Non-contact flame temperature and OH base concentration measuring device and measuring method based on ultraviolet laser absorption spectrum

Abstract

The invention discloses a non-contact flame temperature and OH radical concentration measurement device and a non-contact flame temperature and OH radical concentration measurement method based on ultraviolet laser absorption spectrum. The measurement device comprises an Nd:YAG laser device, a tunable dye laser device, a small-hole diaphragm, a beam splitter, a photoelectric detector I, a photoelectric detector II, a combustor, an oxygen cylinder, a nitrogen cylinder, a fuel cylinder, a flowmeter I, a flowmeter II, a flowmeter III, a premixing tank, an oscilloscope and a computer. Compared with other measurement methods, the measurement method can quantitatively measure the flame temperature and the concentration information of OH free radicals in flame at the same time. Moreover, as the dye laser device has a wide tuning range, the device and the method have a potential for measuring various free radical components in the flame. According to the device and the method, the measurement range of laser combustion diagnosis is expanded and a new technical means is provided for quantitative research on combustion.

Description

technical field [0001] The invention belongs to the field of energy power and optoelectronics, and relates to a flame temperature and component concentration measuring device based on ultraviolet laser absorption spectrum and a method for measuring flame temperature and component concentration using the device. Background technique [0002] Temperature is a physical quantity that characterizes the degree of hot or cold of an object, and it is a macroscopic manifestation of molecular thermal motion. The measurement of temperature can only be measured indirectly through the performance of the external properties of the material as a function of temperature. Flame temperature plays a crucial role in the combustion process, and it is closely related to chemical reaction kinetics, pollutant and dust formation, energy release rate and overall combustion efficiency. In actual combustion systems, such as aeroengines, internal combustion engines, industrial boilers, etc., the flame ...

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Problems solved by technology

The most typical contact measurement is thermocouple temperature measurement, but these methods generally have some inherent shortcomings. Because the flow field is easily disturbed or subjected to adverse interference, the results generally need to be carefully corrected; the application range of measurement is limited, and the scope of use is limited; limited by the size and response speed of traditional physical probes, and lack of sufficient spatial and temporal resolution

Especially in the combustion chamber environment, the characteristics of high speed, high temperature, high pressure, and unsteady state often make traditional diagnostic methods incompetent

The non-contact spectroscopic measurement technology represented by TDLAS usually uses CO 2 , H2O and other combustion products are the main measurement objects, but it is difficult to accurately quantitatively measure flame intermediate products such as OH groups

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