Numerical study of hypersonic flows over reentry configurations with different chemical nonequilibrium models

Hao, Jiaao; Wang, Jingying; Lee, Chun‐Hian

doi:10.1016/j.actaastro.2016.04.014

Cited by 68 publications

(26 citation statements)

References 19 publications

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“…The numerical simulations in this study are performed using a multi-block parallel finite-volume CFD code called PHAROS (Hao, Wang & Lee 2016), which has been successfully applied to thermochemical non-equilibrium flows over capsule, doublecone, hollow-cylinder/flare and double-wedge configurations (Hao, Wang & Lee 2018;Hao & Wen 2018b;Hao, Wen & Wang 2019).…”

Section: Methodsmentioning

confidence: 99%

Hypersonic flow over spherically blunted double cones

Hao

Wen

2020

J. Fluid Mech.

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Section: Methodsmentioning

confidence: 99%

Hypersonic flow over spherically blunted double cones

Hao

Wen

2020

J. Fluid Mech.

Self Cite

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“…Governing Equations. In the three-dimensional Cartesian coordinate system, the Navier-Stokes equation is expressed as follows for nonequilibrium flow [11,12]:…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

“…The numerical method is validated by flight data of the ELECTRE vehicle [12,21] and test measurement data in the arc-heated wind tunnel [22]. The ELECTRE vehicle is a sphero-conical configuration with an overall length of 2 m, cone half-angle of 4.6 degrees, and nose radius of 0.175 m. One trajectory point is chosen with the free stream condition of altitude 53.3 km and Mach number 13 [21].…”

Section: Methods Validationmentioning

confidence: 99%

Study on the Simulation Method of the Ground Test in the Arc-Heated Wind Tunnel

Luo

Yang

Liang

et al. 2020

International Journal of Aerospace Engineering

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To analyze the effectiveness of the thermal assessment test, the simulation method of the ground test in the arc-heated wind tunnel is studied. Based on the solution of the thermochemical nonequilibrium Navier-Stokes equations, the flowfield around the spherical cylinder is simulated in the flight and ground test conditions, and the difference in the high enthalpy flowfield between the flight and ground test conditions is investigated. The flight parameters and ground test conditions are selected according to the criterion that the total enthalpy and the stagnation point heat flux of the fully catalytic cold wall (calibrated heat flux) are similar. The flowfield for different temperature boundaries and different catalytic walls is solved under the same free stream conditions, and the stagnation point heat flux and oxygen atom mass fraction are compared and analyzed. It is found that the heat flux on the fully catalytic wall for the radiation balance temperature boundary in the ground test is lower than that in the corresponding flight condition, but the difference is not obvious on the noncatalytic wall. In addition, the oxygen atom mass fraction after the shock wave in the ground test is higher than that in the corresponding flight condition. To make the stagnation point heat flux and oxygen atom mass fraction after the shock wave similar to those of the flight, the simulation method of the arc-heated wind tunnel test needs to be adjusted.

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“…From the two strong TIR radiation sources, accurately predicting the surface temperature and flow field parameters is important. In this section, two available reference data are used for validation studies of the surface temperature and the flow field parameters: (1) double-cone UHTC (Ultra-high temperature ceramics) surface temperature test in the L2K wind tunnel at DLR (German Aerospace Center) Köln in Germany [42], and (2) reference data of the ELECTRE [43] vehicle at 293 s reported by Hao et al [44]. The detailed computational parameters were given in our previous work [6,41] including the geometry size, material thermal properties, grids, boundary conditions, and so forth.…”

Section: Validations Of Surface Temperature and Flow Field Parametersmentioning

confidence: 99%

Infrared Optical Observability of an Earth Entry Orbital Test Vehicle Using Ground-Based Remote Sensors

et al. 2019

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Optical design parameters for a ground-based infrared sensor rely strongly on the target’s optical radiation properties. Infrared (IR) optical observability and imaging simulations of an Earth entry vehicle were evaluated using a comprehensive numerical model. Based on a ground-based IR detection system, this model considered many physical mechanisms including thermochemical nonequilibrium reacting flow, radiative properties, optical propagation, detection range, atmospheric transmittance, and imaging processes. An orbital test vehicle (OTV) was selected as the research object for analysis of its observability using a ground-based infrared system. IR radiance contours, maximum detecting range (MDR), and thermal infrared (TIR) pixel arrangement were modeled. The results show that the distribution of IR radiance is strongly dependent on the angle of observation and the spectral band. Several special phenomena, including a strong receiving region (SRR), a characteristic attitude, a blind zone, and an equivalent zone, are all found in the varying altitude MDR distributions of mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) irradiances. In addition, the possible increase in detectivity can greatly improve the MDR at high altitudes, especially for the backward and forward views. The difference in the peak radiance of the LWIR images is within one order of magnitude, but the difference in that of the MWIR images varies greatly. Analyses and results indicate that this model can provide guidance in the design of remote ground-based detection systems.

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Numerical study of hypersonic flows over reentry configurations with different chemical nonequilibrium models

Cited by 68 publications

References 19 publications

Hypersonic flow over spherically blunted double cones

Hypersonic flow over spherically blunted double cones

Study on the Simulation Method of the Ground Test in the Arc-Heated Wind Tunnel

Infrared Optical Observability of an Earth Entry Orbital Test Vehicle Using Ground-Based Remote Sensors

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