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Solid Propellants

Ricky Hinton February 6 th , 2008 Propulsion Group Solid Propellant Research and Optimum Expansion Ratio Code Additional help from: Dana Lattibeaudiere and Stephanie Morris. Solid Propellants. HTPB/AP/AL 14-68-14 PBAN/AP/AL 12.5-69.9-16

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Solid Propellants

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  1. Ricky HintonFebruary 6th, 2008Propulsion GroupSolid Propellant Research and Optimum Expansion Ratio CodeAdditional help from:Dana Lattibeaudiere and Stephanie Morris AAE 450 Spring 2008

  2. Solid Propellants • HTPB/AP/AL 14-68-14 • PBAN/AP/AL 12.5-69.9-16 • Integrate these numbers into Dana’s prop code to replace the historical figures • Allows us to solve for rockets ve, mass flow rate, Pe /P0, Me, ε AAE 450 Spring 2008

  3. MATLAB Code: Solve for optimum expansion ratio (ε) and chamber pressure (P0) given stage altitude • Input from Trajectory: • Altitude at stage deployment(s) • Number of stages • Input from Prop code: • Mass flow rate • Exit velocity • Molecular Weight (propellant) • Chamber Temperature • Assumes that 2/3 of the stage altitude is where the Optimum thrust is located (Pe = Pa) • Uses altitude vs. Pa equation to find ambient pressure • Exit pressure known, chamber pressure can be calculated • Preliminary code but it works!!!!! • Currently it runs as an m-file, but it will be a function • Sample case: same inputs as above AAE 450 Spring 2008

  4. Future Work • Continue to develop the Altitude/optimization code that I'm writing • Develop Solid propellants for Dana’s code further • Work with MAT team this Saturday to run inputs • Help prop group with cost modifiers AAE 450 Spring 2008

  5. Additional Slides • Naming Convention • HTPB = Hydroxyl-terminated polybutadine • AP = Ammonium Perchlorate • AL= Aluminum • PBAN = Polybutadiene Acrylonitrile AAE 450 Spring 2008

  6. References • Solid rocket propellants and their properties http://www.sis.lr.tudelft.nl/Propulsion_details/Data/Propellant_properties_files/Solid_props.htm • Industrial Solid propulsion Inc, Propellant Info different compositions http://www.specificimpulse.com/images/ISP_Portfolio.pdf • Pressure vs. Altitude Relationships, S.E. Van Bramer 1/18/1998 http://science.widener.edu/~svanbram/chem332/pdf/press_alt.pdf Additional Help Dana Lattibeuadiere – Original Propulsion code Stephanie Morris – Help writing the new code and researching propellants Elizabeth Harkness – Provided preliminary numbers for trajectory altitude AAE 450 Spring 2008

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