Abstract
The initial conditions such as temperature, pressure and dilution rate can have an effect on the laminar burning velocity of natural gas. It is acknowledged that there is an equivalent effect on the laminar burning velocity between any two initial conditions. The effects of initial temperatures (323 K–423 K), initial pressures (0.1 MPa–0.3 MPa) and dilution rate (0–16%, CO2 as diluent gas) on the laminar burning velocity and the flame instability were investigated at a series of equivalence ratios (0.7–1.2) in a constant volume chamber. A chemical kinetic simulation was also conducted to calculate the laminar burning velocity and essential radicals’ concentrations under the same initial conditions. The results show that the laminar burning velocity of natural gas increases with initial temperature but decreases with initial pressure and dilution rate. The maximum concentrations of H, O and OH increase with initial temperature but decrease with initial pressure and dilution rate. Laminar burning velocity is highly correlated with the sum of the maximum concentration of H and OH.
Highlights
Natural gas, of which the major constituent is methane, is regarded as a promising alternative fuel with excellent prospects owing to its huge quantity, cleaner emissions and high thermal efficiency [1,2,3].In order to reduce the emissions and to improve engine performance, combining hydrogen-natural gas blending fuel with exhaust gas recirculation (EGR) [4,5,6,7,8] is a feasible approach
The results show that the laminar burning velocity of dissociated methanol-air mixture increases with
By using a constant volume chamber, Miao et al [16] studied the influence of fuel-air equivalent ratio, hydrogen-doping ratio and dilution degree on the laminar burning velocity and Markstein length for the hydrogen-mixed natural gas-air-diluted gas
Summary
Of which the major constituent is methane, is regarded as a promising alternative fuel with excellent prospects owing to its huge quantity, cleaner emissions and high thermal efficiency [1,2,3]. By using a constant volume chamber, Miao et al [16] studied the influence of fuel-air equivalent ratio, hydrogen-doping ratio and dilution degree on the laminar burning velocity and Markstein length for the hydrogen-mixed natural gas-air-diluted gas. The addition of diluent gas slows down the chemical reaction rate of the mixture, resulting in a decrease in flame propagation speed and burning velocity; The increase of the initial temperature of the constant volume chamber will promote the chemical reaction rate of the mixed gas, while the increase of the initial pressure will inhibit the chemical reaction rate of the mixed gas. The effect of initial conditions (initial temperature, initial pressure, dilution ratio and equivalence ratio) on burning characteristics (laminar burning velocity, flame instability, flame structure and concentration of essential radicals) are investigated comprehensively
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