Experimental study of premixed turbulent combustion in opposed streams. Part I—Nonreacting flow field

Velocity and scalar characteristics of premixed turbulent flames stabilized by weak swirl

“…The stabilization mechanism is similar to that of stagnation flow stabilized flames. Flow stagnating against a plate [3) or in opposing streams [8) are two configurations developed for premixed turbulent flame studies. The stagnation flow configurations are constrained because the flow velocity reduces to zero · downstream of the flame zone.…”

Lean premixed opposed jet flames in fractal grid generated multiscale turbulence

“…Similar algorithms have been developed and shown capable of producing excellent agreement with flame fronts obtained using simultaneous CH-LIF/PIV by Steinberg et al [54] or OH/CH 2 O-LIF/PIV by Pfadler et al [55]. The current algorithm was initially validated [22] using images of a silicon oil seeding that evaporates as it passes through the flame front as previously discussed for stagnating flows by Shepherd et al [57], Kostiuk et al [13] and Lindstedt et al [12]. The technique was further validated by Goh et al [28] in the presence of reaction zone broadening by comparing with OH-PLIF images obtained using the Ba(NO 3 ) 2 crystal based technique of Kerl et al [56].…”

“…The axial instability of the flow observed at higher nozzle separations (e.g. [13,17,18]) was effectively removed by the selected H/D (= 1) ratio and further reduced by the presence of a co-flow [10]. The co-flowing stream of air was set to a velocity of ≥10% of the corresponding bulk flow velocity of the reactant mixture in order to reduce the effect of the shear layer that forms between the opposed jet flows and the ambient air.…”

“…Strain effects and extinction and relight characteristics were discussed by Kostiuk et al [13], Mounaïm-Rouselle and Gökalp [14], Sardi and Whitelaw [15], Korusoy and Whitelaw [16] and Luff et al [17] amongst others. Mounaïm-Rouselle and Gökalp [10] and Kostiuk et al [13,18] showed that larger nozzle separations caused a low frequency axial movement made visible by a bouncing of the flame brush. The stabilisation of the flame brush off the symmetry plane of the burner was also noticeable.…”

“…Geipel et al [6], Kostiuk et al [7], Korusoy and Whitelaw [8], Lindstedt et al [9]) and flame structure studies include velocity and scalar field measurements by Mounaïm-Rouselle and Gökalp [10], Kostiuk et al [11] and Lindstedt et al [12]. Strain effects and extinction and relight characteristics were discussed by Kostiuk et al [13], Mounaïm-Rouselle and Gökalp [14], Sardi and Whitelaw [15], Korusoy and Whitelaw [16] and Luff et al [17] amongst others. Mounaïm-Rouselle and Gökalp [10] and Kostiuk et al [13,18] showed that larger nozzle separations caused a low frequency axial movement made visible by a bouncing of the flame brush.…”