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AERODYNAMIC NOISE TESTS ON X-20 SCALE MODELS. VOLUME 2. SUMMARY AND ANALYSIS REPORT
Final rept. Oct 1964-Aug 1965
BOEING AEROSPACE CO SEATTLE WA
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Summaries of fluctuating pressure data presented in Volume I for 1 15th-scale X-20 models are made and discussed. Particular emphasis is given to the high over-all rms pressures measured aft of convex corners during transonic test conditions. Additional information relating to these pressures is presented in the form of pressure histories, peak-amplitude distributions, and power spectral densities. Fluctuating-pressure data and space correlation measurements for three closely spaced microphones are presented, illustrating the local nature of the high-level pressures. Analyses of trends for the maximum over-all rms pressure levels for the X-20 tests and other wind-tunnel tests are made. Design charts are developed for predicting maximum levels aft of cone-cylinder transition sections as functions of transition angle and distance downstream of the transition shoulder. Recommendations are made regarding future aerodynamic noise experimental programs.
APPROVED FOR PUBLIC RELEASE