Numerical Study of the Receptivity of a Blunt Cone to Freestream Pulse Disturbances in Hypersonic Flow

He, Simon; Zhong, Xiaolin

doi:10.2514/6.2021-2887

Cited by 3 publications

References 39 publications

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The effects of nose bluntness on broadband disturbance receptivity in hypersonic flow

Zhong

2022

Physics of Fluids

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While nose bluntness is known to have a large impact on the stability of hypersonic vehicles, its influence on the freestream receptivity process has not been fully characterized for a wide range of conditions. This paper investigates the effects of nose bluntness on the second mode receptivity coefficients and the development of boundary layer disturbances over two 7 degree half-angle circular blunt cones at mach 10 after perturbation with broadband freestream pulses of different types. The cones have nose radii of 9.525 mm (Case B) and 5.08 mm (Case I). Unsteady direct numerical simulation (DNS) and linear stability theory (LST) results compare well and predict stronger second mode growth for Case I in all pulse cases. Unsteady DNS also shows variations in extramodal excitation between the cones depending on freestream disturbance type. Spectral receptivity coefficients are generated by decomposing the unsteady DNS data into discrete frequency Fourier modes which are then corrected with LST N-factors. Fast acoustic disturbances demonstrate minimal variation in receptivity coefficients, while temperature and vorticity disturbances have much higher coefficients in Case I. Planar slow acoustic pulses induce stronger disturbances outside of the second mode in Case, resulting in higher peak receptivity coefficients. Results show significant variation in receptivity response based on nose bluntness, pulse geometry, and the type of the incident perturbation.

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The effects of nose bluntness on broadband disturbance receptivity in hypersonic flow

Zhong

2022

Physics of Fluids

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Application of Broadband Receptivity Data to the Amplitude Method for Transition Prediction

Zhong

2023

Journal of Spacecraft and Rockets

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Conventional hypersonic transition prediction relies upon the highly empirical [Formula: see text] method, which is predicated on theoretical approximations of relative disturbance growth. This does not account for the receptivity mechanism and the high degree of variability present in experimental wind-tunnel conditions, which itself leads to high degrees of variability in transition [Formula: see text] factors. The amplitude method, which better approximates the broadband nature of boundary-layer disturbances, was previously proposed to account for the effects of receptivity. In this study, high-fidelity simulated second-mode receptivity data for two blunt cones at Mach 10 to broadband disturbances are applied to an iterative approximation of the amplitude method tuned for second-mode dominated flows. The studied geometries consist of 9.525- and 5.080-mm-nose-radius 7 deg half-angle straight cones based on experimental cases from Arnold Engineering Development Center’s wind tunnel 9. Amplitude method predictions show improvement over the accuracy of [Formula: see text] estimates using standard threshold [Formula: see text] factors. In particular, the less blunt 5.080 mm cone demonstrates the best agreement due to its stronger second-mode response. The results of this work provide a preliminary framework for applying high-fidelity receptivity simulations to the amplitude method for transition prediction in hypersonic flows.

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A High-Order Finite-Difference Method for Linear Stability Analysis and Bi-orthogonal Decomposition of Hypersonic Boundary Layer Flow

Zou

Zhong

2023

AIAA SCITECH 2023 Forum

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Numerical Study of the Receptivity of a Blunt Cone to Freestream Pulse Disturbances in Hypersonic Flow

Cited by 3 publications

References 39 publications

The effects of nose bluntness on broadband disturbance receptivity in hypersonic flow

The effects of nose bluntness on broadband disturbance receptivity in hypersonic flow

Application of Broadband Receptivity Data to the Amplitude Method for Transition Prediction

A High-Order Finite-Difference Method for Linear Stability Analysis and Bi-orthogonal Decomposition of Hypersonic Boundary Layer Flow

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