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Wind-tunnel investigation of the validity of a sonic-boom-minimization concept. [langley unitary plan wind tunnel tests for supersonic transport design
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mack, R. J. Darden, C. M. |
| Copyright Year | 1979 |
| Description | The Langley unitary plan unitary plan wind tunnel was used to determine the validity of a sonic-boom-minimization theory. Five models - two reference and three low-boom constrained - were tested at design Mach numbers of 1.5 and 2.7. Results show that the pressure signatures generated by the low-boom models had significantly lower overpressure levels than those produced by the reference models and that small changes in the Mach number and/or the lift caused relatively small changes in the signature shape and overpressure level. Boundary-layer effects were found in the signature shape and overpressure level. Boundary-layer effects were found to be sizable on the low-boom models, and when viscous corrections were included in the analysis, improved agreement between the predicted and the measured signatures was noted. Since this agreement was better at Mach 1.5 than at Mach 2.7, it was concluded that the minimization method was definitely valid at Mach 1.5 and was probably valid at Mach 2.7, with further work needed to resolve the uncertainty. |
| File Size | 1347585 |
| Page Count | 50 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19800001863 |
| Archival Resource Key | ark:/13960/t1dk07h46 |
| Language | English |
| Publisher Date | 1979-10-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Pressure Drag Overpressure Wind Tunnel Tests Inviscid Flow Aircraft Design Sonic Booms Supersonic Transports Supersonic Boundary Layers Aircraft Configurations Optimization Viscous Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
