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Vince Teixeira 27 March 2008 Structures Nose Cone “Sarah”

Vince Teixeira 27 March 2008 Structures Nose Cone “Sarah”. Nose Cone Design History. Initial design consideration: Low Drag Power-law body: Sharp tip presents heating concern Thermal Analysis Stagnation point heating analysis

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Vince Teixeira 27 March 2008 Structures Nose Cone “Sarah”

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  1. Vince Teixeira27 March 2008StructuresNose Cone “Sarah” AAE 450 Spring 2008

  2. Nose Cone Design History • Initial design consideration: • Low Drag • Power-law body: • Sharp tip presents heating concern • Thermal Analysis • Stagnation point heating analysis • As radius of curvature approaches 0, heating rate approaches infinity (infinite heat transfer to leading edge of nose cone) • Simplified analysis using solid, blunted tip configuration • Structural loading • Axial compression • Important considerations: • Stagnation pressure • G-loading • Result: addition of 8 evenly-spaced stringers AAE 450 Spring 2008 Structures

  3. Heating and Pressure Analysis • Stagnation Point Heating Analysis • Driven by density of fluid, radius of curvature, instantaneous velocity, surface temperature, atmospheric enthalpy • High-altitude/low-density atmosphere drastically reduces heating • Still primary concern for nose cone requirements • Pressure Loading • Axial compression of nose cone • Atmospheric loading due to stagnation pressure • G-loading of solid titanium tip • Axial stringers (Aluminum) added to increase strength • Materials • Solid nose tip: Titanium • Remaining surface: Titanium upper half/Aluminum 7075 lower half • Stringers: Aluminum 7075 AAE 450 Spring 2008 Structures

  4. References • Auman, Lamar M. and Wilks, Brett, “Supersonic and Hypersonic Minimum Drag for Bodies of Revolution.” AIAA 2003-3417, Orlando, FL, June 2003. • Santos, W. F. N., “Leading Edge Bluntness Effects on Aerodynamic Heating and Drag of Power Law Body in Low-Density Hypersonic Flow,” AIAA Journal, Vol. XXVII, No. 3, 2005, pp. 236-242. • Schneider, Steven P., “Methods for Analysis of Preliminary Spacecraft Design,” AAE 450, Spacecraft Design, Purdue University • Aerospace Structural Metals Handbook, 2000 Edition AAE 450 Spring 2008 Structures

  5. Final Nose Cone Design THIS END UP AAE 450 Spring 2008 Structures

  6. Final Nose Cone Masses Nose Cone geometry/mass is a function of third stage diameter AAE 450 Spring 2008

  7. Stagnation Point Heating Analysis Code co-written with Jason Darby AAE 450 Spring 2008

  8. Stagnation Pressure AAE 450 Spring 2008

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