chap4_13_19

# chap4_13_19 - AAE 439 4.2 THERMODYNAMICS Review Ch4 13 AAE...

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Ch4 – 13 AAE 439 4.2 THERMODYNAMICS - Review

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Ch4 – 14 AAE 439 ENERGY & WORK Rocket Motor Functions Chemical rocket performance comprises two primary parts: Thermodynamics define relationships between forms of energy. Isentropic relations describe the flow in the nozzle. Total Energy Total Work Enthalpy Continuity Specific Heat Form of Energy Kinetic Energy e = u + e potential + e kinetic dw = dw shaft + dw flow h u + p v u + p ρ c v du dT v = const . c p dh dT p = const . γ c p c v m = ρ A v
Ch4 – 15 AAE 439 LAWS OF THERMODYNAMICS 1 st Law of TD (Energy Equation) Expresses the universal law of conservation of energy. No-work reversible interaction 2 nd Law of TD (Entropy) Expresses the universal law of increasing entropy. No work reversible interaction 1 st & 2 nd Laws of TD de = dq dw dh + v dv = dq dw shaft e pot = const . de pot = 0 dq rev = du + p dv = dh v dp = dh + v dv ds dq T ds = dq T

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