Investigation on performance enhancement of flap based on dual synthetic jets

ZHANG Jianyuan; LUO Zhenbing; PENG Wenqiang; LIANG Ruiqi; DENG Xiong; WANG Wanbo; ZHAO Zhijie; LIU Jiefu

doi:10.11729/syltlx20230046

Volume 37 Issue 4

Aug. 2023

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Journal of Experiments in Fluid Mechanics > 2023 > 37(4): 76-86. > DOI: 10.11729/syltlx20230046

ZHANG J Y, LUO Z B, PENG W Q, et al. Investigation on performance enhancement of flap based on dual synthetic jets[J]. Journal of Experiments in Fluid Mechanics, 2023, 37(4): 76-86. DOI: 10.11729/syltlx20230046

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Investigation on performance enhancement of flap based on dual synthetic jets

1.
College of Aerospace Science and Engineering, National University of Defense Technology, Changsha　410073, China
2.
Low Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang　621000, China

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Received Date: April 05, 2023
Revised Date: June 15, 2023
Accepted Date: July 04, 2023

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Abstract

Abstract

When the aircraft is in the process of taking off, landing and flexible maneuvering, flow separation occurs above the flap and rudder which is caused by the large deflection angle. It reduces the performance of the flap and rudder, or even makes them ineffective. In order to solve this problem, a performance enhancement technology of flap based on array dual synthetic jets was proposed. Aiming at seamless flap, the influence of different dual synthetic jets driving parameters on the lift force and flap performance was investigated. The investigation results show that the dual synthetic jets can generate periodic vortex structures above the flap surface, which enhanced the momentum exchange between the low-velocity air in the boundary layer and the main flow. These vortex structures can also strengthen the ability of the boundary layer to resist the adverse pressure gradient. The array dual synthetic jets at the flap can effectively increase the lift force and enhance the flap performance. The flap performance enhancement is more effective when the dimensionless driving frequency is 3.89 and the momentum coefficient is 3.01 × 10^–3. The integrated model of the array dual synthetic jets actuator combined with the wing was designed and fabricated, and the flight test was carried out. The rolling angular velocity could achieve 15.69 (°)/s, which verifies the feasibility and effectiveness of performance enhancement of flap based on dual synthetic jets.
- dual synthetic jet,
- performance enhancement of flap,
- numerical simulation,
- flight test

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