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4/08/2003 2
School of Aeronautics and Astronautics
Goals
1) Meet Boundary Condition
477.95O K
2) Minimize TPS Mass
4/08/2003 3
School of Aeronautics and Astronautics
Heat Conduction Problem
1( ) ( ) ( )p
T TC T k T A Q T
t A x x
TPS Material #1
TPS Material #2
TPS Material #j
ConvectionhA(Tinf – TWall) (Type 3)
ChA(ir-iwall) (Type 1)
Time DependantHeat Flux
awAqrad
ReradiationewA(T4
wall – T4rad)
X
4/08/2003 4
School of Aeronautics and Astronautics
SODDIT
Block Data Type
1 Control Flags
2 Title or heading characters
3 Print intervals, print times for results
4 General problem constraints
5 Material property data
6 Initial temp. distribution, node and element data
7 Boundary condition for front face
8 Boundary condition for back face
9 Enthalpy of boundary layer gas
10 Energy generation rate constants
4/08/2003 5
School of Aeronautics and Astronautics
MATLAB & SODDIT
number_of_materials = 3;materials(1) = struct('name','SLA-561V.m', 'thickness',.04,'nodes',15,'ablator',1,'mult',1);materials(2) = struct('name','AETB.m', 'thickness',.01,'nodes',15,'ablator',0,'mult',1);materials(3) = struct('name','Graphite.m', 'thickness',.01,'nodes',15,'ablator',0,'mult',0);
0 0 * *t t t mult scale
4/08/2003 6
School of Aeronautics and Astronautics
SODDIT & MATLAB
Soddit_control.m Soddit_between.m
Mysoddit.m
Get_plt_data.m
SODDIT
Material DataSweep of scale
.qw file
.inp File_plt.txt
Temp HistoryThickness HistoryMaximum Time
Material DataSingle value of scale
.qw file
4/08/2003 7
School of Aeronautics and Astronautics
Code Validation
Physical Characteristic Teflon SLA-561V
Ablation Temp (0K) 822 588
Heat of Formation (J/kg)
2.19e6 5.41e7
Conductivity (W/(m0K)) ≈3 ≈ .2
Teflon
AETB
SLA-561V
Graphite-Epoxy
5cm
2cm
1cm
TPS 1 TPS 2
4/08/2003 11
School of Aeronautics and Astronautics
Test Case
AETB
SLA-561V
Graphite-Epoxy
5cm
2cm
1cm
Completed 600s Mission DurationInner Wall Temp meets 477.95O K Boundary Condition
0 0 * *t t t mult scale
4/08/2003 13
School of Aeronautics and Astronautics
Weight Savings
AETB
SLA-561V
Graphite-Epoxy
2.32 cm
.58 cm
1 cm
Original Density 37.83 kg/m2 Minimized Density 29.2 kg/m2
23% Savings over Reference!!!
4/08/2003 14
School of Aeronautics and Astronautics
.m file Name Short Description
Mysoddit.m Make .inp file, call SODDIT, get results
Soddit_control.m Start here, define TPS and scale values
Soddit_between.m Sweep the scale values, return T_max, Time_Max
Write_block_1.m Writes block 1 data to .inp file
Write_block_2.m Writes block 3 data to .inp file
Write_block_3.m Writes block 3 data to .inp file
Write_block_4.m Writes block 4 data to .inp file
Write_block_5.m Writes block 5 data to .inp file
Write_block_6.m Writes block 6 data to .inp file
Write_block_7.m Writes block 7 data to .inp file
Write_block_8.m Writes block 8 data to .inp file
Fcopy.m Copies one file and appends to another
Findline.m Finds given line in a file and moves file pointer to that location
Create_script.m Creates BSH script to run SODDIT
Get_plt_data.m Get data from _plt file
SLA-561V.m SODDIT data for SLA-561V Ablator
Teflon-Ablate.m SODDIT data for Teflon Ablator
AETB.m SODDIT data for AETB insulator
Graphite.m SODDIT data for graphite-expoy
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