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Updated: Jan 17, 2026

07:58
Improving the Combustion Performance of a Hybrid Rocket Engine using a Novel Fuel Grain with a Nested Helical Structure
Published on: January 18, 2021
6.5K
Demonstration of fuel PLIF in a model solid fuel ramjet combustor
Applied Optics
|September 22, 2025
Summary
This study advances solid fuel ramjet technology by measuring fuel vapor composition using fluorescence imaging. Results aid in calibrating pyrolysis models and understanding ignitability for improved engine performance.
Area of Science:
- Combustion Science
- Aerospace Engineering
- Chemical Engineering
Background:
- Solid fuel ramjet (SFRJ) deployment is limited by challenges in characterizing fuel decomposition and performance.
- Understanding fuel vapor dynamics is crucial for calibrating pyrolysis models and assessing ignitability.
Purpose of the Study:
- To measure relative fuel mixture fraction in an SFRJ engine using fluorescence imaging.
- To investigate the impact of pressure and temperature on fuel vapor composition.
- To validate computational fluid dynamics (CFD) models against experimental data.
Main Methods:
- Utilized ultraviolet laser-induced fluorescence imaging to quantify monomeric butadiene and hydrocarbon fuel fractions.
- Conducted experiments across various pressure and temperature inflow conditions.
- Performed 2D Large Eddy Simulations (LES) and 3D Reynolds-Averaged Navier-Stokes (RANS) simulations with species transport and coupled gas-solid boundary conditions.
Main Results:
- Observed a monotonic increase in fuel composition with rising combustor temperature.
- Identified a self-similar profile of relative mixture fraction across different pressures, with deviations attributed to vortex shedding.
- Numerical simulations showed good agreement with experimental data, though LES overpredicted and RANS underpredicted fuel transport.
Conclusions:
- Fluorescence imaging provides a viable method for characterizing fuel vapor in SFRJ engines.
- Experimental and simulation results offer insights into fuel pyrolysis and combustion dynamics.
- Further refinement of CFD models is needed to accurately capture fuel transport phenomena.
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