A rapid approach to convective aeroheating prediction of hypersonic vehicles

Zhao, Jian; Gu, Liangxian; Ma, HongZhong

doi:10.1007/s11431-013-5258-6

Cited by 18 publications

(11 citation statements)

References 21 publications

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“…Above that temperature, the frequency begins to increase, and finally becomes higher than the initial value, about 454.9 Hz. For mode (2,1), the minimum value of frequency appears at a higher plate temperature than mode (1, 1). And then, it increases as well.…”

Section: Natural Vibrationmentioning

confidence: 91%

“…For modes (1,2) and (3,1), the order of the modes interchanges for the first time in their descending stages. This phenomenon was also observed in the previous work [27].…”

Section: Natural Vibrationmentioning

confidence: 99%

“…The fundamental frequency drops by almost 50% at about 70°C (T I in Figure 2(a)) from its initial value, and rises to more than 1.4 times of the original value at about 163°C. The maximum reduction ratio for the frequency of mode (2,1) is about 40% at about 75°C (T II in Figure 2(a)). For higher modes, the reduction ratios are no more than 25% in the test temperature range.…”

Section: Natural Vibrationmentioning

confidence: 99%

“…Temperature variations may change the material properties, the stress state and the configuration of structures, and will influence the static and dynamic performance during working [1,2]. In the meanwhile, structures also work under sorts of loads and excitations along with thermal variations [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigations on dynamic and acoustic responses of a thermal post-buckled plate

Geng

Wang

et al. 2015

Sci. China Technol. Sci.

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Experiments were carried out for a clamped rectangular aluminum plate to study the dynamic and acoustic behaviors in both pre-and post-buckling ranges under thermal loads. Plate temperature was elevated from ambient value to the level above the theoretical critical buckling temperature of the plate. In the whole test temperature range, the measured frequencies decreased to the minimum values in sequence, and then turned to increase as temperature rose. The softening effect of thermal stresses played the leading role in the decreasing stage and the stiffening effect of thermal buckling deflection became the major influence factor in the increasing stage. The later one could drive the temperature equilibrium point of the heated plate to move towards lower temperature range. All the frequencies would not drop to zero due to the inherent initial deflection which provides additional stiffness to the plate. Dynamic responses state two variation trends in different temperature ranges, shifting toward the lower frequency range and closing up in the mid-frequency range. The characters of spectrum responses changed gradually as the temperature was elevated. Numerical simulations gave predictions with same variation trend as the test results. thermal post-buckled plate, modal test, dynamic response test, numerical simulation Citation: Geng Q, Wang D, Liu Y, et al. Experimental and numerical investigations on dynamic and acoustic responses of a thermal post-buckled plate. Sci

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Section: Natural Vibrationmentioning

confidence: 91%

“…For modes (1,2) and (3,1), the order of the modes interchanges for the first time in their descending stages. This phenomenon was also observed in the previous work [27].…”

Section: Natural Vibrationmentioning

confidence: 99%

Section: Natural Vibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigations on dynamic and acoustic responses of a thermal post-buckled plate

Geng

Wang

et al. 2015

Sci. China Technol. Sci.

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“…heat is transferred from the high temperature air to the solid surfaces. The detrimental heating can burn the surface material [22]. Also, the steep spatial difference of the heating rates can produce a large thermal stress, sharply reducing the service life of the materials [23].…”

Section: Introductionmentioning

confidence: 99%

Aerothermal characteristics of bleed slot in hypersonic flows

Yue

et al. 2015

Sci. China Phys. Mech. Astron.

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Two types of flow configurations with bleed in two-dimensional hypersonic flows are numerically examined to investigate their aerodynamic thermal loads and related flow structures at choked conditions. One is a turbulent boundary layer flow without shock impingement where the effects of the slot angle are discussed, and the other is shock wave boundary layer interactions where the effects of slot angle and slot location relative to shock impingement point are surveyed. A key separation is induced by bleed barrier shock on the upstream slot wall, resulting in a localized maximum heat flux at the reattachment point. For slanted slots, the dominating flow patterns are not much affected by the change in slot angle, but vary dramatically with slot location relative to the shock impingement point. Different flow structures are found in the case of normal slot, such as a flow pattern similar to typical Laval nozzle flow, the largest separation bubble which is almost independent of the shock position. Its larger detached distance results in 20% lower stagnation heat flux on the downstream slot corner, but with much wider area suffering from severe thermal loads. In spite of the complexity of the flow patterns, it is clearly revealed that the heat flux generally rises with the slot location moving downstream, and an increase in slot angle from 20° to 40° reduces 50% the heat flux peak at the reattachment point in the slot passage. The results further indicate that the bleed does not raise the heat flux around the slot for all cases except for the area around the downstream slot corner. Among all bleed configurations, the slot angle of 40° located slightly upstream of the incident shock is regarded as the best.

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