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In the 1arge utility burner, tangential circle characteristic of multiangular bumers is important guideline of burner . Through the experiments on the cold model test, the paper reports the tangential circle characteristic on high ratio of Iengtli and width, rectangle fumace and hexagonal arranged burners, and analyses the inner rule quantificationally. Contact circle has retation, periodicity; time averaging and crumbliness, andjet fiow swing has periodicity with the periodicity oftangential circle.

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