Aerodynamic Shape Optimization of a Subsonic Inlet Using Three-Dimensional Euler Computation
| Autor: | E. S. Reddy, R. E. Moody, D. R. Reddy |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Airfoil
geography geography.geographical_feature_category Angle of attack Mechanical Engineering Aerospace Engineering Mechanics Inlet Physics::Fluid Dynamics symbols.namesake Fuel Technology Classical mechanics Mach number Space and Planetary Science Euler's formula symbols Takeoff Reynolds-averaged Navier–Stokes equations Mathematics Crosswind |
| Zdroj: | Journal of Propulsion and Power. 14:225-233 |
| ISSN: | 1533-3876 0748-4658 |
| DOI: | 10.2514/2.5271 |
| Popis: | A design optimization study of a subsonic inlet is presented where the peak Mach number at cruise condition on the inside of the inlet surface is the objective function to be minimized and inlet lip shape parameters are the design variables. The peak Mach number at takeoff, rolling takeoff, static, and crosswind conditions are constrained to an upper limit. The three-dimensional ow eld is predicted by the NPARC computational uid dynamics code in Euler mode. A GRAPE(grids about airfoils using Poisson’s equation) based three-dimensional grid generator is employed to generate a C-grid around the inlet. Constrained numerical optimization is carried out by interfacing NPARC with the automated design synthesis optimization code. The constrained optimum is obtained by the method of feasible directions. The required gradients for optimization are computed via forward difference scheme. At the baseline (initial) design, takeoff, rolling takeoff, and crosswind conditions have their peak Mach numbers exceeding the upper bounds. However, at the constrained optimum design, only the upper limit on the takeoff peak Mach number is found to be critical with no appreciable change in cruise Mach number. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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