Numerical Study on the Interaction Mechanism between Swirl and Reverse Flow Rate in a Twin Swirl Combustor

Abstract:

An isothermal flow in a Twin Swirl Combustor (TSC) was simulated with the Renormalized Group (RNG) k-ε turbulence model. The swirling and recirculation intensity was studied under different structures and inlet conditions. The results confirmed that there was a significant negative correlation between the trend lines of the swirl number (S) and reversed flow rate (X_r). The gradient of reversed flow rate was larger in the front and middle parts of the combustor than that of swirl number. The end-surface-inlet structure had a better swirl and recirculation enhancement effect. With the end-surface-inlet structure, the internal swirl and reverse intensity could be flexibly adjusted by switching the swirl intensity of the primary air. Under the structure of staggered-inlet, there was a critical distance between primary and secondary air inlets. When exceeded, it would be more difficult to enhance the swirl and reverse flow effect by increasing the swirl intensity of the secondary air.

• Periodical: Advanced Materials Research (Volumes 960-961)
• Pages: 341-348
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.960-961.341
• Online since: June 2014
• Authors: Yin Li Liu*, Hao Tang
• Keywords: Numerical Simulation, Reverse Flow Rate, Swirl Number, Twin Swirl

References

[1] D. Wang, Z. Ma, X. Wang, and L. Zhou, Experimental studies on gas—Particle flows and coal combustion in new generation spouting—Cyclone combustor, Journal of Thermal Science, vol. 5, pp.132-137, (1996).

DOI: 10.1007/s11630-996-0011-0

[2] Z. Qi Li, R. Sun, Z. X. Wan, S. Z. Sun, S. H. Wu, and L. Z. Chen, Gas-particle flow and combustion in the near-burner zone of the swirl-stabilized pulverized coal burner, Combustion Science and Technology, vol. 175, pp.1979-2014, 2003/11/01 (2003).

DOI: 10.1080/714923184

[3] Z. Chen, Z. Li, F. Wang, J. Jing, L. Chen, and S. Wu, Gas/particle flow characteristics of a centrally fuel rich swirl coal combustion burner, Fuel, vol. 87, pp.2102-2110, (2008).

DOI: 10.1016/j.fuel.2007.10.005

[4] R. Weber, F. Boysan, J. Swithenbank, and P. A. Roberts, Computations of near field aerodynamics of swirling expanding flows, Symposium (International) on Combustion, vol. 21, pp.1435-1443, (1988).

DOI: 10.1016/s0082-0784(88)80376-x

[5] R. Weber, B. M. Visser, and F. Boysan, Assessment of turbulence modeling for engineering prediction of swirling vortices in the near burner zone, International Journal of Heat and Fluid Flow, vol. 11, pp.225-235, (1990).

DOI: 10.1016/0142-727x(90)90041-9

[6] A. M. Jawarneh and G. H. Vatistas, Reynolds Stress Model in the Prediction of Confined Turbulent Swirling Flows, Journal of Fluids Engineering, vol. 128, pp.1377-1382, (2006).

DOI: 10.1115/1.2354530

[7] P. Wang, X. S. Bai, M. Wessman, and J. Klingmann, Large eddy simulation and experimental studies of a confined turbulent swirling flow, Physics of fluids, vol. 16, p.3306, (2004).

DOI: 10.1063/1.1769420

[8] Q. Hou and Z. Zou, Comparison between Standard and Renormalization Group k & epsilon; Models in Numerical Simulation of Swirling Flow Tundish, ISIJ International, vol. 45, pp.325-330, (2005).

DOI: 10.2355/isijinternational.45.325

[9] A. Gupta and R. Kumar, Three-dimensional turbulent swirling flow in a cylinder: Experiments and computations, International Journal of Heat and Fluid Flow, vol. 28, pp.249-261, (2007).

DOI: 10.1016/j.ijheatfluidflow.2006.04.005

[10] G. Rocklage-Marliani, M. Schmidts, and V. I. Vasanta Ram Three-Dimensional Laser-Doppler Velocimeter Measurements in Swirling Turbulent Pipe Flow, Flow, Turbulence and Combustion, vol. 70, pp.43-67, (2003).

DOI: 10.1023/b:appl.0000004913.82057.81