Technical Brief

Thermal and Thermomechanical Performances of Pyramidal Core Sandwich Panels Under Aerodynamic Heating

[+] Author and Article Information
Gongnan Xie

Department of Mechanical and Power Engineering,
Northwestern Polytechnical University,
P.O. Box 24,
Xi'an 710072, Shaanxi, China
e-mail: xgn@nwpu.edu.cn

Ruiping Zhang

School of Mechanical Engineering,
Northwestern Polytechnical University,
P.O. Box 552,
Xi'an 710072, Shaanxi, China
e-mail: zhangruiping@mail.nwpu.edu.cn

Oronzio Manca

Dipartimento di Ingegneria Industriale e dell'Informazione,
Seconda Universita' degli Studi di Napoli,
Real Casa dell'Annunziata,
Via Roma 29,
Aversa (CE) 81031, Italy
e-mail: oronzio.manca@unina2.it

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received February 23, 2016; final manuscript received August 24, 2016; published online November 8, 2016. Assoc. Editor: Dr. Steve Q. Cai.

J. Thermal Sci. Eng. Appl 9(1), 014503 (Nov 08, 2016) (9 pages) Paper No: TSEA-16-1047; doi: 10.1115/1.4034914 History: Received February 23, 2016; Revised August 24, 2016

According to the particular aerodynamic heating loads which hypersonic aerospace aircrafts suffered from in-service environment, a lightweight integrated thermal protection system (ITPS) named pyramidal core sandwich panel is designed. This is considered not only as an insulation structure but also a load-bearing structure. Compared to traditional thermal protection systems (TPSs), the sandwich panel has simultaneous lightweight, load-bearing, and excellent thermal protection property. The finite-element heat transfer analysis for the pyramidal core sandwich structure is performed, and the distributions of temperature in the structure are presented. Then sequential coupling method is adopted to analyze the thermomechanical performance of the structure and presentations of field of stress and displacement under aerodynamic and thermal load are provided. A comparison between corrugated-core sandwich panels and pyramidal core sandwich panels from the perspectives of heat insulation, strength, and mass is carried out. The results indicate that the particular performance of pyramidal-core structure is superior to that of corrugated-core structure.

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Fig. 1

Geometry under investigation: (a) the typical pyramidal core sandwich panel for thermal protection thermal system consists of top face sheet, pyramidal core, and bottom face sheet and (b) the simplified geometry of the pyramidal unit-cell, two thin face sheets with the thickness of td and bd, respectively, and pyramidal core with the inclined angel of θ

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Fig. 2

The temperature and deviation of different mesh density at the selected time point

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Fig. 3

The FE model for pyramidal core sandwich panel: (a) discretization for complete model which consists of top face sheet, bottom face sheet, pyramidal truss core, and Saffil insulation and (b) discretization for pyramidal core sandwich panel (Saffil insulation is not shown in the figure)

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Fig. 4

Quantities as a function of re-entry time: (a) transient heat flux applied on hot boundary (top surface), the thermal load is referred to document [19] and (b) radiation equilibrium temperature on the top surface of the TFS when incident heat flux is applied

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Fig. 5

The locations of the three feature points in finite model which locate in the TFS, the BFS, and the midpoint in the structure, respectively

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Fig. 6

Temperature variation versus re-entry times for feature points of the: (a) pyramidal core sandwich panel and (b) corrugated-core sandwich panel. The temperature variation in the TFS is nearly identical to radiation equilibrium temperature.

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Fig. 7

Comparison of temperature with respect to time between reference results and predicted results from Ref. [21]: (a) the temperature variation in the TFS and (b) the temperature in the BFS. (The trend and feature are almost the same between the predicted results and the simulation results).

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Fig. 8

The comparison for the temperature of the bottom surface of the BFS between the corrugated core and the pyramidal

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Fig. 9

Four feature points with specific constrains located at the bottom surface

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Fig. 10

Von Mises stress contour when only thermal load is applied to the: (a) pyramidal core structure (the maximum thermal stress appears in the upper part of the lattice frame near the TFS) and (b) corrugated core sandwich panel (the maximum thermal stress occurs in the middle of the web)

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Fig. 11

Displacement vector sum contour when only thermal load is applied to the: (a) pyramidal core sandwich panel and (b) corrugated core sandwich panel

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Fig. 12

Von Mises stress contour in pressure of: (a) 10,000 Pa, (b) 15,000 Pa, and (c) 30,000 Pa and temperature load. (The maximum thermal stress appears in the center of the TFS).

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Fig. 13

Displacement vector sum contour in pressure of: (a) 10,000 Pa, (b) 15,000 Pa, and (c) 30,000 Pa and temperature load




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