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Thermophysics and Aeromechanics

2014 year, number 4

In-water gas combustion in linear and annular gas bubbles

V.S. Teslenko, A.P. Drozhzhin, R.N. Medvedev, and I.S. Batraev
Lavrentyev Institute of Hydrodynamics SB RAS, Novosibirsk, Russia
Keywords: heat generator, underwater mover, gas combustion in water, combustion, annular bubble, pulse of force


A new pulsed-cyclic method of in-water gas combustion was developed with separate feed of fuel gas and oxygen with the focus on development of new technologies for heat generators and submerged propellers. The results of calorimetric and hydrodynamic measurements are presented. In-water combustion of acetylene, hydrogen, and propane was tested with the operation frequency of 2–2.5 Hz and with a linear injector. The combustion dynamics of combustion of stoichiometric mixture with propane (C3H8+5О2) was studied for a bubble near a solid wall; the produced gas bubble continues expansion and oscillations (for the case of linear and annular bubbles). It was demonstrated that gas combustion in annular bubbles produces two same-magnitude pulses of force acting on the wall. The first pulse is produced due to expansion of combustion products, and the second pulse is produced due to axial cumulative processes after bubble collapse. This process shapes an annular vortex which facilitates high-speed convective processes between combustion products and liquid; and this convection produces small-size bubbles.