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lecture_16 - 16.512 Rocket Propulsion Prof Manuel...

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16.512, Rocket Propulsion Prof. Manuel Martinez-Sanchez Lecture 16: Solid Propellants: Design Goals and Constraints Solid Propellants Read Sutton’s , Chapter 12 Double Base (DB) Nitrocellulose + Nitroglycerine + Additives (for opacity, plasticity, …). Both NC and NG are explosives, dangerous sometimes JPN NC 51.5%, NG 43%, Diethyl phthalate 3.2%, Ethyl centralite 1%, H 2 SO 4 1.2% + carbon black + candelilla wax Composite Modified Double base (CMBD) DB + Ammonium perchlorate (AP) or Aluminium (Al) Composite (C) AP (sometimes A Nitr) + Synthetic Rubber binder (fuel) + Al. Safer than DB Other Composite contain nitramine explosive (RDX, HMX), replacing some AP Type I sp (s) at 1000/14.7 psi T c (K) p ρ (g/cm 3 ) Al % r (cm/s) @1000 psi η Fabrication DB 220-230 2530 1.60 0 1.14 0.3 Extruded DB-AP-Al 260-265 3866 1.79 20-21 1.98 0.4 Extruded CTPB/AP/Al 260-265 3370-3490 1.76 15-17 1.14 0.4 Cast HTPB/AP/Al 260-265 3370-3490 1.85 4-17 1.02 0.40 Cast The addition of Aluminum is not necessarily beneficial, as the following example shows: Problem 3. Adding Aluminum to the formulation of a solid rocket propellant increases
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