New High-Speed Spectral Infrared Imaging Device Applied for Flame Studies

摘要

A high-speed spectral infrared imaging system has been developed for facilitatinginvestigation of thermal processes, including those in combustion devices. The new system has several unique performance characteristics: variable and high speed frame rate; variable and short exposure period; independent control of imaging parameters; digital imaging in high dynamic resolution; spectral imaging; externally triggered individual images; and large number of frames per each data acquisition. Its design and performance verification was made by obtaining instantaneous thermal images that permit visualization of reaction fronts and subsequent mixing of combustion products in a Bunsen burner, a rectangular Poiseuille-flow burner, and a spark-ignition engine. Some of results from this work are compared with those obtained using conventional methods reported in literature. It is demonstrated that new findings, otherwise difficult to obtain, have been made possible by this newly developed tool.... High-speed, Short exposure period, Digital data, Infrared spectral, Flames, Combustion devices.