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Aerospace 2018, 5(1), 19; doi:https://doi.org/10.3390/aerospace5010019

Thrust Augmentation by Airframe-Integrated Linear-Spike Nozzle Concept for High-Speed Aircraft

1
Japan Aerospace Exploration Agency, Kakuda, Miyagi 981-1525, Japan
2
Hitachi Solutions East Japan, Ltd., Sendai, Miyagi 980-0014, Japan
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 8 December 2017 / Revised: 2 February 2018 / Accepted: 6 February 2018 / Published: 9 February 2018
(This article belongs to the Special Issue Propulsion/Airframe Integration)
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Abstract

The airframe-integrated linear-spike nozzle concept applied to an external nozzle for high-speed aircraft was evaluated with regard to the thrust augmentation capability and the trim balance. The main focus was on the vehicle aftbody. The baseline airframe geometry was first premised to be a hypersonic waverider design. The baseline aftbody case had an external nozzle comprised of a simple divergent nozzle and was hypothetically replaced with linear-spike external nozzle configurations. Performance evaluation was mainly conducted by considering the nozzle thrust generated by the pressure distribution on the external nozzle surface at the aftbody portion calculated by computer simulation at a given cruise condition with zero angle of attack. The thrust performance showed that the proposed linear-spike external nozzle concept was beneficial in thrust enhancement compared to the baseline geometry because the design of the proposed concept had a compression wall for the exhaust flow, which resulted in increasing the wall pressure. The configuration with the boattail and the angled inner nozzle exhibited further improvement in thrust performance. The trim balance evaluation showed that the aerodynamic center location appeared as acceptable. Thus, benefits were obtained by employing the airframe-integrated linear-spike external nozzle concept. View Full-Text
Keywords: supersonic/hypersonic transport; linear aerospike nozzle; airframe-propulsion integration; aftbody external nozzle supersonic/hypersonic transport; linear aerospike nozzle; airframe-propulsion integration; aftbody external nozzle
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Takahashi, H.; Munakata, T.; Sato, S. Thrust Augmentation by Airframe-Integrated Linear-Spike Nozzle Concept for High-Speed Aircraft. Aerospace 2018, 5, 19.

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