Many practical combustion systems such as residential gas burners contain dense groupings or clusters of jet flames with\r\nsufficiently small spacing between them, which causes flame interaction. The interaction effect, due in part to Oxygen deficiency\r\nin the interstitial space between the flames, causes the spreading of flames, which may merge together to form larger group flames.\r\nThis interactive effect is studied analytically by revisiting the laminar isolated flame theory for 2D jets, for which similarity solutions\r\nare readily available in compressible form, and symmetrical interaction zones can be observed. Flame characteristics were studied\r\nby obtaining analytical expressions for flame specific parameters such as height and width, lift-off height and blow-off velocity, air\r\nentrainment and mixing layer growth. The theory for multiple interacting jets describes an approximate criterion for interburner\r\nspacing at which flame interaction and group flame formation are first observed. The analytical framework presented in this paper\r\npresented in this paper produced results which were compared with experimental measurements. The experimental apparatus\r\nallowed the interburner spacing to be varied from 7.87mm to 50.8 mm, and measurements of flame height, width, lift-off height\r\nand group-flame formation under interactive modes. Images of the evolving flow field were taken and Schlieren images of the\r\nmultiple 2D jets were also recorded using a digital camera.
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