Magnetic field control of high-enthalpy shock wave/boundary-layer interactions using a fully implicit thermochemical non-equilibrium solver

Jiang, Hao; Liu, Jun; Che, Xueke; Du, Youwei; Huang, Wei; Ding, Feng; Zhang, Tiantian

doi:10.1016/j.ast.2023.108507

Cited by 2 publications

(1 citation statement)

References 35 publications

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“…Based on the understanding of the nonlinear instability mechanisms, transition control has attracted considerable interest in the research community. Many methods can be used for controlling transition, such as wall blowing, 24,25 secondary recirculation jet, [26][27][28][29][30][31][32][33] and wall cooling and heating. 34 In addition, streaks have been applied successfully to control transition in both supersonic 35 and hypersonic flows.…”

Section: Introductionmentioning

confidence: 99%

Direct numerical simulation of mechanism and control of secondary instability induced transition in a supersonic boundary layer

Liu,

Huang,

Liu

2024

Physics of Fluids

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Mechanisms and control of secondary-instability-induced-transition in a supersonic boundary layer are studied numerically via direct numerical simulation. The aim is to investigate and compare the transition mechanisms of fundamental, subharmonic, asymmetric subharmonic, and detuned resonances, and to control these secondary instabilities using a local wall cooling strip. The results indicate that the nonlinear interaction between the high-amplitude primary mode and low-amplitude secondary modes is the main contributor to transition. The mutual- and self-interactions of the primary and secondary modes generate other harmonic modes with laminar breakdown soon appearing. The asymmetric subharmonic resonance induces the earliest transition, while the fundamental subharmonic has the latest. Wall cooling effects are also studied. The results show that a lower wall temperature significantly suppresses the secondary instabilities, and steady modes become dominant and lead to obvious streamwise vortexes. Numerical data demonstrate that all secondary-instability-induced transitions result in fully developed turbulent boundary layers, as supported by the skin friction and scaled velocity profiles. The transition control cases indicate that the local wall cooling strip can significantly delay the transition by suppressing the growth of the primary mode. An upstream control strip is found to have a more obvious suppression effect. The fundamental and asymmetric subharmonic resonances are sensitive to the location of the local wall cooling strip and show a stronger transition delaying effect.

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Section: Introductionmentioning

confidence: 99%

Direct numerical simulation of mechanism and control of secondary instability induced transition in a supersonic boundary layer

Liu,

Huang,

Liu

2024

Physics of Fluids

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Investigation of high enthalpy thermochemical nonequilibrium flow over spheres

Guo,

Wang,

2024

Physics of Fluids

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The hypersonic high enthalpy nitrogen flows over spheres are investigated by high-fidelity state-to-state (StS) modeling. The objective of the study is to understand the nonequilibrium behaviors in the shock layer, including the stagnation line features, surface heat transfer rate, and near-wall properties inside the thermal boundary layer. Two cases with the freestream total enthalpies of 16.5 and 15.5 MJ/kg are considered, and the numerical results are compared with the experimental data. The StS model yields an accurate prediction of the shock stand-off distance with the experiment rather than an underestimation by the traditional two-temperature model. Both the StS and two-temperature models provide general agreement of the stagnation point heat flux with the experiment. In comparison, the heat flux obtained by the StS model is lower than the two-temperature model. Note that our work finds distinctive behaviors of near-wall properties. The vibrational energy is not accommodated with the sphere surface and is in thermal nonequilibrium with the translational energy, with evidence showing that the vibrational temperature is much higher than the wall temperature and the translational temperature. The values of vibrational temperature in the immediate vicinity of the stagnation point are 9.3 and 10.0 times the wall temperature for the cases with total enthalpies of 16.5 and 15.5 MJ/kg, respectively. Moreover, the vibration temperature demonstrates a nonmonotonic variation trend with a local minimum, which can be explained by the nonequilibrium distributions of vibrational energy states due to vibrational-translational energy transfer and molecular recombination.

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Magnetic field control of high-enthalpy shock wave/boundary-layer interactions using a fully implicit thermochemical non-equilibrium solver

Cited by 2 publications

References 35 publications

Direct numerical simulation of mechanism and control of secondary instability induced transition in a supersonic boundary layer

Direct numerical simulation of mechanism and control of secondary instability induced transition in a supersonic boundary layer

Investigation of high enthalpy thermochemical nonequilibrium flow over spheres

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