Abstract
Numerical simulation of gas dynamics and combustion in coaxial swirled lifted propane-air jets under buoyancy conditions is performed. Dependences of dimensionless flame length L/d0, lift-off height h/d0 as well as flame front surface area Sfl and mass rate of burn-out U on orientation angle θ are obtained. The results of numerical simulation and experiment for different values of θ are compared. It is confirmed that in the angle range of 30° < θ < 60° flame has the smallest surface area that provides the highest value of the mass rate of burn-out. The numerical solution closest to an experiment data can be obtained by using an additional differential transport equation for the ignition time or setting a delay time in the range of 0.05..0.25 s.
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