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Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Thermal Protection Systems• Comments on term project• Comments on problem set 2• ermal heating analysis
• One-dimensional flows• Finite difference formulation• Multidimensional heat flows
• Heat shields
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© 2012 David L. Akin - All rights reservedhttp://spacecraft.ssl.umd.edu
Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Term Project - Top Level Requirements• Design a system to allow the construction of one
10GW SPS per year– Launch vehicle(s) for cargo and personnel– Crew-carrying spacecra– On-orbit transportation infrastructure– Assembly base(s) siting analysis– Spacecra launch abort and EDL systems
• Mission models– 4000 MT/year for SPS components– All other logistics over and above SPS payloads
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Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
The Canonical Planar State Equations
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Coupled first-order ODEs
vγ =L
m−
�1− v2
v2c
�g cos γ
v = −D
m− g sin γ
r = h = v sin γ
rθ = v cos γ
r
v
L
m
D
m
θ
γ ω
Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Associated Parameters to State Eqns
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L
m=
1
2
ρv2AcLm
=ρv2
2
AcDm
cLcD
=ρv2
2β
L
D
D
m=
1
2
ρv2AcDm
=ρv2
2β
ρ = ρoe− h
hs
h = r − ro
g = go�ror
�2=⇒ g =
µ
r2
vc =
�µ
rxdownrange = roθ
Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Mercury Heat Shield Section
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Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Gemini MOL Heat Shield
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Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Apollo 11 Heat Shield
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Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Orion Heat Shield
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Phenolic Impregnated Carbon Ablator (PICA)
Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Galileo Jupiter Probe Heat Shield
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Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Heat Shield Internal Structure
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Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Shuttle Tile Installation
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Thermal Protection SystemsENAE 791 - Launch and Entry Vehicle Design
U N I V E R S I T Y O FMARYLAND
Inflatable Heat Shield (Suborbital Test)
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