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High speed civil transport: sonic boom softening and aerodynamic optimization
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Cheung, Samson |
| Copyright Year | 1994 |
| Description | An improvement in sonic boom extrapolation techniques has been the desire of aerospace designers for years. This is because the linear acoustic theory developed in the 60's is incapable of predicting the nonlinear phenomenon of shock wave propagation. On the other hand, CFD techniques are too computationally expensive to employ on sonic boom problems. Therefore, this research focused on the development of a fast and accurate sonic boom extrapolation method that solves the Euler equations for axisymmetric flow. This new technique has brought the sonic boom extrapolation techniques up to the standards of the 90's. Parallel computing is a fast growing subject in the field of computer science because of its promising speed. A new optimizer (IIOWA) for the parallel computing environment has been developed and tested for aerodynamic drag minimization. This is a promising method for CFD optimization making use of the computational resources of workstations, which unlike supercomputers can spend most of their time idle. Finally, the OAW concept is attractive because of its overall theoretical performance. In order to fully understand the concept, a wind-tunnel model was built and is currently being tested at NASA Ames Research Center. The CFD calculations performed under this cooperative agreement helped to identify the problem of the flow separation, and also aided the design by optimizing the wing deflection for roll trim. |
| File Size | 1145229 |
| Page Count | 48 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950004779 |
| Archival Resource Key | ark:/13960/t3b04325s |
| Language | English |
| Publisher Date | 1994-07-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Aerodynamic Drag Civil Aviation Computational Fluid Dynamics Aircraft Design Sonic Booms Parallel Processing Computers Axisymmetric Flow Extrapolation Drag Reduction Shock Wave Propagation Euler Equations of Motion Supersonic Transports Computer Aided Design Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
