Accession Number:

AD0478215

Title:

AERODYNAMIC NOISE TESTS ON X-20 SCALE MODELS. VOLUME 2. SUMMARY AND ANALYSIS REPORT

Descriptive Note:

Final rept. Oct 1964-Aug 1965

Corporate Author:

BOEING AEROSPACE CO SEATTLE WA

Personal Author(s):

• Wiley, David R.
• Seidl, Michael G.

Report Date:

1965-11-01

Pagination or Media Count:

67.0

Abstract:

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.

Descriptors:

• *NOISE
• *AERODYNAMICS
• *BOOST GLIDE VEHICLES
• BOUNDARY LAYER
• MODEL TESTS
• TRANSONIC FLOW
• WIND TUNNEL MODELS
• PRESSURE
• ACOUSTICS

Subject Categories:

• Aerodynamics
• Unmanned Spacecraft
• Spacecraft Trajectories and Reentry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE