perturbations because of the strong shear of viscous flow.In this paper, according to the luminosity Variations of Various astronomical objects, we study the radial-azimuthal instability of an isothermal with magnetic field. We find that the radial and azimuthal fields B〓,B〓 are mainly responsible for enhancing the instability of the magneto-acoustic modes and non-axisymmetric modes,and that pulsational oscillations are larger in the radial than in the Z direction. The model may be useful in explaining the periodic light variation of FU orionis and. T Tauri stars.

在许多天体物理现象中，例如活动星系核，X-射线双星和年青的恒星理论中，吸积盘理论起着重要的作用，而吸积盘理论中的一个重要分支是吸积盘的不稳定性理论，普遍认为活动天体的周期，准周期光变现象与吸积盘的不稳定性有关，在吸积盘理论中，粘滞起着重要的作用，而磁场是天体物理中普遍存在的现象，对于几何薄吸积盘不稳定性分析，由于强剪切流的缘故，应该包括径向和环向扰动两个方面，本文结合天体物理中的各种周期，准周期光变现象，研究了含磁场的等温薄吸积盘的径向-环向振荡不稳定性，结果表明：磁场的径向和环向分量对磁声模和非轴对称模的不稳定性的增加起着主要的作用，且径向振荡大于轴向振荡，所得结果有利于解释FU Orionis和T Tauri Stars的周期光变现象。

This paper establishes two PDE models on the base of analyzing radical principle of detonation wave, formation characteristics and propagation mechanism as well as performance of detonation wave, and working principle and cycle of pulse detonation engine. Then give a 2D axisymmetrical numerical simulation of internal flow field of the detonation chamber.

本文在分析爆震波的基本理论、爆震波的形成特点、传播机理及其特性和脉冲爆震发动机的工作原理的基础上，建立了两个PDE模型，并用FLUENT对其爆震室内流场进行了二维轴对称数值模拟。

The contact arrangements (K1 and KT) are designed to be coaxially symmetrical and are arranged in a pressure-resistant housing.

第二转换路径(P2)包含串联的开关设备和限流元件，触点装置K1和KT）被设计成同轴对称的并且设置在能承受一定压力的外壳

An analytical model was presented to study the cloud expansion during near field regime, and the liquid fuel expanding velocity-radius relation and the liquid breakup model were given. A 2-dimensional axisymmetrical diphasic flow numerical simulation for cloud expansion during far-field regime was carried out, and the distribution parameters of fuel in cloud were given.

对近场阶段云雾的膨胀采用分析模型来研究，给出了这一阶段液体燃料膨胀的速度—半径关系及液体环的破碎规律；对远场阶段云雾的膨胀采用二维轴对称两相流的数值模拟来研究，得出了云雾中燃料的分布状态随时间的变化规律。

Physical and numerical models were establishedased on NˉS c ontrol equations and RNG kˉεturbulence model, the interior flow fields of the nozzles were analyzed through num erical method, both the flow parameters change trend and thrust speciality of the asymmetry quadrate nozzle were resea rched.

文中建立了非对称方形尾喷管及传统轴对称尾喷管的物理数学模型，基于N S方程和RNG kε湍流模型，对两种尾喷管三维内流场进行了数值分析，研究了非对称方形尾喷管内部流动参数的变化趋势及其推力特性。

A non-singular single integral mathematical model is adopted to calculate the external intermittent and alternative longitudinal magnetic field acquired by single axisymmetrical and cylindrical hollow coil t which is coaxial to electrode and excitated by a revisable pulsed current of square wave t in austenitic stainless steel GTA welding.

针对奥氏体不锈钢外加纵向磁场的气体保护钨极电弧焊接时，与电极同轴的单个轴对称空心圆柱线圈在双向脉冲矩形励磁电流作用下产生的间歇交变纵向磁场，采用无暇点单积分磁场的数学模型，对＊TAW焊接外加间歇交变纵向磁场进行了数值计算，该方法具有模型简单、计算速度快和精度高等优点并讨论了该间隙交变纵向磁场的分布、磁场的均匀性及其纵向分量与径向分量的比率等规律及其对焊接行为的影响，认为横磁分量将削弱GTAW外加纵向磁场的有利作用，影响磁控电弧的焊接质量

The change of motor thrust ,deflection angle of thrust line with scarfed angle was investigated.

应用有限体积法建立了三维守恒型N-S方程组的数值求解器，对某非轴对称斜切喷管内流场开展了数值模拟计算，研究了斜切角度变化时引起的发动机推力及推力线偏转角变化。

Through 2D axial symmetrical and 3D scarfed reversal nozzle calculating, the main flowfield characters were given, and compared with the experiment data for validation. Then, the program was given, which can well predict the performance of the scarfed reversal nozzle. In this paper, the flowfields of open cavities with different structures and different parameters were calculated. Some new, full and more reasonable mechanism interprets were given. We think that the essential cause of pressure oscillatory is coherent effect of wave, eddy and cavity structure, but the procedure is different with different cavity structure, it can not use single procedure to described.

通过对二维轴对称和三维斜切反喷管的计算分析，本文给出了流场的主要特征，并采用实验数据进行了验证，形成了分析斜切反喷管可靠的应用方法；本文通过对不同结构形式、不同参数的二维、三维非定常超声速开式空腔流动进行的计算分析，提出了较为全面、合理的空腔压力振荡循环机理的解释，本文认为压力脉动本质上是波、涡以及结构之间相互的干扰和耦合，但干扰的具体过程随空腔结构的不同差别较大，不能采用单一的规律进行描述。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。