In-situ measurement system and method of combustion field velocity based on laser-induced plasma

Abstract

The invention discloses a system and a method for in-situ measuring the flow velocity of a combustion field based on laser-induced plasma, which includes a working cabin, wherein a single-pulse all-solid-state laser, a focusing optical path, a collecting optical path, a dual-channel spectrometer, a DG535 time sequence controller and an electronic control module are arranged in the working cabin. The single-pulse all-solid-state laser is used for emitting pulsed laser to the focusing optical path. The focusing optical path is used for receiving the pulsed laser and focusing on a target burning flame position to excite a flame to generate laser-induced plasma. The collecting optical path is used for receiving the plasma signal light and collecting the plasma images and spectrum. Considering the in-situ measurement requirements of a complex combustion environment, the invention establishes a laser-induced plasma flow field velocity inversion method, overcomes the problems of poor signal quality, difficult on-line in-situ measurement and provides a new idea for non-contact rapid measurement inversion of the high-velocity flow field.

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