The disturbance located at inner region and near eyewall intensifying corresponds to the growth of amplitude of typhoon maximum tangential velocity with shorter period and the opposite is true . the weakening role of periphery disturbance intensity drop in typhoon maximum tangential wind reduces iv rossby obviously and the mean tangential wind display a strong vibrational characteristic for the periphery disturbance intensity growth 台风内核区和眼壁附近扰动的减弱(加强)使台风最大切向风速的增幅减小(增大) ,且强度增强,风速变化的震荡性加强,震荡的周期缩短;强度减弱,风速变化的震荡性减弱,震荡的周期加长。
Relaxation factors are adopted . a program is produced to simulate swirling air flow in a horizontal straight pipe and compare with experiment data . the simulation prove that the modified k - model can predict the core , annular and wall regions near entrance and axial velocity far from entrance , but it ca n ' t predict tangential velocity well in weak swirling area far from entrance 编程计算水平圆管内螺旋气流的流动参数并与实验数据对比,结果表明修正-湍流模型在近入口处基本上能预测出中心区、环形区和近壁区的流动特性,在远离入口弱旋流区域对轴向速度的预测符合实际情况,但是出现对周向速度修正过大的现象。
Based on the transfer - matrix method , the general expressions of equivalent four - terminal network parameters of varying section torsional horn are derived , the relations between frequency equation and both the rotational velocity amplification and that of the surface tangential velocity of stepped type torsional ultrasonic horn with transitional section of cosine - like type are obtained 摘要基于传递矩阵算法,推导出了变截面杆扭转振动时等效四端网络参量的一般表达式,研究了带类余弦过渡段阶梯形变幅杆扭转振动频率方程与角速度放大倍数及外表面切向速度放大倍数等的关系。