Back
 OJFD  Vol.7 No.3 , September 2017
Computational Study on Aerodynamic and Thermal Characteristics of a Hot Jet in Parallel Flow
Abstract:
The study of the migration characteristics of turbulent jets has become relevant as they are used in a variety of engineering devices and are encountered in combustion, chemical processes, and processes involving cooling, mixing, and drying. In several applications, especially in the case of hot streaks in gas turbines, the knowledge of mixing phenomena becomes crucial from a design perspective. The purpose of this study is to look into the characteristics of a round hot jet in a parallel air flow. A jet of hot air injected through a nozzle into a flow of cold air has been considered. Numerical simulations were carried out with different hot jet temperatures and two different Reynold’s numbers, thus aiming at understanding the effect of initial conditions on the mixing of the jet. The temperature profiles were studied at different sections downstream of the nozzle. The results are presented in non-dimensional form.
Cite this paper: Das, M. , Jungio, M. , Haritha, N. , Suryan, A. and Kim, H. (2017) Computational Study on Aerodynamic and Thermal Characteristics of a Hot Jet in Parallel Flow. Open Journal of Fluid Dynamics, 7, 348-358. doi: 10.4236/ojfd.2017.73023.
References

[1]   Karimipanah, T. (1996) Turbulent jets in Confined Spaces? Application in Mixing Ventilation, Experimental and Numerical Studies. Ph.D. Thesis, Royal Institute of Technology, Sweden.

[2]   Sekula, E. (2010) The Structure of Turbulent Jets: Application of Experimental and Environmental Methods. Ph.D. Thesis, Universitat Politecnica de Catalunya, Barcelona.

[3]   Zhao, Q., Wang, H., Tang, F., Zhao, X. and Xu, J. (2008) Investigation of Influencing Factors of Hot Streaks Migration in High Pressure Stage of a Vaneless Counter-Rotating Turbine. Science in China Series E: Technological Sciences, 51, 127-144.
https://doi.org/10.1007/s11431-008-0024-x

[4]   Karimipanah, T. and Sandberg, M. (1994) Decay of Momentum and Velocity in an Axisymmetric Impinging Jet. Proceedings of 4th International Conference of Air Distribution in Rooms, Krakow, 15-17 June 1994, Vol. 1, 400-411.

[5]   Carlomagno, G.M. and Ianiro, A. (2014) Thermo-Fluid-Dynamics of Submerged Jets Impinging at Short Nozzle-to-Plate Distance: A Review. Experimental Thermal and Fluid Science, 58, 15-35.

[6]   Plesniak, M.W. and Cusano, D.M. (2005) Scalar Mixing in a Confined Rectangular Jet in Crossflow. Journal of Fluid Mechanics, 524, 1-45.
https://doi.org/10.1017/S0022112004001132

[7]   Antonia, R.A. and Zhao, Q. (2001) Effect of Initial Conditions on a Circular Jet. Experiments in Fluids, 31, 319-323.
https://doi.org/10.1007/s003480100289

[8]   Suryan, A., Lee, J.K., Kim, D.S. and Kim, H.D. (2010) Numerical Simulation of Duct Flow with Fog Droplets. Journal of Thermal Science, 19, 533-539.
https://doi.org/10.1007/s11630-010-0420-y

[9]   Jenkins, S.C. and Bogard, D.G. (2005) The Effects of the Vane and Mainstream Turbulence Level on Hot Streak Attenuation. Journal of Turbomachinery, 127, 215-221.
https://doi.org/10.1115/1.1812777

[10]   Jenkins, S., Varadarajan, K. and Bogard, D.G. (2004) The Effects of High Mainstream Turbulence and Turbine Vane Film Cooling on the Dispersion of a Simulated Hot Streak. Journal of Turbomachinery, 126, 203-211.
https://doi.org/10.1115/1.1643911

[11]   Qureshi, I., Smith, A.D., Chana, K.S. and Povey, T. (2012) Effect of Temperature Nonuniformity on Heat Transfer in an Unshrouded Transonic HP Turbine: An Experimental and Computational Investigation. Journal of Turbomachinery, 134, 011005.
https://doi.org/10.1115/1.4002987

[12]   Abdel-Rahman, A. (2010) A Review of Effects of Initial and Boundary Conditions on Turbulent Jets. WSEAS Transactions on Fluid Mechanics, 5, 257-275.

[13]   Mi, J., Xu, M. and Zhou, T. (2013) Reynolds Number Influence on Statistical Behaviors of Turbulence in a Circular Free Jet. Physics of Fluids, 25, 075101.
https://doi.org/10.1063/1.4811403

[14]   Satta, F. and Tanda, G. (2016) Aerodynamic and Thermal Characteristics of a Hot jet in Parallel Flow. Journal of Applied Fluid Mechanics, 9, 2105-2110.
https://doi.org/10.18869/acadpub.jafm.68.236.25087

 
 
Top