天然气预混湍流燃烧特性的实验

In order to gain the premixed turbulent combustion characteristics of natural gas, the premixed turbulent combustion flame propagation characteristics of natural gas at the conditions of the equivalence ratios range of 0.7− 1.4, the initial pressures range of 0.1− 0.3 MPa, the initial temperatures range of 300− 400 K, and the turbulence intensities range of 1.0− 2.7 m/s were experimentally tested in the turbulent combustion bomb. Furthermore, the influences of equivalence ratio, turbulence intensity, initial temperature, and initial pressure on the turbulent flame propagation speed, flame wrinkle ratio and turbulent combustion speed of natural gas were investigated. The results showed that the turbulent flame propagation speeds of natural gas increased and then decreased with the increase of equivalence ratio, and reached the maximum at equivalence ratio of 1.1. With the increase of turbulence intensity and initial temperature, the turbulent flame propagation speed gradually increased. However, with the increase of initial pressure, the turbulent flame propagation speed varied slightly. With the increase of turbulence intensity and initial pressure, or the decrease of equivalence ratio and initial temperature, the flame wrinkle ratio gradually increased. With the increase of equivalent ratio, the turbulent combustion speeds increased first and then decreased, and reached the maximum at equivalent ratio of 1.1. With the increase of the turbulence intensity, initial temperature and pressure, the turbulent combustion speeds gradually increased.