Hypersonic aerodynamic interference investigation for a two-stage-to-orbit model

Jia, Juhong; Fu, Debin; He, Zepeng; Yang, Junfan; Hu, Lianxi

doi:10.1016/j.actaastro.2019.11.038

Cited by 21 publications

(7 citation statements)

References 21 publications

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“…The two-equation k-ε turbulent model is thus used in this study, which has been used in Refs. [20][21][22][23]. The code is based on a numerical framework finite volume method and a multi-dimensional total variation denoising (TVD) scheme to accurately simulate the supersonic flow.…”

Section: A Governing Equationsmentioning

confidence: 99%

Investigation on Infrared Radiation Signatures of Under-Expanded Rocket Exhaust Plumes Due to Angle of Attack

et al. 2021

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A real flight trajectory varying from 5-60 km altitude was adopted for analyzing the effects of the angle of attack (AOA) on the IR signatures of rocket exhaust plumes. Three representative underexpanded states based on nozzle pressure ratio (NPR), including moderately under-expanded (NPR = 1.27), highly under-expanded (NPR = 12.5), and over-highly under-expanded (NPR = 120) states, were discussed. The results show that the appearance of the AOA shortens the plume scale size and afterburning region, but the peak temperature cannot significantly change. As an increase in the AOA, the high-temperature region and Mach cells are compressed to a small domain. The spectral radiant intensity is reduced and the decreasing rate is gradual for a large AOA. The peak radiance in the 2.7 μm band decreases, but that in the 4.3 μm band increases. The peak radiance curve shifted toward the increasing NPR as the AOA increases, and then the curve decreases monotonically from an initial "arched" shape. In addition, a group of band pairs can be observed by two intersecting in-band profiles as a function of altitude. The characteristic altitude of band pairs became more concentrated and moved toward low altitude with the increase in AOA.

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Section: A Governing Equationsmentioning

confidence: 99%

Investigation on Infrared Radiation Signatures of Under-Expanded Rocket Exhaust Plumes Due to Angle of Attack

et al. 2021

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“…The air bulk density is set used to simulate heat transfer and fl uid fl ow in a cloth-air-skin system. Three-dimensional continuity, momentum, and energy equations with the realizable k-ɛ model [13,14] in tensor forms were considered for modeling heat transfer and fl uid fl ow in the air gap. The divergence of the radiative heat fl ux can be obtained using: (1) where I b is the blackbody intensity, is defi ned as:…”

Section: Solution Proceduresmentioning

confidence: 99%

Numerical Investigation of Heat Transfer in Garment Air Gap

Zhang

Jia

2020

Autex Research Journal

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This article aimed to study the characteristics and mechanisms of 3D heat transfer through clothing involving the air gap. A three-dimensional finite volume method is used to obtain the coupled conductive, convective, and radiative heat transfer in a body-air-cloth microclimate system. The flow contours and characteristics of temperature, heat flux, and velocity have been obtained. The reason for the high flux and temperature regions was analyzed. Computational results show that the coupled effect of the air gap and the airflow between the skin and garment strongly influences the temperature and heat flux distribution. There are several high-temperature regions on the clothing and high heat flux regions on the body skin because the conductive heat flux can cross through the narrow air gap and reach the cloth surface easily. The high-speed cooling airflow brings about high forced convective heat flux, which will result in the temperature increase on the upper cloth surface. The radiative heat flux has a strong correlation with the temperature gradient between the body and clothing. But its proportion in the total heat flux is relatively small.

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“…The commercial mesh generation software ICEM-CFD 17.0 was used to produce the three-dimensional tetrahedral mesh. The mesh independence test was carried out with three different mesh scales [17]. The numbers of nodes are 1.0 M for coarse mesh, 1.5 M for moderate, and 2.0 M for the refi ned mesh.…”

Section: Mesh Generation and Boundary Conditionsmentioning

confidence: 99%

Numerical Simulation of Solar Radiation and Conjugate Heat Transfer through Cabin Seat Textile

Zhang

Jia

2020

Autex Research Journal

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The solar radiation and the conjugate heat transfer through the cabin seat fabric were investigated numerically with a focus on a comparative analysis of various fabric solar reflectance or reflectivity (SR) and inlet cooling air velocity. For this purpose, 3D compressible Reynolds-averaged Navier–Stokes equations with the low Reynolds number turbulence model were utilized to simulate the airflow in the cabin. The discrete ordinate radiation model was adopted to describe the solar radiation. The conjugate heat transfer between the airflow and the fabric seats was included. The airflow temperature, radiative heat flux, and radiative heat transfer through the fabrics in a fixed cross section were studied. The results demonstrate that the increase in fabric SR leads to the increase in energy reflected to the atmosphere, which will bring about a lower temperature on the seat fabric. The decrease in emissivity and the energy absorbed results in the lower heat transfer and heat radiation and leads to the improvement of the cabin thermal environment. The high-temperature gradient near the seat causes the forced air circulation and is beneficial for the improvement of the thermal comfort. However, the cooling effect is not so obvious near the cabin seats when the inflow speed is increased.

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Hypersonic aerodynamic interference investigation for a two-stage-to-orbit model

Cited by 21 publications

References 21 publications

Investigation on Infrared Radiation Signatures of Under-Expanded Rocket Exhaust Plumes Due to Angle of Attack

Investigation on Infrared Radiation Signatures of Under-Expanded Rocket Exhaust Plumes Due to Angle of Attack

Numerical Investigation of Heat Transfer in Garment Air Gap

Numerical Simulation of Solar Radiation and Conjugate Heat Transfer through Cabin Seat Textile

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