Aero-Acoustic Environment of Rectangular Cavities with Length to Depth Ratios of Five and Seven
Abstract
The complete program included the flight testing of 5 cavity configurations; three empty cavities, one with an ogive store, and a closed cavity configuration to determine the existing boundary layer characteristics. All flight tests have been completed. The results for one of the empty cavities and the closed cavity were presented in Reference 1 with the results for the remaining three configurations being presented in this report. Each of the 5 configurations were tested at constant pressure altitudes of 3,000 ft, 20,000 ft, and 30,000 ft. The range of Mach numbers tested were 0.61 - 0.93 at 3,000 ft and 0.61 - 1.30 for 20,000 ft and 30,000 ft. Continuous data were recorded as the aircraft slowly accelerated from the lowest Mach number to the highest Mach number. For each flight condition, with the open cavity, fluctuating pressures were measured at nine locations in the cavity and static pressures were measured at three cavity locations. In addition vibration levels were measured with an accelerometer. For the closed cavity instrumentation was provided to define the boundary layer characteristics prior to opening the cavity which included a microphone, thermocouple, static pressure port and pressure rake. Data were recorded on an FM magnetic tape recorder and data reduction and analysis were performed in the laboratory. Details of the test procedures, instrumentation, data reduction and analysis are given in Appendix A.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1974
- Accession Number
- ADA377360
Entities
People
- D. E. Seely
- David L. Smith
- L. L. Shaw
- R. D. Talmadge
Organizations
- Flight Dynamics Laboratory