Flame trajectory of a non-vertical turbulent buoyant jet flame

• DOI: 10.1016/j.jaecs.2021.100039
• Publication Date: 2021-07-10T07:26:10Z
• Authors: Wei Gao; Naian Liu; Yan Jiao; Xiaodong Xie; Linhe Zhang
• Keywords: Laminar flame speed; Froude number; Flame speed; Flame structure; Turbulent diffusion

This paper presents a theoretical and experimental study on the flame trajectory of non-vertical turbulent diffusion in still air. A series propane tests (inner diameter burner: d=13 mm) with different initial Froude numbers Fr0 (31.4, 125.5, 282.3, 501.8, 784.1) angles θ0 (60∘, 45∘, 30∘, 15∘, 0∘, −30∘, −45∘) are performed. The motion is physically described based Favre-averaged governing equations. effects buoyancy streamline curvature mixing characterized by length theory. By derivations, Richardson number (Ria) proposed to characterize asymmetry, predictive model coupled effect asymmetry established. Experimental results indicate that under same conditions, first increases then decreases (eventually tends be zero) continuous increase Fr0, gradually decrease θ0. intermittency fitting method temperature normal bi-Gaussian distribution determine asymmetry. These methods validated data. It found near field where curved, peak deviates from midline. In far field, as recovers symmetric, coincide Furthermore, data verify can accurately predict Finally, that, disappears) continuously Comparison between prediction verifies Ria key parameter for