A Laser Absorption Spectroscopy Combustion Diagnosis Method Based on Time-Averaging Characteristics of Turbulent Flames
A technology of laser absorption spectroscopy and absorption spectroscopy, which is applied in the field of combustion diagnosis, can solve problems such as the inability to eliminate the influence of turbulent flow fluctuations and measurement results errors, and achieve the effect of accurate and reliable absorption spectroscopy measurement and wide application prospects
Active Publication Date: 2021-12-07
SICHUAN UNIV
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However, the quasi-steady-state assumption and axisymmetric assumption of this scheme are not actually valid, and because the spectral line intensity is a nonlinear function of temperature, in theory, the arithmetic mean cannot eliminate the influence of turbulent fluctuations, ignoring the influence of turbulent fluctuations on the absorption The influence brought by the spectral signal will inevitably introduce errors in the measurement results
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] see Figure 1-Figure 5, this example selects the measurement of the heat-following turbulent jet flame for analysis. According to the implementation steps of the present invention, this embodiment selects 4029.524cm -1 、4030.728cm -1 as a measurement line. Firstly, the turbulent fluctuations are simulated for the selected absorption lines. As a note, figure 1 shows the impact on the time-average line strength after the introduction of...
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The invention discloses a laser absorption spectrum combustion diagnosis method for the time-averaged characteristics of turbulent flames. By collecting time-averaged signals of a specific duration for turbulent flames and considering the influence of turbulent fluctuations, corresponding corrections are made in the data processing stage, thereby Obtain accurate time-averaged absorption spectrum signals, and then invert reliable time-averaged characteristic information of turbulent flames, effectively improving the accuracy of measuring turbulent flames using laser absorption spectroscopy. By considering the influence of turbulent pulsation in turbulent flame, the present invention establishes the relationship between absorption turbulence correction and turbulent pulsation, and can solve the corresponding pulsation amplitude while solving temperature, concentration and pressure parameters, and can obtain more accurate and more Comprehensive turbulent flame time-averaged measurement data, and because the turbulence correction table can be constructed in advance and can be reused, the post-processing speed is not significantly different from the current scheme. The general turbulent flow and the turbulent influence in the atmosphere are both The scheme of the present invention can be adopted.
Description
technical field [0001] The invention relates to the technical field of combustion diagnosis, in particular to a laser absorption spectrum combustion diagnosis method of time-averaged characteristics of turbulent flames. Background technique [0002] Turbulent flame is the most common combustion process in energy power devices such as daily life, transportation, industrial production and aerospace. This process is often accompanied by complex chemical reactions, heat and mass transfer and fluid transport phenomena. Realizing reliable and accurate measurement of turbulent flame has important scientific significance and engineering value. With the continuous development of scientific needs and sensor technology, laser absorption spectroscopy has been widely used in the field of combustion diagnosis in the past forty years due to its many advantages such as non-contact, calibration-free, fast response, low measurement cost and easy integration. A large number of absorption spec...
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IPC IPC(8): G01N21/39F23M11/04
CPCF23M11/045
Inventor 张健鹏马柳昊任伟段锟
Owner SICHUAN UNIV