Drag Reduction Mechanism of Array Microslit-Opposed Jets in the Passivation Leading Edge of High-Speed Aircrafts
Publication: Journal of Aerospace Engineering
Volume 37, Issue 4
Abstract
In order to meet the demanding drag reduction requirements of high-speed aircraft, the drag reduction mechanism of array microslit-opposed jets in the passivation leading edge is studied using a numerical method based on the shear stress transfer (SST) two-path turbulence model. The computations are performed with the commercial CFD solver FLUENT 13.0 code. The interference characteristics of the array jets are analyzed, the influence laws of the microslit array mode and the angle of attack on drag reduction performance are explored, and a prediction method of passivation leading edge drag characteristics based on radial basis function (RBF) neural network is constructed. The research conditions are as follows: the incoming Mach number is 2.0, the angle of attack ranges from 0° to 30°, and the number of microslits is 0 to 5. The results show that when there is interference between microslit jets, the interaction between adjacent reverse reflux regions will change the shape of the reflux regions. When there is a microslit jet in the center line, the position of the detached shock wave is more affected by the angle of attack. The drag characteristics of the leading edge are determined by the location of the detached shock wave and the characteristics of the reflux regions. The mode of microslits determines the drag reduction efficiency and sensitivity to the angle of attack. There may be contradictions in the design of array microslit-opposed jet schemes regarding the overall drag reduction efficiency, local load, and drag reduction stability. The drag prediction model based on the RBF neural network has an accuracy of 5%, which can provide support for the design of array microslit-opposed jets.
Practical Applications
The array microslit-opposed jets provide a new technical approach for reducing drag on the passivation leading edge. The paper studies its flow characteristics and laws and provides relevant conclusions. It can serve as a theoretical reference during design. The number of microslits is not the more the better. When designing microslit patterns, many factors need to be considered.
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Data Availability Statement
Some or all of the data, models, or codes supporting this study are available from the corresponding author upon reasonable request.
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Information & Authors
Information
Published In
Journal of Aerospace Engineering
Volume 37 • Issue 4 • July 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jul 27, 2023
Accepted: Jan 8, 2024
Published online: Mar 22, 2024
Published in print: Jul 1, 2024
Discussion open until: Aug 22, 2024
ASCE Technical Topics:
- Aerospace engineering
- Aircraft and spacecraft
- Artificial intelligence and machine learning
- Computer programming
- Computing in civil engineering
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Fluid mechanics
- Hydrologic engineering
- Methodology (by type)
- Model accuracy
- Models (by type)
- Neural networks
- Numerical methods
- Shear resistance
- Shear stress
- Shock waves
- Solid mechanics
- Stress (by type)
- Structural analysis
- Structural engineering
- Viscosity
- Water and water resources
- Waves (mechanics)
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