A flame temperature field measurement device and method based on projection background schlieren technology

Abstract

The present invention relates to the technical field of flame temperature measurement, and more specifically, provides a flame temperature field measurement device and method based on projected background schlieren technology, using the projected background schlieren technology, based on the principle of air refractive index gradient measurement, Using a semiconductor laser as the light source, the laser beam is shaped into a conical beam by a beam expander, and then divided into two beams by a beam splitter. The reflected beam irradiates the convex lens and enters the test area. The light is disturbed by the change of the refractive index of the flow field. The schlieren image can be directly presented on the projection light screen, realizing the projection visualization of the background schlieren. Then use high-speed CCD fast imaging, combine S-EYE and PIV technology on the PC side to obtain the offset of the particles on the image to quantify the deflection angle, and then use the back-projection reconstruction principle to perform three-dimensional reconstruction of the uneven temperature field to obtain the entire flame area The temperature change trend can realize the visual measurement of the transient flame temperature field, replacing the traditional single-point temperature measurement.

Description

technical field [0001] The present invention relates to the technical field of flame temperature measurement, and more specifically relates to a flame temperature field measurement device and method based on projected background schlieren technology, which is applied to transient combustion process monitoring. Background technique [0002] The measurement of flame temperature field is an extremely important problem in the field of combustion, and it is of great significance to the judgment, prediction and diagnosis of combustion state. Accurate, real-time and rapid measurement of the flame temperature field is achieved through non-contact means, and it is widely used in industry, military, aerospace and other fields. The research on the measurement method of flame temperature field has always been a hot issue in the field of combustion at home and abroad. Non-contact temperature measurement methods are divided into two categories: one is to solve the temperature by measurin...

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Problems solved by technology

With the continuous improvement of living standards, in our daily life, only measuring the temperature of a single point of an object often cannot meet people's needs, because sometimes people need to obtain the temperature change trend of the entire area in time and hope to observe the phenomenon quickly and intuitively , therefore, it is more meaningful to design an experimental device for measuring flame temperature with a non-contact schlieren instrument that is cost-effective, easy to operate, and portable

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