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Hybrid Engines • Conventional hybrid vs. “reverse” hybrid • 4 Main Components of Hybrid Engine • Ignition system • Fuel chamber www.aspirespace.org.uk

Hybrid Engines Conventional hybrid vs. “reverse” hybrid 4 Main Components of Hybrid Engine Ignition system Fuel chamber

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Page 1: Hybrid Engines Conventional hybrid vs. “reverse” hybrid 4 Main Components of Hybrid Engine Ignition system Fuel chamber

Hybrid Engines

• Conventional hybrid vs. “reverse” hybrid

• 4 Main Components of Hybrid Engine

• Ignition system

• Fuel chamber

www.aspirespace.org.uk

Page 2: Hybrid Engines Conventional hybrid vs. “reverse” hybrid 4 Main Components of Hybrid Engine Ignition system Fuel chamber

PMMA or HTPB?

• PMMA (Poly-Methyl Methacrylate) or plexiglass

• HTPB (Hydroxyl Terminated Poly-Butadiene) or rubber

• Properties:

• Pros and Cons of HTPB vs. PMMA

Properties HTPB PMMA

Specific Impulse (cp) (J/Kg-K) 2385.93 1466

Density (ρ) (kg/m3) 930 1190Thermal conductivity (Ks) (W/m-K) 0.217 0.17-0.19

Page 3: Hybrid Engines Conventional hybrid vs. “reverse” hybrid 4 Main Components of Hybrid Engine Ignition system Fuel chamber

Cost Evaluation

• PMMA is sold as either extruded or cast – Do = 0.05 m, Di =0.044 m, L = 0.5 m, t = 0.03

m is $202.00

– Do = 0.03 m, Di = 0.024 m, L = 0.5 m, t = 0.03 m is $234.00

• HTPB is a two part mix ($56)– one part thermoset elastomer– one part diisocyanate