螺旋流动探讨

On Helical Flow

In this paper , the characteristic of the helical flow is analysed first from the aspect of kinematics , examples of two variables and axially symmetrical helical flow are givern. Then it is indicated though dynamical analysis that the helical flow of incompressible nonviscous liquid can only be steady , and the energy distribution must be homogenous. For the steady laminar helical flow of incompressible viscous liquid , the component of curl is a harmonic function , and the existence of a potential function for the curl of second order may be expected. For the steady turbulant helical flow , dynamical analysis also shows that there exists certain relationship between the curl and fluctuation .