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Alex Woods February 21st Aerothermodynamics Group Aerodynamic Forces Code

Alex Woods February 21st Aerothermodynamics Group Aerodynamic Forces Code. Aerodynamic Forces. Predicts coefficients of pressure over the surface of the rocket Integrates Cp to find coefficients of normal force and pitching moment (Cn, Cm)

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Alex Woods February 21st Aerothermodynamics Group Aerodynamic Forces Code

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  1. Alex WoodsFebruary 21stAerothermodynamicsGroupAerodynamic Forces Code

  2. Aerodynamic Forces • Predicts coefficients of pressure over the surface of the rocket • Integrates Cp to find coefficients of normal force and pitching moment (Cn, Cm) • Uses Cn and Cm to determine the location of the center of pressure • Thanks to Kyle Donahue for additional geometric data Group Name (i.e.Trajectory Optimization)

  3. Structural Forces • Uses Cn data to determine shear forces within the rocket, as well as determining bending moments. • Code computes data for each stage coupling. • Future Work: • Ensure accuracy for high aoa cases • Modify code for changing design parameters

  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 • Professor Williams, concerning the use of pressure coefficients to determine aerodynamic forces • The Aerothermodynamic Group for help with the code

  5. Assumptions and Concerns • The linear theory used to determine pressure coefficients is primarily valid for thin airfoils; additional terms are necessary for better application to slender rocket bodies. • Small angles of attack – Normal forces become non-linear past 6 degrees. • Results vary by the number of data points and the locations from which they are taken; small step sizes bias the effects of long cylindrical sections

  6. Concerns cont. • Code does not yet compute axial forces, which would allow for the computation of drag. • Moment values being found are unusually small compared to results found in the Holt Ashley text • Location of center of pressure is unusually far aft compared to Vanguard example

  7. Pretty Pictures

  8. Contributions • Center of Pressure code • Calling function for all applicable codes • Rocket volume computations • Pressure Coefficient integrations • Normal force coefficients • Pitching moment coefficients • Shear Forces • Bending Moments

  9. Contributions Cont. • Sea Launch • Tugboat hiring costs • Barge rental costs Thanks to Jerry White of Oregon Offshore Towing for these estimates • Drag Code Assisted Jayme Zott in creating and integrating drag models • Wing Code Assisted Brian Budzinski in the modification of his wing and fin codes

  10. Contributions Cont. • MAT team member – helped troubleshoot version 1.0, ran six two stage cases for the initial group of cases.

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