Resuspension of uniform latex micro spheres deposited on a single seed pod of field rye grass stalk and head was investigated experimentally in a wind tunnel. The experiment was designed to distinguish aerodynamic (viscous and turbulent) mechanisms from mechanical resuspension resulting from the oscillatory impact of the grass hitting a stationary object. The experiment was run for deposited sp...

A processing system has been developed to meet increasing demands for detailed noise measurement of aircraft in wind tunnels. Phased arrays enable spatial and amplitude measurements of acoustic sources, including low signal-to-noise sources not measurable by conventional measurement techniques. The Microphone Array Phased Processing System (MAPPS) provides processing and visualization of acoust...

Abstract The paper presents the results of wind tunnel tests aimed at determining model bottom drag in case rocket tests. balance measurement technique fixed test section by rear sting was discussed. equipped with two parallel boosters. Based on twin values pressure determined for tested Mach numbers. An algorithm corrections shown, which allowed total determination a active or passive flight. ...