Transonic Flow (2nd Edition)

A special issue of Aerospace (ISSN 2226-4310). This special issue belongs to the section "Aeronautics".

Deadline for manuscript submissions: closed (31 October 2024) | Viewed by 1061

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Department of Aerospace Engineering, Cranfield University, Cranfield MK43 0AL, UK
Interests: aerodynamics; computational fluid dynamics; fluid mechanics; gas dynamics; fluid turbulence; experimental fluid mechanics; flow
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Dear Colleagues,

Transonic flow research has been of critical importance since the development of high-speed propellor aeroplanes and turbojet engines in the mid-1940s. The transonic flow regime has been, and remains, a challenge both for computational prediction and experimental simulation. The close coupling of shock waves, arising from the compressibility of air, and the effects of viscous flow on aircraft surfaces lead to highly unsteady and complicated flows that often involve detrimental flow separations. These can result in unsteady loading, potentially causing structural vibrations of aircraft components. An understanding of unsteady transonic flow is therefore fundamental to the safe design of high-speed aircraft.

Today’s aircraft industry is required to develop revolutionary new aircraft concepts to address the aviation impact on climate change and noise. This involves driving reassessments in design philosophy to achieve step changes in aerodynamic and propulsive efficiency, involving a much closer coupling of aircraft fuselage, wings, and engines. Emerging data on the transonic performance of these revolutionary designs have revealed how different the flows are to those associated with conventional tube and swept-wing designs.

Transonic flow research therefore remains critical to the development of high-speed aircraft today, and it is fitting that this Special Issue of Aerospace is devoted to this important topic.

Prof. Dr. Simon Prince
Guest Editor

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Keywords

  • transonic flow
  • shock wave
  • buffet
  • boundary layer interaction
  • computational fluid dynamics
  • wind tunnel testing

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Published Papers (1 paper)

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Research

19 pages, 10184 KiB  
Article
Coupling Analysis between the Transonic Buffeting Flow and a Heaving Supercritical Airfoil Based on Dynamic Mode Decomposition
by Wei Kang, Bingzhou Chen and Shilin Hu
Aerospace 2024, 11(9), 722; https://doi.org/10.3390/aerospace11090722 - 3 Sep 2024
Viewed by 714
Abstract
The coupling between a transonic buffeting flow and a supercritical airfoil with harmonic heave motion was studied. A parametric space of the heave frequency and amplitude was investigated using a verified fluid–structural interaction framework. The spatial-temporal flow pattern around the transonic airfoil was [...] Read more.
The coupling between a transonic buffeting flow and a supercritical airfoil with harmonic heave motion was studied. A parametric space of the heave frequency and amplitude was investigated using a verified fluid–structural interaction framework. The spatial-temporal flow pattern around the transonic airfoil was studied using dynamic mode decomposition (DMD) to unveil the physical coupling mechanism. The results show three types of flow responses under the heave motion: (I) A buffet frequency response with a λ-shape shock wave structure and recirculation zone at the shock foot. The aerodynamic performance was alike the scenario in the flow past the stationary airfoil. (II) A transitional response with a weakened shock and enhanced boundary layer. The aerodynamic performance deteriorated sharply at f=fbuffet and recovered after the frequency was past the buffet frequency. The flow pattern was characterized by a double-shock structure that interacted with the enhanced boundary layer. (III) A heave frequency response with the dominant heave motion. The variance in the aerodynamic loading increased significantly at f>fbuffet and there were higher heave amplitudes in this stage. The driving motion of the airfoil transferred the energy of the buffet mode to the boundary layer with a more even energy balance according to the energy contribution analysis of the DMD modes. Full article
(This article belongs to the Special Issue Transonic Flow (2nd Edition))
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