Loading...
| Friend's email | |
| Your name | |
| Your email | |
| enter code | |
This page was sent successfuly
- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 48554 (45)
- University: Sharif University of Technology
- Department: Aerospace Engineering
- Advisor(s): Farahani, Mohammad
- Abstract:
- This study aims to evaluate aerodynamic coefficients of an airplane with air breathing engine experimentally. In these experiments, an ejector is used to better simulate flying conditions and aerodynamic interferences generated in inlet and exhaust engine. Therefore, at first, an ejector was designed for simultaneous simulation of exit cold flow and inlet flow of engine. All tests were conducted at QRC Trisonic wind tunnel and at Mach number of 0.5 to 0.85, angles of -4 to 6 deg. and for various amounts of pressure ejector and control surfaces angles. Finally, for the Mach number of 0.5, effect of roughness on the aerodynamic coefficients was examined. The results showed that, drag coefficient is the most afflicted aerodynamic coefficient by jet-on and jet-off conditions. So that the secondary jet injection, decreases the air vehicle drag coefficient. Further, since the mass flow rate of secondary jet flow increases, the drag coefficient reduction will be increased. As Mach number increases, the drag coefficient difference between jet off and jet on condition gets smaller. For verification the flow separation effect on drag coefficient, the closed nozzle is analyzed and compared with previous results. Tests revealed that the surface roughness, reduces lift coefficient and increases the drag coefficient. Pitching and rolling moments induced by control surfaces, determines operating range of them
- Keywords:
- Wind Tunnel ; Ejector ; Experimental Test ; Aerodynamic Coefficient ; Roughened Surface ; Engine Simulator
Digital Object List-
محتواي کتاب - view
Bookmark