Recently, the experimental results for the emergence of the plasma shear flow layer in TJ-II have been explained as a second-order phase transition like process by using a simple model of envelope equations for the fluctuation level, the averaged poloidal velocity shear and the pressure gradient (2006 Phys. Plasmas13 122509). Here, we extend this model by incorporating radial coupling. The model is applied to the study of the turbulence–shear flow interaction when the energy flux is low. Transition dynamics and their concomitant thresholds are examined within the context of this model. The effect of an external torque induced by electrode biasing has also been considered. In particular, we analyze the decay rate of the shear flow after switching off the biasing.
最近，利用涨落水平、平均极向速度剪切和压力梯度的包络方程的简单模型，将TJ-II中等离子体剪切流层的涌现实验结果解释为类似二级相变的过程（2006 Phys. Plasmas 13 122509）。在此，我们通过引入径向耦合来扩展该模型。该模型被应用于研究能量通量较低时的湍流-剪切流相互作用。在此模型背景下，考察了转变动力学及其伴随的阈值。还考虑了电极偏置引起的外部力矩的影响。特别地，我们分析了关闭偏置后剪切流的衰减率。