Preliminary Study on Mixing Mechanism of Three-Dimensional Vortices in the Wake of Lobe-Type Rear Variable Area Bypass Injector
Publication: Journal of Aerospace Engineering
Volume 35, Issue 6
Abstract
In this work, an innovative lobe-type rear variable area bypass injector is proposed, which can take into account both mixing exhaust performance to increase thrust at a high Bypass Ratio (BR), and bypass throttling at low BR. In order to explore the aerodynamic characteristics of the variable injector, the unsteady motion characteristics and the congenerous thermal transport effect of three-dimensional wake vortices within the BR range of 0.18 to 0.68 are numerically analyzed. The results demonstrate that the injector can adjust the sidewall of the collapsible lobe based on the injection of bypass flow, and significantly strengthen streamwise vortices induced by lobe peak (SV-LP), which can effectively drive the migration of the heterogeneous fluid element, so as to compensate for the inefficient mixing ability of Kelvin-Helmholtz (K-H) vortices. When the BR is raised to 0.36, the increasing SV-LP will gradually replace the low-disturbance K-H vortices in the dominant position of the quasi-ordered flow field by virtue of a strong entrainment effect. Therefore, the injector can maintain a relatively high thrust augmentation in a wide working envelope.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by National Major Science and Technology Projects of China (J2019-II-0007-0027), Fundamental Research Funds for the Central Universities (3082018NP2018102), National Natural Science Foundation of China (12002162), and Jiangsu Province Natural Science Foundation (BK20200449).
References
Akram, S., and E. Rathakrishnan. 2019. “Corrugated tabs for enhanced mixing of supersonic elliptic jet.” J. Aerosp. Eng. 32 (1): 04018140. https://doi.org/10.1061/(ASCE)AS.1943-5525.0000970.
Allan, R. 1979. “General Electric Company variable cycle engine technology demonstrator programs.” In Proc., 15th Joint Propulsion Conf. Reston, VA: American Institute of Aeronautics and Astronautics.
Bartolotta, P. A., N. B. McNelis, and D. G. Shafer. 2003. “High speed turbines: Development of a turbine accelerator (RTA) for space access.” In Proc., 12th AIAA Int. Space Planes and Hypersonic Systems and Technologies. Reston, VA: American Institute of Aeronautics and Astronautics.
Eckerle, W. A., H. Sheibani, and J. Awad. 1992. “Experimental measurement of the vortex development downstream of a lobed forced mixer.” J. Eng. Gas Turbine Power 114 (1): 63–71. https://doi.org/10.1115/1.2906308.
Feng, J., J. Lu, and C. Shen. 2020. “Transverse forcing on supersonic, spatially evolving mixing layers.” J. Aerosp. Eng. 33 (4): 04020036. https://doi.org/10.1061/(ASCE)AS.1943-5525.0001151.
Frost, T. H. 1966. “Practical bypass mixing systems for fan jet aero engines.” Aeronaut. Q. 17 (2): 141–160. https://doi.org/10.1017/S0001925900003760.
Gerlinger, P., P. Stoll, M. Kindler, F. Schneider, and M. Aigner. 2008. “Numerical investigation of mixing and combustion enhancement in supersonic combustors by strut induced streamwise vorticity.” Aerosp. Sci. Technol. 12 (2): 159–168. https://doi.org/10.1016/j.ast.2007.04.003.
Hu, H., T. Saga, T. Kobayashi, and N. Taniguchi. 2002. “Mixing process in a lobed jet flow.” AIAA J. 40 (7): 1339–1345. https://doi.org/10.2514/2.1793.
Johnson, J. E. 1996. “Variable cycle engine developments at General Electric—1955–1995.” In Developments in high-speed vehicle propulsion systems, 105–158. Norfolk, VA: American Institute of Aeronautics and Astronautics.
Lei, Z., A. Mahallati, M. Cunningham, and P. Germain. 2012. “Effects of core flow swirl on the flow characteristics of a scalloped forced mixer.” J. Eng. Gas Turbine Power 134 (11): 4005968. https://doi.org/10.1115/1.4005968.
Lovett, J., T. Brogan, D. Philippona, B. Kiel, and T. Thompson. 2004. “Development needs for advanced afterburner designs.” In Proc., 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conf. and Exhibit. Reston, VA: American Institute of Aeronautics and Astronautics.
Martens, S., K. Kinzie, and D. McLaughlin. 1994. “Wave structure of coherent instabilities in a planar supersonic shear layer.” In Proc., 32nd Aerospace Sciences Meeting and Exhibit. Reston, VA: American Institute of Aeronautics and Astronautics.
McCormick, D. C., and J. C. Bennett. 1994. “Vortical and turbulent structure of a lobed mixer free shear layer.” AIAA J. Am. Inst. Aeronaut. Astronaut. 32 (9): 1852–1859. https://doi.org/10.2514/3.12183.
Miao, J., Y. Fan, W. Wu, and S. Zhao. 2020. “Influence of air-entraining intensity on the afterburner ignition, flame-holding and combustion characteristics.” Aerosp. Sci. Technol. 106 (20): 106063. https://doi.org/10.1016/j.ast.2020.106063.
Morris, P. J., and K. B. M. Q. Zaman. 2010. “Velocity measurements in jets with application to noise source modeling.” J. Sound Vib. 329 (4): 394–414. https://doi.org/10.1016/j.jsv.2009.09.024.
Papamoschou, D., and A. Roshko. 1988. “The compressible turbulent shear layer: An experimental study.” J. Fluid Mech. 197 (3): 453–477. https://doi.org/10.1017/S0022112088003325.
Paterson, R. W. 1984. “Turbofan mixer nozzle flow field—A benchmark experimental study.” J. Eng. Gas Turbine Power 106 (3): 692–698. https://doi.org/10.1115/1.3239625.
Saounatsos, Y. E. 1998. “Technology readiness and development risks of the new supersonic transport.” J. Aerosp. Eng. 11 (3): 95–104. https://doi.org/10.1061/(asce)0893-1321(1998)11:3(95).
Suzuki, H., N. Kasagi, and Y. Suzuki. 2004. “Active control of an axisymmetric jet with distributed electromagnetic flap actuators.” Exp. Fluids 36 (3): 498–509. https://doi.org/10.1007/s00348-003-0756-0.
Tam, C. K. W. 1978. “Excitation of instability waves in a two-dimensional shear layer by sound.” J. Fluid Mech. 89 (2): 357–371. https://doi.org/10.1017/S0022112078002645.
Tan, J., D. Zhang, and L. Lv. 2018. “A review on enhanced mixing methods in supersonic mixing layer flows.” Acta Astronaut. 152 (Nov): 310–324. https://doi.org/10.1016/j.actaastro.2018.08.036.
Vdoviak, J. W., P. R. Knott, and J. J. Ebacker. 1981. Aerodynamic/acoustic performance of YJ101/double bypass VCE with coannular plug nozzle. Rep. No. R80AEG369. Cincinnati, OH: General Electric Co.
Vyvey, P., W. Bosschaerts, V. Fernandez Villace, and G. Paniagua. 2011. “Study of an airbreathing variable cycle engine.” In Proc., 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conf. and Exhibit. Reston, VA: American Institute of Aeronautics and Astronautics.
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Published In
Journal of Aerospace Engineering
Volume 35 • Issue 6 • November 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Dec 14, 2021
Accepted: Jun 24, 2022
Published online: Aug 30, 2022
Published in print: Nov 1, 2022
Discussion open until: Jan 30, 2023
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