Effects of Hybrid Diffuser in Axial-Flow Jet Engine Combustor
Main Article Content
Abstract
It is believed that the turbine engine plays a vital role in the performance of aircraft. Most jet engines nowadays use the axial compressor. In axial-flow compressors, the rising pressure through each stage is dependent on the axial flow velocity. A high axial velocity is essential to achieve the design pressure with the minimum number of stages. Thus, before the combustion can proceed, the air velocity must be reduced to about 20% of the compressor outlet velocity. This depletion is accomplished by fitting a diffuser between the compressor outlet and the upstream end of the liner. Throughout much research into diffuser performance, it has been shown that the operation depends particularly on the flow. Besides, there are several problems that could result in the loss of its efficiency. This study will focus on increasing the diffuser performance of a hybrid type one via pressure-recovery coefficient C_p and loss coefficient λ.
Keywords
Jet engine combustion, Hybrid diffuser, RANS analysis, Diffuser performance
Article Details
References
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[10] A. D. Walker, P. A. Denman, and J. J. McGuirk, Experimental and computational study of hybrid diffusers for gas turbine combustors, Journal of Engineering for Gas Turbines and Power, vol. 126(4), 2004, pp. 717–725. https://doi.org/10.1115/1.1772403
[11] S. Obi, K. Aoki, and S. Masuda, Experimental and computational study of turbulent separating flow in an asymmetric plane diffuser, In Proc. 9th Symposium on Turbulent Shear Flows, 1993, pp. 305–312.
[12] ANSYS CFX 19.1 (2018) ANSYS CFX-Solver Theory Guide. ANSYS Inc.
[13] V. Chandavari and M. S. Palekar, Diffuser angle control to avoid flow separation, International Journal of Technical Research and Application, vol. 2(5), 2014, pp. 16-21.
[2] S. J. Stevens and G. J. Williams, The Influence of inlet conditions on the performance of annular diffusers, ASME. J. Fluids Eng., vol. 102(3), 1980, pp. 357–363. https://doi.org/10.1115/1.3240694
[3] F. Liepe, Efficiency of slender conical diffusers with the swirling flow, Maschineribautechnik, vol. 4, No. 8, 1960, pp. 405–412.
[4] A. M. Elkersh, A. H. Elgammal, and N. R. L. Maccallum, An experimental investigation of the performance of equiangular annular diffusers with swirled flow, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, vol. 199(4), 1985, pp. 293-297, https://doi.org/10.1243/PIME_PROC_1985_199_126_02
[5] M. Hanna, A. El-Kersh, R. Bassiouny, M. Gomaa, Air flow characteristics in an asymmetric plane diffuser under different inlet conditions, MJET, Minia Univ., El-Minia, Egypt, 2008.
[6] R. C. Adkins, D. S. Matharu, and J. O. Yost, The hybrid diffuser, ASME. J. Eng. Power, vol. 103(1), 1981, pp. 229–236. https://doi.org/10.1115/1.3230702
[7] A. J. Juhasz, Performance of a short annular dump diffuser using wall trailing-edge suction, NASA Technical Report, NO. NASA-TM-X-3093, 1974.
[8] A. J. Verdouw, Performance of the vortex-controlled diffuser (VCD) in an annular swirl-Can combustor flow path, in A. H. Lefebvre, ed., Gas turbine design problems, Hemisphere, Washington, DC, 1980, pp. 12–25.
[9] R. C. Adkins and M. H. Wardle, A method for the design of optimum annular diffusers of canted configuration, Journal of Engineering for Gas Turbines and Power, vol. 114(1), 1992, pp. 8–12. https://doi.org/10.1115/1.2906311
[10] A. D. Walker, P. A. Denman, and J. J. McGuirk, Experimental and computational study of hybrid diffusers for gas turbine combustors, Journal of Engineering for Gas Turbines and Power, vol. 126(4), 2004, pp. 717–725. https://doi.org/10.1115/1.1772403
[11] S. Obi, K. Aoki, and S. Masuda, Experimental and computational study of turbulent separating flow in an asymmetric plane diffuser, In Proc. 9th Symposium on Turbulent Shear Flows, 1993, pp. 305–312.
[12] ANSYS CFX 19.1 (2018) ANSYS CFX-Solver Theory Guide. ANSYS Inc.
[13] V. Chandavari and M. S. Palekar, Diffuser angle control to avoid flow separation, International Journal of Technical Research and Application, vol. 2(5), 2014, pp. 16-21.