Performance analysis of a strut-aided hypersonic scramjet by full-scale IDDES modeling

Yao, Wei; Liu, Hang; Xue, Lianjie; Xiao, Yabing

doi:10.1016/j.ast.2021.106941

Cited by 17 publications

(1 citation statement)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This hybrid method uses a transition function 34 of the distance to the wall, which combines the Spalart–Allmaras (S-A) RANS model 35 near the wall and the Yoshizawa sub-grid model 36 far from the wall. Although the RANS model may neglect the turbulence and combustion interaction, the computational load caused by grid refinement near the wall would be greatly reduced, and similar treatments 37,38 have been used widely for the same purpose. Meanwhile, the RANS model simulates only a very thin layer near wall (∼0.1 δ inf ), its impacts do not count for much.…”

Section: Experimental Description and Numerical Treatmentmentioning

confidence: 99%

Effects of cavity parameters on flame flashback phenomenon in a supersonic crossflow with a cavity flameholder

Tang

Zhao

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

In this paper, the cavity parameters of length-to-depth ratio, aft ramp angle, and nitrogen throttling positions are numerically studied by a Large Eddy Simulation (LES) combined with the Flamelet/Progress Variable (FPV) model, to investigate the inducing factors and formation mechanism of flame flashback. These numerical studies are validated and compared to our previous experiments. It can be observed from both the calculated and experimental flow field that the larger length-to-depth ratio, sharper aft ramp angle, and nitrogen throttling closer to the cavity strengthen the mixing of fuel wake and promote the jet penetration depth. Meanwhile, the separation of the boundary layer downstream of the cavity can be induced by the shear layer, acoustic oscillation, as well as nitrogen throttling. And the above favorable prerequisites enhance the heat release nearby, while the reverse pressure gradient causes the enlargement of the boundary layer separation in turn. Under this positive feedback, thermal choking is formed and drives the reverse propagation of the high-temperature flame. It is concluded that the downstream boundary layer separation induced by the changes of the cavity parameters is a prerequisite for the flame flashback, and the formation of the thermal choking is the main reason for the flame flashback.

show abstract