Browse > Article
http://dx.doi.org/10.3795/KSME-B.2017.41.9.623

Effects of Multi-hole Baffle Thickness on Flow and Mixing Characteristics of Micro Combustor  

Kim, Won Hyun (School of Mechanical Engineering, Kyungpook Nat'l Univ.)
Park, Tae Seon (School of Mechanical Engineering, Kyungpook Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.41, no.9, 2017 , pp. 623-629 More about this Journal
Abstract
Flow structure and mixing characteristics in a micro combustor with a multi-hole baffle were numerically studied using the Reynolds stress model. The multi-hole baffle has geometrical features to produce multiple three-dimensional vortices inside combustion chamber. When the thickness of the baffle's geometrical factors changes, variations of vortical structures occur variously. Among these vortices, the vortex generated from the fuel stream exerts a critical influence on the mixing enhancement. The three-dimensional vortical structure, in its development state, was strongly dependent on the baffle thickness. In particular, as the baffle thickness decreases to values less than the diameter of the fuel hole, the jet stream in baffle holes changes from the parabolic to saddleback profile type. The sizes of recirculation zones inside combustion chamber and the mixing state were closely affected by the structure of the jet streams.
Keywords
Baffle Thickness; Recirculating Flow; Mixing Length; Lobed Shape; Secondary Flow;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Chou, S. K., Yang, W. M., Chua, K. J., Li, J. and Zhang, K. L., 2011, "Development of Micro Power Generators-A Review," Applied Energy, Vol. 88, pp. 1-16.   DOI
2 Yahagi, Y., Sekiguti, M. and Suzuki, K., 2007, "Flow Structure and Flame Stability in a Micro Can Combustor with a Baffle Plate," Applied Thermal Engineering, Vol. 27, pp. 788-794.   DOI
3 Choi, H. S., Nakabe, K., Suzuki, K. and Katsumoto, Y., 2001, "An Experimental Investigation of Mixing and Combustion Characteristics on the Can Type Micro Combustor with a Multi-Jet Baffle Plate," Fluid Mechanics and Its Application, Vol. 70, pp. 367-375.
4 Choi, H. S., Park, T. S. and Suzuki, K., 2008, "Turbulent Mixing of a Passive Scalar in Confined Multiple Jet Flows of a Micro Combustor," International Journal of Heat and Mass Transfer, Vol. 51, pp. 4276-4286.   DOI
5 Choi, H. S. and Park, T. S., 2009, "A Numerical Study for Heat Transfer Characteristics of a Micro Combustor by Large Eddy Simulation," Numerical Heat Transfer, Part A, Vol. 56, pp. 230-245.   DOI
6 Kim, W. H. and Park, T. S., 2013, "Numerical Study of Turbulent Flow and Combustion in a Micro Combustor with a Baffle Plate," Journal of Korean Society of Propulsion Engineers, Vol. 17, pp. 20-29.   DOI
7 Kim, W. H. and Park, T. S., 2016, "Effects of Noncircular Air Holes on Reacting Flow Characteristics in a Micro Can Combustor with a Seven-hole Baffle," Applied Thermal Engineering, Vol. 100, pp. 378-391.   DOI
8 Fluent 6.3 User's guide, 2006, Fluent Inc., Lebanon, New Hampshire.
9 Durao, D. F. G., Knittel, G., Pereira, J. C. F. and Rocha, J. M. P., 1991, "Measurements and Modelling of the Turbulent Near Wake Flow of a Disk With a Central Jet," Turbulent Shear Flows 8, Part II, pp. 141-153.
10 Djeridane, T., Amielh, M., Anselmet, F. and Fulachier, L., 1996, "Velocity Turbulence Properties in the Nearfield Region of Axisymmetric Variable Density Jets," Physics of Fluid, Vol. 8, pp. 1614-1630.   DOI
11 Vouros, A. P., Panidis, T., Pollard, A. and Schwab, R. R., 2015, "Near Field Vorticity Distributions from a Sharp-edged Rectangular Jet," International Journal of Heat and Fluid Flow, Vol. 51, pp. 383-394.   DOI
12 Deo, R. C., Mi, J. and Nathan, G. J., 2005, "Dependence of a Plane Turbulent Jet on Its Nozzle Contraction Profile," International Conference on Jets, Wakes and Separates Flows, Paper no. P-058, pp. 183-188.
13 Park, T. S. and Chung, Y. M., 2011, "Turbulent Flow and Scalar Mixing of a Coaxial Injector Having Two Fluid Jets," Numerical Heat Transfer, Part A, Vol. 60, pp. 197-211.   DOI