The Study of the Non-Arching Surface Discharge Influence on Gas-Dynamic Processes near Cylinder in Sub-critical Flow

摘要

It is known that processes occurring in boundary layers largely define the structure and character of subsonic gas flow and can lead to phase effects associated with its turbulence [1]. The transition of the flow to a turbulent state is defined by the critical Reynolds number, but can occur due to surface discharge generation [2]. According to [3-4], a Non-Arching surface discharge (NSD) can create directed micro-stream flows (Fig. 1) thus altering the object's aerodynamic properties. From the energy point of view [3], the NSD-use can turn out to be efficient in precritical flow around cylindrical body [5] due to aerodynamic drag reduction [6]. One of the reasons for such reduction of aerodynamic losses may be premature turbulence of the boundary layer (Fig. 2) that changes the critical Reynolds number [7]. The possibility of using NSD to manage the laminar-to-turbulent transition determines the necessity to investigate the characteristic features of gas-dynamic processes in cross-flow of cylindrical bodies.