Double direct injection engine flame imaging system and working method thereof

A double-direct-injection engine flame imaging system comprises a compression ignition type optical engine, a rotary driving device, two sets of independent fuel supply injection systems, a first beam splitter, a second beam splitter, a first buncher, a second buncher, a high-speed camera, a computer and an electric control unit. The two sets of independent fuel supply injection systems are respectively connected with the compression ignition optical engine, the first beam splitter, the first buncher and the high-speed camera are arranged at intervals, the second beam splitter is arranged under the first beam splitter, the second buncher is arranged under the middle of the first beam splitter and the first buncher, and the high-speed camera is arranged under the second beam splitter. A first filter is arranged on the lower side face of the second beam splitter, a second filter is arranged on one side face of the second beam splitter, and an endoscope is installed on the side wall of a combustion chamber of th