Combustion Characteristics of Interacting Multiple Jets in Cross Flow

Interactive Combustion in a Linear Array of 2D Laminar Isolated and Triple Burner Jets

“…Interacting jet combustion in cross flow [18] and heat transfer characteristics of impinging multiple jets is also studied [19,20]. Here, the effect of multiple laminar jets on stability is considered.…”

“…Figure 11 shows the ratio of the maximum flame width to the visible flame height as a function of injection Re i for a single 2D jet fired with 100% CH 4 . It is to be noted that parameter ratio W/His used for plotting to reduce property sensitivity.…”

“…It is important to state that partial flames (which occur when Sc < 1 and v x,i > v x,i,crit for S = constant) have not been observed experimentally for CH 4 flames (Sc = 0.74) beyond the critical velocity. Tests conducted by Tillman et al [14] on a linear array of three stainless steel circular burners fired with pure CH 4 showed that neither lift-off height nor partial flame height was observed before blowoff for the CH 4 flames. However, it must be stated that in the case of combustion, S will be strongly affected by temperature and weakly affected by burnt gas composition.…”

“…If M * increases, then row 19 shows that W * /H * decreases which may explain the differences between the theory and the experiment at lower injection Re. Sc for CH 4 used in row 19, was calculated to be 0.74 based on a stoichiometric mixture of CH 4 and air, and all gas properties were evaluated at 700 K. Figure 12 shows the ratio of the axial location where the maximum flame width occurs to the visible flame height as a function of injection velocity for a single 2D jet fired with 100% CH 4 . The solid line on the graph represents the laminar flame theory predictions found in row 21.…”

“…The separation distance between individual burners in many combustion systems is often small enough to cause the flames to interact with one another resulting in a change of flame structure (such as greater flame length and width) and a change in stability characteristics of the flame (such as higher blow-off velocity). Multiple flame interaction also exhibits reduced NO x production [4] under certain conditions. As such, one of the main objectives of combustor design is to maximize flame stability while simultaneously minimizing thermal NO x production.…”