Appendix to Section 3: Space Shuttle Tile Thermal Protection System. MAE 5420 Compressible Fluids 1
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1 Appendix to Section 3: Space Shuttle Tile Thermal Protection System 1
2 Temperature Versus Heat (1) Often the concepts of heat and temperature are thought to be the same, but they are not. Temperature is a number that is related to the average kinetic energy due to the random motion of each molecule of a substance. In Kelvin degrees, T is directly proportional to the average kinetic energy of the molecules. Heat is a measurement of the total energy in a substance. That total energy is made up of not only of the kinetic energies of the molecules of the substance, but total energy is also made up of the potential energies of the molecules. 2
3 Temperature Versus Heat (2) When heat, (i. e., energy), goes into a substance one of two things can happen: 1. The substance can experience a raise in temperature. That is, the heat can be used to speed up the molecules of the substance. 2. The substance can change state. For example, if the substance is ice, it can melt into water. This change does not cause a raise in temperature. The energy is used to change the bonding between the molecules. Ablative heat shields use this principal to protect reentering spacecraft 3. The degree of temperature change for a given heat input (loss) is the Heat Capacity 3
4 Aerodynamic Heating on a Body t C.V. ρ e + V 2 2 dv e + V 2 + ρv > > d S = C.S. (ρ > f dv) V > (pd > > S ) V C.V. + ρ q C.S. C.V. 2 dv 4
5 Hypersonic Vehicle Design (cont d) Heating vs. performance (Hypersonic Aerodynamics) Heating is Minimized by Blunt Body.. But so is Lift-to-Drag ratio Detached Normal Shockwave On Blunt Leading Edge Dissipates significant Portion of heat into flow But Also.. Produces High level of Drag Heating proportional to 1/R le 1/2 5
6 Ablation Example - Heat shield consisting of phenolic resin in a metal honeycomb At high heat flux, resin - Material decomposes via pyrolysis absorbing heat - Products form a barrier between hot gasses and spacecraft structure - Surface temperature remains low Laub, B. Thermal Protection Technology and Facility Needs for Demanding Future Planetary Missions, NASA Ames Research Center, October
7 Hypersonic Vehicle Design (cont d) Sharp leading Edge has very high heating But Much Lower Hypersonic Supersonic Lift-to-Drag M M2 Flow attached at leading edge Heating impinges directly Oblique Shockwave More Exotic Thermal Protection Systems Required 7
8 Thermal Soak Space Shuttle Thermal Protection System soaks up heat and stores it internally due to its very high heat capacity and low thermal conductivity 8
9 Thermal Soak (2) Space Shuttle Thermal Protection System (TPS) soaks up heat and stores it internally due to TPS very high heat capacity and low thermal conductivity 9
10 Thermal Soak (3) HSRI Shuttle Tile (High Temperature Reusable Surface Insulation) One of the best heat soaks in the world Silica (SiO 2 ) Mostly made up of empty space 10
11 Thermal Soak (4) Density kg/m 3 (9 lb/ft 3 LI-900) kg/m 3 (22 lb/ft 3 LI-2200) Specific heat KJ/kg-K (0.15 BTU/lb- o F) Thermal conductivity W/m-k (0.028 BTU/ft-hr- o F) at 21 o C) W/m-k (0.073 BTU/ft-hr- o F at 1093 o C) Maximum reuse temperature >1260 o C Maximum single use temperature Reusability at 2300 o F 1538 o C >100 missions 11
12 Compare Shuttle Tile Thermal Conductivity to Conventional Materials Thermal Material conductivity W/(m K) Shuttle Tile (LI-900) Air Rubber 0.16 Thermal grease Thermal epoxy 1-7 Glass 1.1 Concrete, stone 1.7 Sandstone 2.4 Stainless steel ~ 45.0 Lead 35.3 Aluminium 220 (pure) (alloys) Gold 318 Copper 380 Silver 429 Diamond More or Less Only Air is a better insulator (except for exotic materials like aero gels) a copper penny conducts heat almost 7000 Times faster than a shuttle tile 12
13 What Happens as Shuttle Tile is Heated? heat transfer rate per unit area 13
14 What Happens as Shuttle Tile is heated? (2) Because thermal conductivity of shuttle tile is so low heat is radiated back from the surface faster than it is absorbed into the body --- Assume 1260 C surface temperature C interior wall temperature cm thick tile Always work in absolute temperature units = W/cm 2 Tile radiates back 180 times more heat than it Conducts into the structure! = W/cm 2 heat transfer rate per unit area 14
15 Thermal Soak (Revisited) Space Shuttle Thermal Protection System soaks up heat and stores it internally due to its very high heat capacity and low thermal conductivity 15
16 What Happens as Shuttle Tile is heated? (3) But the Shuttle Tiles Still Stored a Lot of Heat That Had to be Removed Post Landing! 16
17 What Happens as penny is heated? heat transfer rate per unit area = W/cm 2 Penny would conduct almost 1000 times more heat into structure! = 29,893 W/cm 2 Ouch! 17
18 What Happens when a penny is heated? (2) Wall gradient is rapidly neutralized and whole penny heats up no insulation properties at all heat flux 18
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