Publisher's Synopsis
A study was performed to determine a limiting separation distance for the extrapolation of pressure signatures from cruise altitude to the ground. The study was performed at two wind-tunnel facilities with two research low-boom wind-tunnel models designed to generate ground pressure signatures with "flattop" shapes. Data acquired at the first wind-tunnel facility showed that pressure signatures had not achieved the desired low-boom features for extrapolation purposes at separation distances of 2 to 5 span lengths. However, data acquired at the second wind-tunnel facility at separation distances of 5 to 20 span lengths indicated the "limiting extrapolation distance" had been achieved so pressure signatures could be extrapolated with existing codes to obtain credible predictions of ground overpressures. Mack, Robert J. and Kuhn, Neil S. Langley Research Center NASA/TM-2006-214524, L-19302 WBS 754-02-07-07 EXTRAPOLATION; SIGNATURES; WIND TUNNEL MODELS; WIND TUNNELS; SONIC BOOMS; SHAPES; DISTANCE
