Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/20986
Title: Ground wash flow over deflecting walls. Report 1, Feasibility study
Authors: United States. Army Materiel Command.
Leese, G. W. (Grady W.)
Keywords: Downwash
Ground wash
Aerodynamics
Air flow
Deflectors
Dust control
Blast effect
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous Paper (U.S. Army Engineer Waterways Experiment Station) ; S-69-25 Rept.1
Description: Miscellaneous Paper
Abstract: This report describes an investigation conducted to determine by visual means the flow pattern of air as it moves over deflectors of various sizes and shapes. Knowledge of these flow patterns could be applied to the control of the ground wash blast from various tactical missiles and air vehicles to provide safe operational areas with the minimum of ground surface protection that will alleviate dust cloud formation. Vertical walls have been used to reduce extended ground wash effects and, in turn, to decrease the size of the area requiring protection during several missile launches at the White Sands Missile Range, New Mexico. Tests were conducted utilizing a spherical mirror and photographic equipment to obtain schlieren photographs of airflow paths over the various deflectors in order to choose for further study those that would direct the high-velocity ground wash up above the ground surface and out of the aircraft operational area. The investigation had no specific vehicle problem as its primary object of study. Because it was a small-scale study, only qualitative data were obtained. The schlieren study indicated that the properly shaped deflector will substantially reduce the size of the area of protection required for dust alleviation at a vertical takeoff air vehicle operational site, with a vertical or nearly vertical wall being the optimum shape. The study will be extended to larger scales to determine the boundary layer velocities and changes in location of the flow pattern as flow passes over objects such as sandbags, vertically placed landing mat panels, timber fences, windrowed soils, etc. NOTE: This file is large. Allow your browser several minutes to download the file.
Gov't Doc #: Miscellaneous Paper S-69-25 Rept.1
Rights: Approved for public release; distribution is unlimited.
URI: http://hdl.handle.net/11681/20986
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