Coupled Analysis of Aerodynamic Heating, Radiative Heat Transfer and Heat Conduction for Hypersonic Vehicles

Chen, Xin; Liu, Li; Yue, Zhenjiang

doi:10.2514/6.2015-3670

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…Aerodynamic heating in the boundary layer is obtained using the CFD method. According to the experience of previous studies [4,6,19], the surface temperatures are selected as the peak temperatures of the thermal equilibrium state, which occur when the aerodynamic heat flux q aero is in equilibrium with the radiation heat flux q rad and the conductive heat flux q cond :…”

Section: Hypersonic Aerodynamic Heating and Thermal Modal Analysismentioning

confidence: 99%

Aerothermoelastic Analysis of a Hypersonic Vehicle Based on Thermal Modal Reconstruction

Chen

Zhao

2019

International Journal of Aerospace Engineering

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Hypersonic vehicles operate in a severe aerodynamic heating environment, which has a significant impact on their structural dynamic characteristics. Therefore, aerodynamic heating effects cannot be ignored when performing an aeroelastic analysis for a hypersonic vehicle. However, incorporating aerodynamic heating effects into the fluid-structural coupling analysis will result in extreme computational costs. Actually, after experiencing a sustained flight in a fixed state, the vehicle will eventually reach the thermodynamic equilibrium. Thus, the aeroelastic analysis can be efficiently performed by using the structural dynamic characteristics of the heated vehicle operating in each equilibrium state. The effects of aerodynamic heating show that the modal frequencies and modal shapes of the flexible structure are bound to change significantly in comparison with the unheated structure. In this paper, a method of thermal modal reconstruction is developed in order to directly generate the structural mode shapes and frequencies within the given parameter space without having to solve a high-fidelity thermal and structural problem. Once the modal data are available, the multivariate interpolation in a tangent space to Grassmann manifold is used to generate the modal matrix at the arbitrary selected parameter point. Besides, the Kriging interpolation method is used to establish the approximate relationships between natural frequencies and sampling points. Finally, an example of an aerodynamic heated control surface structure is used to validate the effectiveness of the proposed aerothermoelastic framework. It is demonstrated that the developed thermal modal reconstruction method has good robustness, very high computational efficiency, and sufficient accuracy over a wide parametric domain.

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Section: Hypersonic Aerodynamic Heating and Thermal Modal Analysismentioning

confidence: 99%

Aerothermoelastic Analysis of a Hypersonic Vehicle Based on Thermal Modal Reconstruction

Chen

Zhao

2019

International Journal of Aerospace Engineering

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“…Regarding the coupling of subsystems, Chen et al [179] studied the coupling of aerodynamic heating, radiation heat transfer, and heat conduction in hypersonic vehicles with the flow chart and solving procedure of coupling analysis shown in Figure 49. The results show that the temperature obtained by coupling solution is relatively accurate, with a relative error lower than 10% most of the time.…”

Section: Thermal Protection Systemsmentioning

confidence: 99%

Thermal Protection System and Thermal Management for Combined-Cycle Engine: Review and Prospects

et al. 2019

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Combined-cycle engine is a potential propulsion system for hypersonic aircraft. To ensure long-term, normal operation of combined-cycle engine under the harsh environment of high thermal load, it is of great significance to study the thermal protection and management of the propulsion system. In this study, the objective and development status of thermal protection and thermal management systems for the combined-cycle propulsion system were described. The latest research progresses of thermal protection, thermal barrier coating, and thermal management system of the combined-cycle propulsion system were summarized. Moreover, the problems and shortcoming in current researches were summarized. In addition, a prospect for the future development of thermal protection and management of the combined-cycle propulsion system was presented, pointing out a direction of great value and vital research significance to thermal protection and management of the combined-cycle propulsion system.

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A review and reappraisal of the specific gravities of present and past multicellular organisms, with an emphasis on tetrapods

Larramendi¹,

Paul

Hsu³

2020

The Anatomical Record

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The density, or specific gravity (SG), of organisms has numerous important implications for their form, function, ecology, and other facets of beings living and dead, and it is especially necessary to apply SG values that are as accurate as practical when estimating their masses which is itself a critical aspect of living things. Yet a comprehensive review and analysis of this notable subject of anatomy has never been conducted and published. This is such an effort, being as extensive as possible with the data on hand, bolstered by some additional observations, and new work focusing on extinct animals who densities are least unknown: pterosaurs and dinosaurs with extensive pneumatic complexes, including the most sophisticated effort to date for a sauropod. Often difficult to determine even via direct observation, techniques for obtaining the best possible SG data are explained and utilized, including observations of floating animals. Neutral specific gravity (NSG) is proposed as the most important value for tetrapods with respiratory tracts of fluctuating volume. SGs of organisms range from 0.08 to 2.6, plant tissues from 0.08 to 1.39, and vertebrates from about 0.75 (some giant pterosaurs) to 1.2 (those with heavy armor and/or skeletons). Tetrapod NSGs tend to be somewhat higher than widely thought, especially those theropod and sauropod dinosaurs and pterosaurs with air‐sacs because respiratory system volume is usually measured at maximum inhalation in birds. Also discussed is evidence that the ratio of the mass of skeletons relative to total body mass has not been properly assayed in the past.

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Coupled Analysis of Aerodynamic Heating, Radiative Heat Transfer and Heat Conduction for Hypersonic Vehicles

Cited by 8 publications

References 19 publications

Aerothermoelastic Analysis of a Hypersonic Vehicle Based on Thermal Modal Reconstruction

Aerothermoelastic Analysis of a Hypersonic Vehicle Based on Thermal Modal Reconstruction

Thermal Protection System and Thermal Management for Combined-Cycle Engine: Review and Prospects

A review and reappraisal of the specific gravities of present and past multicellular organisms, with an emphasis on tetrapods

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