Numerical investigation of low-velocity filtration combustion instability based on the initial preheating non-uniformityYongfang Xia, Tingyong Fang, Haitao Wang, Erbao Guo and Jinwei MaE3S Web Conf., 136 (2019) 02040DOI: https://doi.org/10.1051/e3sconf/201913602040