Aerodynamic Characteristics of a Hypersonic Vehicle Configuration During Intake Flow Through Condition and Intake Closed Condition
- Paper number
IAC-07-D2.5.01
- Author
Dr. T.K. Ganesh Anavaradham, Defence Research and Development Laboratory, India
- Coauthor
Mr. S. Panneerselvam, Defence Research and Development Laboratory, India
- Year
2007
- Abstract
This paper describes the aerodynamic characteristics of a scramjet integrated vehicle during intake closed and intake open condition at Mach number 6.5. The engine integrated aerodynamic configuration has been designed to provide required aerodynamic force, stability and control. It has been also designed to provide required compression/expansion for engine so that the airframe engine integrated vehicle flies in the cruise mode efficiently. The configuration consists of fore body, mid body, after body, wings and tail surfaces. Scramjet engine is placed at the bottom surface of the mid body. The under surface of the fore body has been designed in such a way to provide required external compression to the air intake. Initially, an intake cowl is used to keep the intake in closed condition and it opens in a very short time facilitating the starting of intake. The intake further compresses the air and supplies the required air mass flow rate to the combustor. The after body is a part of the exhaust nozzle of the scramjet propulsion. The body configuration is non-circular as better characteristics in pitch plane are required compared to the yaw plane. Aerodynamics configuration of the cruise vehicle at different angles of attack has been evolved through Navier Stokes simulations with standard k-e turbulence model. The simulation involves simultaneous internal – external flow simulation. Cartesian solver has been used to carry out the Navier Stokes simulation for intake closed condition and intake open condition. The aerodynamic coefficients have been compared between intake cowl closed and open condition. The normal force and axial force for the intake cowl closed condition is higher compared to intake cowl open condition due to higher pressure on the closed intake cowl. The axial force coefficient is five times higher for the intake-closed condition as compared to intake open condition. The vehicle is highly unstable in the intake-closed condition as compared to intake cowl fully open condition. This is due to the fact that the forces acting on the intake cowl are ahead of the CG location. The highly unstable vehicle during intake-closed condition has resulted in a requirement of faster opening of the intake cowl, so as to have a controllable vehicle.
- Abstract document
- Manuscript document
IAC-07-D2.5.01.pdf (🔒 authorized access only).
To get the manuscript, please contact IAF Secretariat.