Pulsed combustion of fuel–air mixture in a cavity above water surface: modeling and experiments

A mathematical model for simulating combustion and detonation of a fuel–air mixture in the gas cavity above the free water surface is developed. The model is based on solving the conservation equations of mass, momentum, and energy for a two-phase reacting gas–water medium with the phases treated as...

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Bibliographic Details
Published in:Shock waves 2022-01, Vol.32 (1), p.1-10
Main Authors: Frolov, S. M., Platonov, S. V., Avdeev, K. A., Aksenov, V. S., Ivanov, V. S., Zangiev, A. E., Sadykov, I. A., Tukhvatullina, R. R., Frolov, F. S., Shamshin, I. O.
Format: Article
Language:English
Subjects:
Acoustics
Combustion
Condensed Matter Physics
Conservation equations
Detonation
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Experiments
Fluid- and Aerodynamics
Free surfaces
Fuel-air ratio
Fuels
Heat and Mass Transfer
Holes
Mathematical models
Mixtures
Original Article
Propellers
Propulsion systems
Thermodynamics
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Summary:A mathematical model for simulating combustion and detonation of a fuel–air mixture in the gas cavity above the free water surface is developed. The model is based on solving the conservation equations of mass, momentum, and energy for a two-phase reacting gas–water medium with the phases treated as interacting interpenetrating continua having their own values of velocity, temperature, and turbulence characteristics. The model is validated by laboratory experiments. The test rig included a transparent cylindrical tube with one closed-end, a pool with an optically transparent window, as well as power, ignition, control, and measurement systems. The tube was vertically immersed with its open end in water and filled with a gaseous explosive mixture. In the experiments, a stoichiometric propane–air mixture was ignited and burned in the semi-closed 60 mL cylindrical volume above the free surface of water. The model is shown to predict satisfactorily the lift force acting on the tube, the time history of pressure in the volume, and the dynamics of the flame and gas–water interface motion during combustion in the volume. The model is intended to be applied for the design of boats with propulsion solely by combustion/detonation of fuel–air mixture in cavities constructed into a bottom surface of the boat. This propulsion system replaces conventional propellers, thereby reducing hydrodynamic resistance.
ISSN:0938-1287
1432-2153
DOI:10.1007/s00193-021-01045-3