Identification and measurement method for high-temperature evaporation-type spray schlieren image

Abstract

The invention discloses an identification and measurement method for a high-temperature evaporation-type spray schlieren image. Aiming at a morphological structure that the high-temperature evaporation image is comparatively complicated, a partition processing strategy is adopted; the identification and measurement method comprises the following steps: firstly, detecting a spray liquid phase region and a mixing region by adopting an improved background subtraction edge method; then, detecting a spray steam region and a mixing region by an inter-frame operation edge method; finally, performing post-processing steps of fusion, morphology and the like on the identified regions to obtain the complete outline of a spray evaporation region; subsequently, performing spray characteristic measurement calculation to obtain the quantitative indicator of a spray region. The identification and measurement method disclosed by the invention is capable of identifying and automatically measuring the high-temperature evaporation-type spray image of a premixed combustion-type constant volume bomb, and has the advantages that a threshold value is automatically determined, the processing speed is high, and the accuracy is high, and the like.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engine spray and image processing and recognition, and more specifically relates to a high-temperature evaporation spray schlieren image recognition and measurement method. Background technique [0002] Under the severe reality of decreasing global fossil energy resources and continuous improvement of emission regulations, internal combustion engines are the prime movers of power plants such as automobiles, and energy conservation and emission reduction is one of the main directions of its research. The spray evaporation process of internal combustion engine fuel is the most important factor affecting the combustion and emission process of internal combustion engines. Research on the spray evaporation characteristics of fuel will be very helpful to reduce internal combustion engine emissions and improve internal combustion engine performance. However, the actual injection atomization, ...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a method for identifying and measuring high-temperature evaporation spray schlieren images, the purpose of which is to solve the problems of identification, separation and automatic measurement of spray areas under complex schlieren noise It has high accuracy and processing efficiency, and solves the technical problem that traditional image processing methods cannot identify and process high-temperature evaporation spray schlieren images well.

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