Ionization and dissociation effects on boundary-layer stability

Miró, Fernando Miró; Beyak, Ethan S.; Pinna, Fabio; Reed, Helen L.

doi:10.1017/jfm.2020.786

Cited by 11 publications

(9 citation statements)

References 85 publications

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“…When working with the CNE assumption, the non-equilibrium is assumed to be restricted to the boundary layer, letting the inviscid region be frozen. This assumption is based on the observations made for a Mach 45 wedge in CNE [21]. Despite the high post-shock temperatures, the flow high speed renders the chemical activity considerably slower than the flow, and therefore justifies the frozen flow assumption.…”

Section: Inviscid Regionmentioning

confidence: 99%

“…The inviscid flow region is characterized by the considered geometry: in the present work only flows over wedges are studied. The wedge shock jumps are obtained from the oblique jump-shock relations, consistently with the employed flow assumption, as detailed in Miró Miró et al [21].…”

Section: Inviscid Regionmentioning

confidence: 99%

“…Miró Miró et al [19] proposed an alternative compatibility boundary condition for the species partial density perturbations, which significantly improved the conditioning of the matrix system. It was then used to study diffusion and strong chemistry effects on adiabatic-wall boundary layers [20], and ionization effects in a Martian return mission [21]. Recently, Miró Miró et al [14] revisited some of these literature results, analyzing the influence of thermodynamic, transport and chemistry models, in terms of stability and transition predictions.…”

Section: Introductionmentioning

confidence: 99%

“…A parametric study on a wedge geometry for different re-entry conditions and flow assumptions is considered to isolate the non-parallel effects. The laminar basic-state flowfields are obtained with the DEKAF solver [21,34], and the stability computations with the VESTA toolkit [35], benefiting from its Automatic Derivation and Implementation Tool [36].…”

Section: Introductionmentioning

confidence: 99%

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Weak Non-Parallel Effects on Chemically Reacting Hypersonic Boundary Layer Stability

Zanus

Miró

Pinna

2019

AIAA Aviation 2019 Forum

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Advancing towards the correct modeling and subsequent understanding of laminar-toturbulent transition during atmospheric reentry is paramount for the future of aerospace technology. The coexistence of multiple physical phenomena and the grand amount of conditioning factors require the progressive extension of the applicability capabilities of the theoretical models. Past efforts have been mostly dedicated to investigate high-temperature and non-equilibrium effects using parallel stability theories. However, the implications of coupling these thermochemical phenomena with non-parallelism remains uncertain. Advanced state of the art thermodynamic and transport models are employed both in parallel and weakly non-parallel stability theories (LST and LPSE). A parametric study about the influence of nonlocal effects under different re-entry conditions and flow assumptions (i.e. CPG, TPG, CNE and LTE) showed that non-parallel effects stabilize/destabilize the boundary-layer, depending on the altitude and independently from the gas model employed. Particularly, they lead to a stronger destabilization of the 2 nd Mack mode at the earliest points of the atmospheric re-entry flight envelope, reducing their effect until being weakly stabilizing at the lowest altitudes. Drastic N factor increments occurred assuming LTE, due to the presence of unstable supersonic modes, promoted by the boundary-layer cooling, caused by the intense chemical activity. Nomenclature Acronyms BEW Blottner-Eucken-Wilke transport model CE Chapman & Enskog's transport model

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Section: Inviscid Regionmentioning

confidence: 99%

Section: Inviscid Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Weak Non-Parallel Effects on Chemically Reacting Hypersonic Boundary Layer Stability

Zanus

Miró

Pinna

2019

AIAA Aviation 2019 Forum

Self Cite

View full text Add to dashboard Cite

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“…We have observed that derivatives of the MUTATION ++ properties numerically reconstructed exhibit a noisy behaviour, which is found to greatly impact the stability results. The equilibrium composition is obtained from the DEKAF boundary layer solver (Groot et al 2018), which solves the equilibrium system based on partial pressure (Miró Miró et al 2018) while enforcing the ambipolar condition. Transport properties are obtained similarly to Scoggins & Magin (2014): using approximations to Chapman and Enskog's expansion using Laguerre-Sonine polynomials following .…”

Section: Base Statementioning

confidence: 99%