Method for diagnosing various-particle diffusion flame temperature field and concentration field

Abstract

The invention provides a method for diagnosing a various-particle diffusion flame temperature field and concentration field. The method comprises the following steps: 1, calculating the cross length of each detection line and an axisymmetric flame cross section equidistant ring or an asymmetrical flame cross section grid, 2, obtaining the concentration ratio of each metal oxide nanoparticle to thesoot particle by using a TSPD technology, 3, ignoring self-absorption, and regarding the attenuated radiation intensity measured by a CCD camera as non-attenuated radiation intensity to obtain initial values of temperature distribution and particle concentration distribution, 4, calculating attenuated radiation intensity and non-attenuated radiation intensity according to the temperature and concentration distribution fields, 5, acquiring temperature distribution and particle concentration distribution by using an LSQR algorithm under the conditions of non-attenuated radiation intensity and self-absorption, wherein the iteration is carried out from the beginning of the step 4 to the end of the step 6 and is stopped when the maximum change of the temperature distribution of two continuousiterations is less than 1*10<-4> or the number of iterations is greater than 100.

Description

technical field [0001] The present invention relates to a kind of dispersive flame technology of multiple particles, in particular to a method for diagnosing the temperature field and concentration field of a dispersive flame containing multiple particles. Background technique [0002] Metal nanoparticles have a high energy release rate. Adding a small amount of metal nanoparticles to the base liquid fuel can increase its energy density, improve the thermal conductivity of the liquid fuel and the heat transfer performance of the heat exchange system, reduce the ignition temperature of the fuel, and shorten the temperature of the fuel. ignition delay time. In addition, the combustion process of metal nanoparticles will have a local effect of "micro-explosion", which will significantly enhance the local turbulence and promote the complete combustion of fuel. Adding a small amount of metal nanoparticles to diesel engines can not only reduce the consumption of diesel fuel, but ...

AI Technical Summary

Problems solved by technology

But when the medium is a high-temperature flame, there are a series of problems, among which the more prominent problems are: (1) It cannot withstand high temperature, and the thermocouple part exposed to the high-temperature flame is easy to burn or blow off

(2) The measurement probe is easy to disturb the flow field, and may also interact with the gas reaction

(3) The response time is longer, and the resolution of time and space is lower

(4) The measurement range is limited by the size and complexity of the combustion device, so it is difficult to achieve multi-point measurement

However, the acoustic wave method can only obtain one detection data in one measurement on the same path, and requires a certain sound wave propagation time, so its time and spatial resolution are difficult to improve.

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