Device and method for measuring flame form and temperature synchronously

Abstract

The invention discloses a device and a method for measuring flame form and temperature synchronously. According to the method, the transient flame form is detected with high-speed schlieren, and the flame temperature is detected with TDLAS (tunable diode laser absorption spectroscopy); detection zones of the high-speed schlieren and the TDLAS are focused in the same detection zone in a constant-volume combustion bomb respectively, the high-speed schlieren and the TDLAS are controlled synchronously by a digital delay generator, and synchronous detection for the flame form and temperature in thetransient flame propagation process is realized. The device comprises the visual constant-volume combustion bomb, a light source, a pinhole diaphragm, an achromatic Fourier transform lens, an adjustable diaphragm, a high-speed camera, a laser, a laser driver, a function generator, an etalon, a reflector, a photoelectric detector, a data acquisition unit and the like. According to the device and the method, the problem about synchronous measurement for the transient flame form and temperature is solved, the clear flame form is obtained with the high-speed schlieren, the high-temporal-resolution flame temperature is obtained with the TDLAS, and combustion characteristics of transient flame are researched through combination of two results of the flame form and temperature.

Description

technical field [0001] The invention relates to the field of optical detection, in particular to the application of a synchronous measurement method combined with high-speed schlieren technology and TDLAS technology in the field of transient combustion process monitoring. Background technique [0002] The internal combustion process of the engine converts the chemical energy in the fuel into heat and mechanical energy, providing the main power of the current human society. Improving engine combustion efficiency and reducing pollutant emissions have always been the unremitting pursuit of scientific research and industrial production. The internal combustion of the engine is a transient process, and its time scale is usually on the order of milliseconds. In order to simulate the transient combustion process inside the engine on this time scale and study its combustion efficiency and pollutant generation, well-known domestic and foreign institutions such as Tsinghua University...

AI Technical Summary

Problems solved by technology

The advantage is the high measurement repetition rate (approximately kHz), the disadvantage is the path integration measurement

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