Role of Thermal Contact Conductance on Sandwich-Type Metallic Thermal Protection System Profile

Kumar, Rakesh; Palininathan, R.; Kishor, E.; Kumar, G. Sunil; Deependran, B.

doi:10.2514/1.j051544

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…3 and Fig. 4 show the temperature variations at the top and bottom surfaces by the present 1D FDM in comparison with those by Kumar et al [6]. In case I, it is observed that the present time of maximum temperature on outer surface by 1D FDM agrees well with the 3D FEM results, and after that at about 500s the temperature starts to reduce more slowly than FEM and test results, which may be caused by considering of convective heat transfer boundary condition.…”

Section: Advanced Materials Research Vols 912-914supporting

confidence: 73%

“…A new structural model of MTPS similar to Matinez et al [4,5] and Kumar et al [6,8] is established which consists of five layers, as shown in Fig. 1.…”

Section: Thermal Conduction Analysismentioning

confidence: 99%

“…Firstly, a three layer structure model without the Nomex and Ti alloy layer which is similar to Kumar et al [6] is analyzed to verify the 1D FDM. Two typical aerodynamic heating cases of reentry vehicle [6] are considered as the thermal heating boundary conditions for the outer node and…”

Section: Thermal Design Of Mtpsmentioning

confidence: 99%

“…However, for the convenience of the overall structural design, the studies mentioned above did not consider the effect of TCR which may lead to some security risks. Kumar et al [6] established a similar model to Satish et al [7] and analyzed the effect of TCR on heat transfer characteristics with the 3D FEM. Recently, a new direction for MTPS design is the multiple-function optimization, and to which is to study the dynamic characteristics is of key importance, but so far little research has been carried out.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Design and Dynamic Analysis of Metallic Thermal Protection System

Chen

2014

AMR

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Metallic thermal protection system (MTPS) is a key component in space vehicle design. By introducing thermal contact resistance (TCR) on the interface between different layers of MTPS, an one dimensional (1D) thermal conduction model for MTPS with multiple functions is established for thermal design. An optimization method is proposed to determine the thermal parameter by comparing the results of 1D finite differential simulation with the test ones. The thermal mode is analyzed by three dimensional FEM analysis and the results show that the mechanical characteristics of MTPS appear to be asymmetric which provides a new consideration to insulate the fluctuating load.

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Section: Advanced Materials Research Vols 912-914supporting

confidence: 73%

“…A new structural model of MTPS similar to Matinez et al [4,5] and Kumar et al [6,8] is established which consists of five layers, as shown in Fig. 1.…”

Section: Thermal Conduction Analysismentioning

confidence: 99%

Section: Thermal Design Of Mtpsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal Design and Dynamic Analysis of Metallic Thermal Protection System

Chen

2014

AMR

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“…However, measured density of foam-filled aramid honeycomb core which is equal to 83.7 kg/m 3 is accounted for the analysis. Finite element analysis of a sandwich insulator of 200 × 200 × ts(LOX) size as shown in Figure 4 is carried out using 20 node brick element for the equivalent core and eight node shell element for the skin connected using interface element reported by Ramesh Kumar et al 11 All four vertical sides are given insulated boundary conditions. A heat flux of 65 W/m 2 is applied on the bottom surface in the Z direction (see Figure 4).…”

Section: Design Of Sandwich Insulatormentioning

confidence: 99%

Thermo-structural analysis of cryogenic tanks with common bulkhead configuration

Sumith

Kumar

2021

Proceedings of the Institution of Mechanical Engineers, Part G:

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In launch vehicles, cryogenic propulsion stages store liquid oxygen (LOX) at 76 K and liquid hydrogen (LH2) at 20 K, generally in two separate insulated tanks connected through tubular truss components. Consequently, load transfer from the LH2 tank to the LOX tank is very much localized, resulting in a nonoptimal design. This article presents an alternative single tankage design using a common bulkhead (CBH) to enhance the payload capability, which enables maintaining LH2 temperature within a specified temperature when exposed to a temperature gradient. A sandwich insulator using aramid honeycomb embedded with polyimide foam keeps the LH2 temperature within 20 ± 1 K is proposed, based on transient heat transfer analysis for 1000 s. The foam-filled honeycomb core is treated as equivalent foam in the analysis as the thermal conductivity of the core and the foam is quite close. The efficacy of the insulator is established by an experiment to measure the back wall temperature when liquid nitrogen is loaded on the top skin of the panel, and the insulator maintains a temperature gradient of 123 K for 1000 s. A good agreement is obtained between the transient finite element analysis results with experimental data. An externally insulated LOX tank configuration with an optimum length of the skirt–cylinder where the temperature reaches 80 K is arrived at based on slosh, buckling, and thermal analyses. No thermal gradient is found across the thickness of the skirt, while the thermal gradient is observed along the length of the skirt as anticipated. An integrated thermo-structural analysis of the cryo-system is carried out considering temperature-dependent material properties. A positive margin for the skirt is obtained. A payload gain of 366 kg is estimated based on the present study for the new design option with a CBH and skirt as compared to the traditional tubular truss arrangements.

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