A measuring device and measuring method for simultaneous excitation of two components in a combustion field

Abstract

The invention relates to a measuring device and a measuring method for two-component synchronous excitation of a combustion field, which belong to the technical field of combustion component visualization. The burner is set in the middle of the two laser emitters. Between each laser emitter and the burner, a beam modulation system and a focus lens are arranged in sequence along the laser emission direction. Each set of beam modulation system and the corresponding focus lens are compatible with the burner The confocal setting of the combustion field of the burner; the ICMOS camera is equipped with an interference filter, which is set in conjunction with the combustion field of the burner; the pulse signal generator is connected to the two laser transmitters for signal transmission, and the computer and the ICMOS camera Signal transmission connection. The non-contact measurement of the present invention does not interfere with the flame structure, overcomes the problem of overlapping fluorescent spectral lines of CH groups and OH groups under high-frequency excitation conditions, can achieve complete synchronization in timing, is simple in device, saves cost, and provides a Flame structure and pyrolysis data for combustion instability mechanism analysis and prediction.

Description

Technical field [0001] The present invention relates to a measuring device and a measurement method of bimetimetric synchronous excitation, belonging to the visualization of combustion components. Background technique [0002] Combustion instability refers to one of the long-established and important research topics in the field of combustion, the combustion oscillation in the combustion chamber audio or near the combustion chamber. In many studies in combustion instability, a single set of characterized flame kinetic information is not comprehensive and is not sufficient to explain the production and development mechanism of combustion instability. The intermediate component CH group and OH group in the combustion field are present in the combustion reaction zone and the high temperature zone, respectively, have been used as a tracer group that characterizes thermal release characteristics and flame structure. However, due to the lack of thermal release and flame structure data ...

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Problems solved by technology

[0004] The traditional multi-component measurement is mainly based on the low frequency of 10Hz, and is limited by the fluorescence interference between adjacent bands. The detection timing cannot be completely synchronized (about a hundred nanoseconds of delay), and it is difficult to meet the requirements of the highly dynamic combustion flow field. diagnostic needs

LIFBASE simulations and experiments have confirmed that under high-frequency excitation conditions, the fluorescence lines of the CH C-X band and the OH A-X band will overlap (the CH fluorescence band is around 314nm, and the OH group fluorescence band is around 313nm). Discrimination methods are difficult or almost impossible to achieve full synchronization of detection timing

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