丙烷/空气稀薄预混合气流动下的激光点火特性

Based on a flow-ignition platform, laser ignition experiments were carried out on the propane/air lean premixed gas for different equivalence ratios and velocities of flow. The study found that with the increase of the equivalence ratio and velocity of flow, the flame development speed increased and the flame area increased; the CH* luminous intensity in the flame increased significantly with the increase of the equivalence ratio, and the stage of flame development could be judged by the CH* distribution and luminous intensity changes. The probability of successful breakdown and ignition of the mixed-gas increased with the increase of the equivalence ratio and the velocity of flow, but the change of the equivalence ratio had a greater impact on the probability than the velocity of flow; the changes of the content of each component in the mixed gas could be judged by the H/N peak intensity ratio in the breakdown emission spectrum, and the calibration line could determine the equivalence ratio of the unknown premixed gas.