Propulsion aerodynamics for a novel high-speed exhaust system

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dc.contributor.authorTsentis, Spyros
dc.contributor.authorGoulos, Ioannis
dc.contributor.authorPrince, Simon
dc.contributor.authorPachidis, Vassilios
dc.contributor.authorZmijanovic, Vladeta
dc.date.accessioned2023-09-15T14:37:25Z
dc.date.available2023-09-15T14:37:25Z
dc.date.issued2023-09-13
dc.description.abstractA key requirement to achieve sustainable high-speed flight and efficiency improvements in space access, lies in the advanced performance of future propulsive architectures. Such concepts often feature high-speed nozzles, similar to rocket engines, but employ different configurations tailored to their mission. This paper presents a numerical investigation on the aerodynamic performance of a representative novel exhaust system, which employs a high-speed, truncated, ideal contoured nozzle and a complex-shaped cavity region at the base. Reynolds-Averaged Navier-Stokes computations are performed for a number of Nozzle Pressure Ratios (NPRs) and free stream Mach numbers in the range of 2.7 < NPR < 24 and 0.7 < M∞ < 1.2 respectively. The corresponding Reynolds number lies within the range of 1.06 · 106 < Red < 1.28 · 106 based on the maximum diameter of the configuration. The impact of the cavity on the aerodynamic characteristics is revealed by direct comparison to an identical non-cavity configuration. Results show a consistent trend of increasing base drag with increasing NPR for all examined M∞ for both configurations, owing to the jet entrainment effect. Cavity is found to have no impact on the incipient separation location of the nozzle flow. At conditions of M∞ = 1.2 and high NPRs, the cavity has a significant effect on the aerodynamic performance, transitioning nozzle operation to under-expanded conditions. This results in approximately 12% higher drag coefficient compared to the non-cavity case and shifts the minimum NPR for which the system produces positive gross propulsive force to higher values.en_UK
dc.identifier.citationTsentis S, Goulos I, Prince S, et al., (2023) Propulsion aerodynamics for a novel high-speed exhaust system. Journal of Engineering for Gas Turbines and Power, Volume 145, Issue 12, December 2023, Article number 121011, Paper number GTP-23-1339en_UK
dc.identifier.issn0742-4795
dc.identifier.urihttps://doi.org/10.1115/1.4063416
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/20222
dc.language.isoenen_UK
dc.publisherAmerican Society of Mechanical Engineersen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectAerodynamicsen_UK
dc.subjectExhaust systemsen_UK
dc.subjectPropulsionen_UK
dc.subjectCavitiesen_UK
dc.subjectNozzlesen_UK
dc.subjectDrag (Fluid dynamics)en_UK
dc.subjectArchitectureen_UK
dc.subjectComputationen_UK
dc.subjectFlighten_UK
dc.subjectFlow (Dynamics)en_UK
dc.subjectMach numberen_UK
dc.subjectPressureen_UK
dc.subjectReynolds numberen_UK
dc.subjectRocket enginesen_UK
dc.subjectSeparation (Technology)en_UK
dc.subjectSustainabilityen_UK
dc.titlePropulsion aerodynamics for a novel high-speed exhaust systemen_UK
dc.typeArticleen_UK

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