Special Issue "Flow Control and Drag Reduction"
Deadline for manuscript submissions: 28 February 2023 | Viewed by 1264
Interests: aerodynamics; flight control; active flow control; synthetic jet; plasma synthetic jet; thermal management; icing and deicing control; air-breathing propulsion power
Drag reduction is an eternal and hot topic in the design of low- and high-speed aircraft as well as underwater vehicles in order to achieve the purpose of saving fuel, improving speed, and increasing range. The conventional method of reducing drag through shape optimization has met a development bottleneck, whereas the adoption of certain flow control measures to affect the flow around various shapes can improve its drag characteristics and even the stealthy performance of the aircraft. Flow control can be applied to delay/advance transition, inhibit/promote flow separation, enhance/weaken flow stability, increase shock wave control, etc., so as to achieve drag reduction, which has broad application prospects and research value. This Special Issue will include the following topics: flow control techniques, flow separation control, lift enhancement and drag reduction, flight control, laminar flow control, transition control, turbulence drag reduction, shock wave control, SWBLI control, and other applications to cause drag reduction.
Prof. Dr. Zhenbing Luo
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
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- passive flow control
- active flow control
- flow separation control
- lift enhancement and drag reduction
- laminar flow control
- transition control
- turbulence drag reduction
- shock wave control
- SWBLI control
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Abstract: Previous studies have implied that the AR (aspect ratio) of the transverse groove significantly affects the stability of the boundary vortex within the groove and thus drives the variation in drag-reduction rate. However, there is no theoretical model describing the relationship between AR and the stability of the boundary vortex, resulting in difficulty in developing a forward method to obtain the optimum AR. In this paper, the velocity potential of the groove sidewalls to the boundary vortex is innovatively described by an image vortex model, thus establishing the relationship between the AR and the induced velocity. Secondly, the velocity profile of the migration flow is obtained by decomposing the total velocity inside the groove, by which the relationship between the AR and the migration velocity is established. Finally, the analytical solution of the optimal AR (AR_opt=2.15) is obtained based on the kinematic condition for boundary vortex stability, i.e., the induced velocity equals the migration velocity, and the forms of boundary vortex motion at other ARs are discussed. Furthermore, the stability of the boundary vortex at the optimal AR and the corresponding optimal drag-reduction rate are verified by the large eddy simulations method. At other ARs, the motion forms of boundary vortex are characterized by “vortex shedding” and “vortex sloshing,” respectively, and the corresponding drag-reduction rates are smaller than those for vortex stability.