INFLUENCE OF SCREWS ON AERODYNAMIC CHARACTERISTICS OF AN AIRSHIP AT ITS MOVEMENT THROUGH ATMOSPHERIC JET FLOWS

Abstract

Results of numerical simulation of flow and calculation of aerodynamic characteristics of an airship with and without rotating propellers during motion through the atmospheric jet streams of various types are presented. Research was carried out during motion of the airship for constant angle of attack а = 0…30°, as well as angle characterizing the position of the airship relatively the axis of the jet flow in the horizontal plane, В = 0…175°, velocity of translational motion of airship V = 18.056 m/s, velocity of the jet area with constant velocity Um = 10.67 m/s, propeller revolutions - n = 3000 rev/min, Reynolds number Re = 5.3×106. It was found that while airship passing the jet stream, the absolute values of the coefficients of aerodynamic forces and moments of the airship, both without and as well as with rotating propellers depend considerably on the position of the airship in the jet stream and type of jet stream, the angles а and В, and are several times higher than the coefficient values for the airship, located in the space free of the jet stream. It is demonstratedthat during the airship’s motion through transverse stream its influence on the aerodynamic characteristics of the airship with propellers is more considerable than during motion through updraft.