Measurement of Three-Dimensional Temperature Field of Flickering Premixed Flame with and without Coflow

Asymmetric Phenomenon of Flickering Flame Under Different Co-Flow Velocities

“…The calculated results are further verified with the experimental results of flame temperature distribution with d of 24 mm (Fujisawa et al, 2014). This verification case is noted as case B, and the specific conditions are: the diameter of the outer tube (co-flowing inlet) D is 154 mm, the diameter of the inner tube (fuel inlet) d is 24 mm, and the height of the combustion chamber H is 200 mm; the fuel inlet feeds the gas mixture at an equivalence ratio of 1.2, and the fuel inlet velocity uf is 0.22 m/s.…”

“…, 10 where the fitting standard deviation is 1.03%. From the experimental study of Fujisawa et al (2014) and Fujisawa and Okuda (2018), the relation between the dimensionless flickering frequency and Fr is obtained, which is close to the research results in this paper, by which the calculated results are further verified.…”

“…To further verify the calculation method's reliability, the comparison was made with different experimental results. Validation Case A is from Fujisawa's experiment (Fujisawa et al, 2014). As in Table 1, the specific working condition is: the diameter of the outer tube (co-flowing inlet) D is 95.2 mm, the diameter of the inner tube (fuel inlet) d is 11.4 mm, and the height of the combustion chamber H is 200 mm; the fuel inlet feeds the gas mixture with an equivalence ratio φ of 12.32, and the fuel inlet velocity uf is 0.0928 m/s.…”

“…Yoshihara et al (2013) conducted an experimental investigation on flame characteristics under different gravity levels and captured the flickering flame with a high-speed camera. Fujisawa et al (2014) experimentally investigated an axisymmetric premixed methane/air flame under the influence of co-flow using the image analysis and the flame reaction technique, and the results showed different co-flow velocities. Their following research (Fujisawa and Okuda, 2018) focused on the flickering flame with different air co-flow and equivalence ratios and found that the flickering motion weakens at high equivalence ratios.…”

Shadowgraph Imaging of Cavitating Jet

“…The snapshot POD is very useful for recognizing the coherent structure of turbulent flow [8] [9], channel flow [10], flow around a square cylinder [11], flame flickering [12] and highly buoyant jet [13]. By introducing the POD analysis, most energetic structure of the flow is extracted by decomposing the fluctuating properties of the fluid into the linear sum of orthogonal eigenfunctions of temporal and spatial correlations.…”