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Predicted and experimental steady and unsteady transonic flows about a biconvex airfoil
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Levy Jr., L. L. |
| Copyright Year | 1981 |
| Description | Results of computer code time dependent solutions of the two dimensional compressible Navier-Stokes equations and the results of independent experiments are compared to verify the Mach number range for instabilities in the transonic flow field about a 14 percent thick biconvex airfoil at an angle of attack of 0 deg and a Reynolds number of 7 million. The experiments were conducted in a transonic, slotted wall wind tunnel. The computer code included an algebraic eddy viscosity turbulence model developed for steady flows, and all computations were made using free flight boundary conditions. All of the features documented experimentally for both steady and unsteady flows were predicted qualitatively; even with the above simplifications, the predictions were, on the whole, in good quantitative agreement with experiment. In particular, predicted time histories of shock wave position, surface pressures, lift, and pitching moment were found to be in very good agreement with experiment for an unsteady flow. Depending upon the free stream Mach number for steady flows, the surface pressure downstream of the shock wave or the shock wave location was not well predicted. |
| File Size | 1093708 |
| Page Count | 20 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810010216 |
| Archival Resource Key | ark:/13960/t2z36n400 |
| Language | English |
| Publisher Date | 1981-02-01 |
| Access Restriction | Open |
| Subject Keyword | Numerical Analysis Flow Stability Navier-stokes Equation Shock Waves Transonic Flow Computational Fluid Dynamics Turbulence Models Finite Difference Theory Steady Flow Airfoils Computerized Simulation Convexity Unsteady Flow 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 |
