Transient combustion field two-dimensional temperature and concentration measurement method based on three-reflector scanning

Abstract

The invention discloses a transient combustion field two-dimensional temperature and concentration measurement method based on three-reflector scanning, and relates to the field of combustion opticalmeasurement. The method comprises the following steps: 1) adopting sine wave signals with different frequencies and amplitudes to synchronously control a first motion reflector system, a second motionreflector system and a third motion reflector system, enabling the laser to uniformly scan and pass through the measured combustion flow field along with time after three times of reflection, and synchronously recording Raman scattering signals of different components in the flow field excited by the laser by utilizing an image enhancement camera; 2) reading a Raman spectrum scattering signal recorded by the image enhancement camera, and eliminating background noise from the Raman spectrum scattering signal by using an elimination method; and 3) determining the position of each component on the image enhancement camera according to the physical background of Raman scattering and the imaging system, calculating the component concentration and the gas temperature, and controlling the threeplane mirrors to synchronously rotate through three groups of motion servers with different frequencies and amplitudes to achieve the two-dimensional distribution measurement of the concentration andthe temperature of the main components in combustion.

Description

technical field [0001] The invention relates to the field of optical measurement of combustion, in particular to a two-dimensional temperature and concentration measurement method of a transient combustion field based on three-mirror scanning. Background technique [0002] In recent years, with the continuous in-depth research on the mechanism of turbulent combustion process in industrial and production fields such as scramjet, rocket engine and large gas turbine, there is an urgent need to measure the spatial distribution and transient state of combustion intermediate products and flame surfaces. Development Change Engineering. Since the temperature / component concentration of the combustion flame is directly related to the progress of the combustion reaction, combustion efficiency, workability of the power system and the emission of pollutants, it is very important to quantitatively measure the temperature / component concentration. Significance. [0003] Raman scattering t...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the measurement problem of temperature and component concentration field in two-dimensional space in the prior art, and provide a two-dimensional temperature and concentration measurement method of transient combustion field based on three-mirror scanning, through three groups of different frequencies and amplitudes The advanced motion servo controls the synchronous rotation of the three plane mirrors to realize the combustion of the main components (CH 4 ,H 2 O,O 2 ,N 2 ,CO,CO 2 ,H 2 etc.) two-dimensional distribution measurement of concentration and temperature, so as to obtain the two-dimensional distribution and development process of the flame in space, and provide a practical experimental tool for promoting the field of combustion diagnosis and the experimental verification of chemical reaction kinetic models

Images