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Comsol MP in Rocket Technology
A wide range of applications
Comsol MultiPhysics in Rocket
Technology
Defense, Security and Safety
Presented at the COMSOL Users Conference 2006 Eindhoven
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How is Comsol MP used in Rocket Technology
Disciplines: Mechanical analyses
Thermal analyses Chemical processes
CFD
Examples: Spinning Ramjet Projectile
Micro-thruster
Catalytic Decomposition (Sc)ramjet vehicle performance
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Example 1: Spinning Ramjet Projectile
Gun launched
Auto-igniting
Sustains Mach 4
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Spinning test set-up
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Intake and fin CFD
Aerodynamic forces on fins
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Structural loading
Periodic boundary conditions
Aerodynamic surface forces
Centrifugal volume forces
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Example 2: Micro-thruster
Thrust < 1 N
Monopropellant: H2O2
V nano-satellites, ACS micro-satellites Testbed for hybrid
manufacturing.
(micro-machining
and MEMS)
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Thermal analysis, step one: detailed 2D
Heat load from catalyst bed
from inside
Radiation and possibleconvective cooling on outside,
corrected for surface ratio
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Thermal analysis, step two: simplified 2D
Catalyst bed ring and support structure removed
Equivalent heat load at point c applied to boundary b1
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Thermal analysis, step three: 3D
Equivalent heat load on simplified 2D model
reproduces detailed 2D results apply this
heat load in a simplified 3D model
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Thermal losses estimation
0 10 20 30 40 50 60 70 80 90 10090
100
110
120
130
140
150
160
170
SpecificImp
ulse(s)
time (s)
nominal mass flow
maximum mass flow
theoretical maximum
preliminary design nominal
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Example 3: Catalytic Decomposition
Start-up performance of catalytic
decomposition of a mono-propellant.
Application modes used:
Brinkman porous flow
Heat conduction
Convection and Conduction Convection and Diffusion (2 species)
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Example 3: Catalytic Decomposition
Inflow of propellant from the top.
As soon as decomposition starts, the velocity increases
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Example 3: Catalytic Decomposition
Velocity Decomposition Structural
Temperature
Fluid
Temperature
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Example 4: (Sc)ramjet vehicle performance
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Ramjet intake operation
Slightly super-criticalSlightly sub-critical
Transition effects
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Scramjet vehicle with Singe Expansion Ramp Nozzle
Temperature
Pressure
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Ramjet start-up
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... and many more to come ...