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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2016, Vol. 17 Issue (1): 45-53    DOI: 10.1631/jzus.A1500244
    
Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration
Wei Huang1,†(),Ming-hui Li2,Feng Ding1,Jun Liu1
1Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China
2China Aerodynamics R&D Center, Mianyang 621000, China
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Abstract  

An efficient mixing process is very important for the engineering implementation of an airbreathing propulsion system. The air and injectant should be mixed sufficiently before entering the combustor. Two new wall-mounted cavity configurations were proposed to enhance the mixing process in a conventional transverse injection flow field. Their flow field properties were compared with those of a system with only transverse injection ports. Grid independency analysis was used to choose a suitable grid scale, and the mixing efficiencies at four cross-sectional planes (namely x=20, 40, 60, and 80 mm, which are just downstream of the jet orifice) were compared for the configurations considered in this study. The results showed that hydrogen penetrated deeper when a cavity was mounted upstream of the transverse injection ports. This is beneficial to the mixing process in supersonic flows. The mixing efficiency of the configuration with the wall-mounted cavity was better than that of the conventional physical model, and the mixing efficiency of the proposed novel physical model I (98.71% at x=20 mm) was the highest of all. In the case with only transverse injection ports, the vortex was broken up by the strong interaction between the shear layer over the cavity and the jet.

Key words： Scramjet engine      Mixing enhancement      Vortex generator      Transverse injection      Cavity      Supersonic flow     
Received: 05 September 2015      Published: 06 January 2016
Fund:  the National Natural Science Foundation of China(No. 11502291);the Fund for Owner of Outstanding Doctoral Dissertation from the Ministry of Education of China(No. 201460)
Corresponding Authors: Wei Huang     E-mail: gladrain2001@163.com
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Wei Huang
Ming-hui Li
Feng Ding
Jun Liu
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Wei Huang,Ming-hui Li,Feng Ding,Jun Liu. Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2016, 17(1): 45-53.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1500244     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2016/V17/I1/45

Fig. 1 Plan and symmetric views of the three physical models employed in this study: (a) conventional physical model; (b) novel physical model I; (c) novel physical model II (unit: mm)
Fig. 2 Convergence history for novel physical model II
Fig. 3 Grid system for novel physical model I
Fig. 4 Close-up view of the grid system around the cavity in novel physical model I
Fig. 5 Close-up view of the grid system at the bottom wall of the cavity in novel physical model I
Fig. 6 Comparison of wall static pressure (Pw) resulting from different grid scales used in the conventional physical model
Fig. 7 Comparison of Mach number contours on the symmetric and four cross-sectional planes resulting from different grid scales used in the conventional physical model (a) Coarse grid; (b) Moderate grid; (c) Refined grid
Fig. 8 Comparison of Mach number contours on the symmetric and four cross-sectional planes for three physical models with a moderate grid scale (a) Conventional physical model; (b) Novel physical model I; (c) Novel physical model II
Fig. 9 Comparison of vortex structure at the cross-sectional plane x=20 mm (a) Conventional physical model; (b) Novel physical model I; (c) Novel physical model II
Fig. 10 Comparison of hydrogen mole fraction contours on the symmetric and four cross-sectional planes for three physical models with a moderate grid scale (a) Conventional physical model; (b) Novel physical model I; (c) Novel physical model II
Fig. 11 Comparison of hydrogen mole fraction contours on the lower wall for three physical models with a moderate grid scale (a) Conventional physical model; (b) Novel physical model I; (c) Novel physical model II
Fig. 12 Comparison of the mixing efficiency of the physical models employed in this study
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