Computational fluid dynamics Analysis

Geometry Details

Mesh Details

Adaptive Sizing
- Resolution set to 6
Nodes: 30973
Elements: 30057

Simulation Details

Transient Pressure Based Simulation

- Viscous Model: K-epsilon model with scalable wall functions
- Species Transport: Non-premixed, Inlet diffusion, C3H8/Air
- Air inlet pressure is increased from 0 to 500 Pascals
- 0.007 kg/s C3H8 mass flow rate
- Combustion chamber walls heated to 1600K
- Time step size is 0.1 s

experiment_edit.m4v

Experimental Results

- Mdot = 0.7 grams/s
- Thrust = 2 lb
- Frequency = 4.17 Hz
- Velocity = 68.1 ft/s

Computational Results

- Mdot = 7 grams/s
- Thrust = 0.083 lb
- Frequency = 2 Hz
- Velocity = 32.7 ft/s

Previous Simulations Using 3d Geometry

Initial CFD.mp4

9102021.mp4

992021.mp4

CFD analysis with 390 m/s pressure inlet boundary condition

Mass fraction of H20 incorrect chemistry pressure output.mp4

Mass fraction of C3h8 incorrect chemistry pressure output.mp4

Absolute pressure incorrect chemistry pressure output.mp4

Velocity 0.001 time step .mp4

temperature 0.001 time step .mp4

Energy 0.001 time step .mp4

Temperature Gradient 0.001 time step .mp4

CFD analysis with 75 m/s velocity inlet boundary condition

temperature with velocity inlet type at t = 0.001 .mp4

Temperature incorrect chemistry pressure output.mp4

total pressure with velocity inlet type at t = 0.001 .mp4

velocity1.wmv

velocity with velocity inlet type at t = 0.001 .mp4

Velocity Streamlines ncorrect chemistry pressure output.mp4

CFD analysis with 390 m/s velocity inlet boundary condition

Scaled_O2_mass_fraction_at_75_ft_s.mp4

Scaled CO2 Mass fraction at 390 ft/s

Scaled_C3H8_mass_fraction_at_75_ft_s.mp4

Scaled C3H8 mass fraction at 390 ft/s

Scaled_Heat_of_reaction_at_390_ft_s.mp4

Scaled scaled heat of reaction at 390 ft/s

Scaled_total_temperature_at_390_ft_s.mp4

Scaled total temperature at 390 ft/s

Initial CFD.mp4

Watch the CFD Analysis

initial CFD Analysis

This is an initial CFD analysis of the pulse jet engine created by one of our team members, Isaiah Dupree. This analysis shows the pressure during operation from 0.00 to 0.01 seconds.

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