Propulsion Systems Design MARYLAND. Rocket engine basics Solid rocket motors Liquid rocket engines. Hybrid rocket engines Auxiliary propulsion systems
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1 Propulsion Systems Design Rocket engine basics Solid rocket motors Liquid rocket engines Monopropellants Bipropellants Propellant feed systems Hybrid rocket engines Auxiliary propulsion systems 2004 David L. Akin - All rights reserved
2 Thermal Rocket Exhaust Velocity Exhaust velocity is where V e = 2γ γ 1 RT 0 M 1 p e p 0 γ 1 M average molecular weight of exhaust R universal gas const.= Joules mole K γ ratio of specific heats 1.2 γ
3 Ideal Thermal Rocket Exhaust Velocity Ideal exhaust velocity is V e = 2γ γ 1 RT 0 M This corresponds to an ideally expanded nozzle All thermal energy converted to kinetic energy of exhaust Only a function of temperature and molecular weight!
4 Thermal Rocket Performance Thrust is T = m V e + ( p e p amb )A e Effective exhaust velocity ( ) A e T = m c c = V e + p e p amb m I sp = c g 0 Expansion ratio A t = γ +1 A e 2 1 γ 1 p e p 0 1 γ γ +1 γ 1 1 p e p 0 γ 1 γ
5 Nozzle Design Pressure ratio p 0 /p e =100 (1470 psi-->14.7 psi) A e /A t =11.9 Pressure ratio p 0 /p e =1000 (1470 psi-->1.47 psi) A e /A t =71.6 Difference between sea level and ideal vacuum V e V e = 1 p e V e,ideal p 0 γ 1 γ I sp,vacuum =455 sec --> I sp,sl =333 sec
6 Solid Rocket Motor From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
7 Solid Propellant Combusion Characteristics From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
8 Solid Grain Configurations From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
9 Short-Grain Solid Configurations From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
10 Advanced Grain Configurations From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
11 Liquid Rocket Engine
12 Liquid Propellant Feed Systems
13 Pressurization System Analysis P g0, V g P gf, V g Adiabatic Expansion of Pressurizing Gas p g,0 V g γ = p g, f V g γ + p l V l γ Known quantities: P L, V L Initial P L, V L Final P g,0 =Initial gas pressure P g,f =Final gas pressure P L =Operating pressure of propellant tank(s) V L =Volume of propellant tank(s) Solve for gas volume V g
14 Boost Module Propellant Tanks Gross mass 23,000 kg Inert mass 2300 kg Propellant mass 20,700 kg Mixture ratio N 2 O 4 /A50 = 1.8 (by mass) N 2 O 4 tank Mass = 13,310 kg Density = 1450 kg/m 3 Volume = m 3 --> r sphere =1.299 m Aerozine 50 tank Mass = 7390 kg Density = 900 kg/m 3 Volume = m 3 --> r sphere =1.252 m
15 Boost Module Main Propulsion Total propellant volume V L = m 3 Assume engine pressure p 0 = 250 psi Tank pressure p L = 1.25*p 0 = 312 psi Final GHe pressure p g,f = 75 psi + p L = 388 psi Initial GHe pressure p g,0 = 4500 psi Conversion factor 1 psi = 6892 Pa Ratio of specific heats for He = 1.67 ( 4500 psi)v 1.67 g = ( 388 psi)v 1.67 g psi V g = m 3 Ideal gas: T=300 K --> ρ=49.7 kg/m 3 (300 psi = MPa) M He =185.1 kg ( ) 1.67 ( ) m 3 ρ He = p g,0m RT 0
16 Space Shuttle OMS Engine From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
17 Turbopump Fed Liquid Rocket Engine From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
18 Sample Pump-fed Engine Cycles From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
19 Gas Generator Cycle Engine From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
20 SSME Engine Cycle From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
21 Liquid Rocket Engine Cutaway From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
22 H-1 Engine Injector Plate
23 Injector Concepts From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
24 Solid Rocket Nozzle (Heat-Sink) From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
25 Ablative Nozzle Schematic From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
26 Active Chamber Cooling Schematic From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
27 Boundary Layer Cooling Approaches From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
28 Hybrid Rocket Schematic From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
29 Hybrid Rocket Combustion From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
30 Thrust Vector Control Approaches From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
31 Apollo Reaction Control System Thrusters
32 Space Shuttle Primary RCS Engine From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
33 Monopropellant Engine Design From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
34 Cold-gas Propellant Performance From G. P. Sutton, Elements (5th ed.) John Wiley and Sons, 1986
35 Nuclear Thermal Rockets Heat propellants by passing through nuclear reactor Isp limited by temperature limits on reactor elements (~900 sec for H2 propellant) Mass impacts of reactor, shielding High thrust system
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