Measuring device and measuring method for combustion field double-component synchronous excitation

Abstract

The invention discloses a measuring device and a measuring method for combustion field double-component synchronous excitation, and belongs to the technical field of combustion component visualization. A combustor is arranged in the middle of two laser transmitters, a light beam modulation system and a focusing lens are sequentially arranged between each laser transmitter and the combustor in thelaser transmitting direction, and each light beam modulation system and the corresponding focusing lens are confocal with a combustion field of the combustor. An ICMOS camera is additionally providedwith an interference filter, and the interference filter is matched with the combustion field of the combustor; a pulse signal generator is in signal transmission connection with the two laser transmitters, and a computer is in signal transmission connection with the ICMOS camera. Non-contact measurement is achieved, a flame structure is not interfered, the problem that fluorescence spectral linesof a CH group and an OH group are overlapped under the high-frequency excitation condition is solved, complete synchronization can be achieved in time sequence, the device is simple, cost is saved, and the flame structure and heat release data which can be used for combustion instability mechanism analysis and prediction are provided.

Description

technical field [0001] The invention relates to a measuring device and a measuring method for synchronous excitation of two components in a combustion field, and belongs to the technical field of combustion component visualization. Background technique [0002] Combustion instability refers to the combustion oscillation phenomenon that occurs at or near the sound frequency of the combustion chamber. It is one of the long-standing and very important research topics in the field of combustion. In many studies on combustion instability, the flame dynamics information characterized by a single component is not comprehensive enough to explain the mechanism of combustion instability generation and development. The middle components of the combustion field, CH groups and OH groups, exist in the combustion reaction zone and the high temperature zone respectively, and have been used as tracer groups to characterize the pyrolysis characteristics and flame structure. However, due to t...

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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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