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Alex Woods 2/6/08 Aerothermodynamics Group Cp and Cd Models

Explore the coefficient of pressure & drag models in supersonic theory, useful for calculating Center of Pressure, Drag values, & Moments. Integrating further aero codes for trajectory optimization. References key aerodynamics texts.<br>

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Alex Woods 2/6/08 Aerothermodynamics Group Cp and Cd Models

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  1. Alex Woods2/6/08Aerothermodynamics GroupCp and Cd Models

  2. Cp and Cd models • Coefficient of Pressure • Used linear supersonic theory • Code scales with any given approximate geometry • Useful for determining locations of Center of Pressure, Drag values, Moments Group Name (i.e.Trajectory Optimization)

  3. Drag Coefficients • Drag coefficient scales with starting axial force. • Drag increases approximately linearly for small aoa’s Future Work • Integrate further aero codes into Master • Take part in MAT duties Chart by Alex Woods and Jayme Zott Group Name (i.e.Trajectory Optimization)

  4. References • Ashley, Holt, Engineering Analysis of Flight Vehicles, Dover Publications Inc., New York, 1974, pp. 303-312 • Anderson, John D., Fundamentals of Aerodynamics, Mcgraw-Hill Higher Education, 2001 • Jayme Zott, for working with me, as well as her previous work with drag coefficients • Professor Colicott, in reference to linearized theory applications Group Name (i.e.Trajectory Optimization)

  5. Backup Slides • Assumptions • Nose Cone may be modeled in two dimensions as a wedge • Adjacent stream lines vary with the cosine of the cylindrical angle from the windward radian • Drag coefficient scales upwards from Cd = .15 • Rocket diameter small enough to be considered within Linear Supersonic Theory

  6. Drag Scaling with Angle of Attack • Drag should scale with aoa according to the equation: Cn is output from Cp code, while Ca is output by Jayme’s cd_m code.

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