Optical measuring method and device for spatial distribution of liquid droplets of fuel nozzle

Abstract

The invention discloses an optical measuring method and device for the spatial distribution of liquid droplets of a fuel nozzle. By using a characteristic that aromatic compounds in aviation kerosene can emit red-shift fluorescence signals under the excitation of ultraviolet light with a wavelength of 266 nm, a correction scheme for solving the problem that the measurement errors of spatial distribution of fuel are caused due to the attenuation of laser energy in a droplet cone is designed. The method and device disclosed by the invention are characterized in that the spatial distribution of the liquid droplets in the fuel droplet cone can be quickly and accurately measured, and have an advantage of flow field noninterference, transient and time average results can be obtained, and a deficiency that only an average result can be obtained by a fuel accumulation method is solved. The optical measuring method for the spatial distribution of liquid droplets of a fuel nozzle disclosed by the invention can be used for measuring the spatial distribution characteristics of the liquid droplets in the droplet cone of the fuel nozzle of an aero-engine or an internal combustion engine, and for fuel which does not contain fluorescent components, a tracer agent is required to be added.

Description

technical field [0001] The invention relates to an optical measurement method and device for the spatial distribution of fuel nozzle droplets, in particular to a method for utilizing the fluorescent signal emitted by aromatic compounds in RP-3 aviation kerosene when excited by ultraviolet light with a wavelength of 266nm for the spatial distribution of fuel oil. Optical testing and error correction techniques for measurements. Background technique [0002] The development of advanced gas turbine combustor technology relies on good atomization, rapid and uniform mixing of air and fuel, in this way to avoid adverse conditions for combustion performance, pollutant emissions and engine life. Atomization characteristics such as average droplet size, particle size distribution and spatial distribution of fuel all have a significant impact on the performance of the combustor. [0003] In order to improve combustion efficiency, reduce pollutant emissions and optimize the temperatur...

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Problems solved by technology

However, the PLIF method can only be used for the fog cone with relatively sparse droplet concentration. In the fog cone with relatively large droplet concentration, the laser intensity decreases exponentially along the optical path direction in the test area, resulting in very weak laser intensity at the rear of the test area along the optical path. , therefore, the fluorescent signal at the rear of the test area along the optical path is very weak, causing errors in the measurement of fuel oil distribution

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