A potential-based surface panel method is applied to predict the performance of a marine propeller, with emphasis on the trailing edge and the surface of trailing vortex sheet. 应用低阶速度势面元法建立了预报船舶螺旋桨水动力性能的数值方法,重点对桨叶随边和尾涡面进行研究。
In the study of the second leading edge problem, the displacement effect of vortex sheet from the plane of symmetry is taken into account and thereby the difficulty of overlapping vortex sheet and the lifting surface is overcome. 对于第二前缘问题,考虑了涡面离开流动对称面的位移影响,并由此克服了涡面和物面重叠带来的困难。
A modified trailing vortex wake model of propeller is introduced to describe the distortion and separation of the trailing vortex sheet. 采用了一个修正的螺旋桨尾涡模型,来模拟导管螺旋桨尾涡片的扭曲变形及分离现象。
Analysis of Rolling-up of Trailing Vortex Sheet 关于尾涡层卷起过程的分析
Numerical Simulation of 3D Foil with Trailing Vortex Sheet Roll-up 三维机翼尾涡面卷曲的数值模拟
In order to determine critical wind velocity of mem-brane at first order instability, further vortex sheet on membrane is used to substitute the infinitesimal thickness boundary layer between wind and membrane surface. Expression of aerodynamic force is obtained; 为了确定薄膜一阶失稳时的风速,进一步用涡旋面代替风与薄膜表面之间的微小厚度边界层来推导薄膜表面所受的气动力表达式;
Interactions of the vortex induced reconnection processes in periodic multiple current sheet systems 周期性多电流片系统中涡旋诱发重联过程的相互作用
The instability of the vortex sheet along the horizontal shear line 水平切变线上涡层不稳定理论
Calculation of Trailing Vortex Sheet and Downwash Field Behind a Sweptback Wing 后掠机翼尾涡面和下洗场计算
It can be shown that when the overlapping vortex sheet approaches close to the body surface infinitely, its effect on the flow vanishes. 分析表明,当重叠部分的涡面无限接近物体(升力面)表面时,涡面的作用趋于消失。
Experimental study was performed for the formation and development of the horseshoe vortex in turbulent boundary layer through using a new method of visualization ( moving sheet of laser light) and several experimental skills. 采用一种新的流场显示方法(激光片光运动法)和不同实验方案对湍流边界层中的马蹄涡(或称发卡涡)进行了实验研究,其中包括马蹄涡的生成和发展过程。
By using several thousands of point vortices and small space mesh, we obtain the large scale discrete vortices on the vortex sheet as result of the pairing of small point vortices, thus simulate the instability phenomena of the rolling-up vortex sheet. 由于使用了数千个点涡和较小的空间网格,获得了前缘涡层小涡配对出现的较大的离散涡,模拟了紧卷涡层的不稳定现象。
It has been shown [ 1,2] that, in a high Mach number flow, the jet [ 1] or the vortex sheet [ 2] may be stable. 文献[1,2]曾指出,高M数流动条件下,射流或涡层可能是稳定的。