Method and device for measuring concentration of substance components in combustion flow field by using laser spectroscopy

Abstract

The invention relates to the measurement of the concentration of the material components in the combustion flow field, and aims to realize multi-component, real-time, on-line and accurate one-dimensional component concentration measurement, with good spatial resolution and wide measurement range. For this reason, the present invention utilizes laser spectrum to measure the method and device of the material component concentration of combustion flow field, utilizes femtosecond laser self-focusing to form filament effect, introduces silk into the combustion flow field of known component concentration, and with the molecular in flow field , atoms interact and emit spectral lines, the spectral spectral lines are recorded by the spectrometer through the ICCD camera with image enhancement function and transmitted to the computer to obtain the component concentration information and the relationship between the equivalent ratio and the spectral spectral line intensity ratio, and obtain Calibration curve; after that, the plasma filament is introduced into the combustion flow field to be measured, and interacts with molecules and atoms in the flow field to emit spectral lines, and is compared with the calibration curve to obtain the one-dimensional concentration distribution and equivalence ratio information of the combustion flow field. The invention is mainly applied to the measurement of the concentration of the substance components in the combustion flow field.

Description

technical field [0001] The invention relates to a technique for measuring the concentration of a substance component in a combustion flow field, in particular to a method for measuring the concentration of a substance component in a combustion flow field by using a laser spectrum. Background technique [0002] The components of substances in the flow field and the corresponding component concentrations are important parameters in the study of flow field motion. For the combustion flow field, the component concentration and fuel-air equivalence ratio of the combustion process (the actual mass ratio of fuel and oxidant divided by the mass ratio of fuel and oxidant during complete combustion) is an important parameter in the mixed gas system, which can be accurately and accurately measured in real time Obtaining the component concentration and equivalence ratio is of great significance for studying the premixing, diffusion, ignition and simulation analysis of the mixed gas. At...

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Problems solved by technology

However, the traditional laser-induced breakdown spectroscopy technology uses nanosecond lasers, which will form a point after being focused by a focusing lens. Therefore, nanosecond laser-induced breakdown spectroscopy technology can only achieve zero-dimensional point measurement. The temporal and spatial resolution is not high, and there will be interference from laser bremsstrahlung when measuring

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