Comparative study of the effects of ignition location on the flame propagation characteristics and spectral properties of a methane–air premixed gas in a vertical pipeline

Qiuhong Wang, Qiuhong Wang, Yuchen Yan, Songping Yang, Chi‐Min Shu, Juncheng Jiang, Qingfeng Wang, Qingfeng Wang, Chengfeng Yu, Leilei Zhu