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Research Papers: Thermal Systems

Thermal Performance Evaluation of Cork Phenolic for Nozzle External Thermal Protection System Using 250 kW Plasma Jet Facility

[+] Author and Article Information
L. Aravindakshan Pillai, N. Sreenivas, K. Krishnaraj, Vinay Unnikrishnan, M. Ajith

Vikram Sarabhai Space Centre,
Thiruvananthapuram 695022, India

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received December 10, 2016; final manuscript received January 11, 2018; published online April 11, 2018. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 140(7), 072801 (Apr 11, 2018) (7 pages) Paper No: HT-16-1798; doi: 10.1115/1.4039584 History: Received December 10, 2016; Revised January 11, 2018

In one of the launch vehicles of ISRO, there are two solid strap-ons attached to the core liquid engine. During the ascent phase, the external nozzle divergent of the strap-ons experiences heating due to radiation from the strap-ons as well as convective heating from the impingement of plumes from the core engine. Hence, the nozzle divergent of the strap-on beyond compliance ring is thermally protected by a coating of PC10 insulation applied over carbon/epoxy structural backup. Though the system worked satisfactorily, application of PC10 had increased the inert weight of each nozzle by 165 kg and took long time for realization. To reduce the inert weight as well as the time of application, precast phenolic based cork sheets (CkP) having lower density than PC10 were selected, as a replacement to PC10. As part of evaluating the thermal performance of the CkP material, specimen level tests with different configurations were carried out in 250 kW plasma jet facility of Vikram Sarabhai Space Centre (VSSC) wherein both the heat flux and the shear stress as expected in flight were simulated simultaneously. At the end of the test program, CkP was found to be superior to PC10 for external thermal protection system (TPS). This paper highlights details of the qualification tests carried out for clearing the cork phenolic system for use in the future launches.

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References

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Figures

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Fig. 1

View of the nozzle divergent

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Fig. 2

250 kW plasma jet facility

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Fig. 3

Heat flux probe assembly and calibration in progress

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Fig. 4

Discretized domain

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Fig. 5

Temperature (K) contour

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Fig. 6

Shear stress variation

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Fig. 7

Velocity (m/s) contour

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Fig. 8

Shear stress variation

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Fig. 9

Two-layer CkP specimen

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Fig. 10

Typical test specimen. Rear view and in-depth thermocouples are also shown.

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Fig. 13

6-mm-thick two-sheet CkP specimen

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Fig. 14

12-mm-thick one-sheet CkP specimen

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Fig. 15

Cork phenolic samples (three layer)

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Fig. 16

12-mm-thick two-sheet CkP

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Fig. 17

12-mm-thick three-sheet CkP specimen

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Fig. 18

Post-test photo of PC10 specimen

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Fig. 19

Post-test photo of CkP specimen

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