Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722937027
Category :
Languages : en
Pages : 156
Book Description
A series of adaptive wall ventilated wind tunnel experiments was carried out to demonstrate the feasibility of using the side wall pressure distribution as the flow variable for the assessment of compatibility with free air conditions. Iterative and one step convergence methods were applied using the streamwise velocity component, the side wall pressure distribution and the normal velocity component in order to investigate their relative merits. The advantage of using the side wall pressure as the flow variable is to reduce the data taking time which is one the major contributors to the total testing time. In ventilated adaptive wall wind tunnel testing, side wall pressure measurements require simple instrumentation as opposed to the Laser Doppler Velocimetry used to measure the velocity components. In ventilated adaptive wall tunnel testing, influence coefficients are required to determine the pressure corrections in the plenum compartment. Experiments were carried out to evaluate the influence coefficients from side wall pressure distributions, and from streamwise and normal velocity distributions at two control levels. Velocity measurements were made using a two component Laser Doppler Velocimeter system. Celik, Zeki and Roberts, Leonard Unspecified Center FLOW DISTRIBUTION; INFLUENCE COEFFICIENT; PRESSURE DISTRIBUTION; WALL PRESSURE; WIND TUNNEL TESTS; WIND TUNNEL WALLS; CONVERGENCE; FREE FLOW; LIFT; MACH NUMBER; PLENUM CHAMBERS; VELOCITY MEASUREMENT; VENTING...