Lift Enhancement of Supersonic Thin Airfoil at Low Speed by Co-Flow Jet Active Flow Control

2021 ◽  
Author(s):  
Zhijin Lei ◽  
Gecheng Zha
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Low Speed ◽  
Thin Airfoil ◽  
Lift Enhancement ◽  
Active Flow

scholarly journals Active flow control at a 1.5-stage low-speed research compressor with varying rotor tip clearance

2011 ◽  
Vol 225 (7) ◽  
pp. 886-896 ◽  
Author(s):  
M Künzelmann ◽  
R Urban ◽  
R Mailach ◽  
K Vogeler
Keyword(s):  
Flow Control ◽  
Active Flow Control ◽  
Axial Compressor ◽  
Rotating Stall ◽  
Tip Clearance ◽  
Stall Inception ◽  
Low Speed ◽  
Operating Range ◽  
Compressor Rotor ◽  
Active Flow

The stable operating range of axial compressors is limited by the onset of rotating stall and surge. Mass injection upstream of the tip of an axial compressor rotor is a stability enhancement approach which can be effective in suppressing stall in tip-critical rotors, and thus increasing the operating range of compressors. In this article, investigations on active flow control related to the rotor tip gap sensitivity are discussed. The experiments were performed in a 1.5-stage low-speed research compressor. Measurements at part speed (80 per cent) and full speed (100 per cent) with varying injection rates are discussed. These tests were performed for two rotor tip clearances of 1.3 per cent and 4.3 per cent of rotor blade tip chord. Results on the compressor map, the flow field as well as transient measurements to identify the stall inception are discussed. Supplementary, the numerical results are compared to the experiments based on the configuration with the greatest benefit in operating range enhancement.

Active flow control concepts and application opportunities

2017 ◽  
Vol 89 (5) ◽  
pp. 725-729 ◽  
Author(s):  
Heribert Bieler
Keyword(s):  
Flow Control ◽  
Skin Friction ◽  
High Speed ◽  
Active Flow Control ◽  
Leading Edge ◽  
Design Activity ◽  
Content Type ◽  
Low Speed ◽  
Significant Step ◽  
Active Flow

Purpose Aerodynamics drives the aircraft performance and, thus, influences fuel consumption and environmental compatibility. Further, optimization of aerodynamic shapes is an ongoing design activity in industrial offices; this will lead to incremental improvements. More significant step changes in performance are not expected from pure passive shape design. However, active flow control is a key technology, which has the potential to realize a drastic step change in performance. Flow control targets two major goals: low speed performance enhancements mainly for start and landing phase via control of separation and drag reduction at high speed conditions via skin friction and shock wave control. Design/methodology/approach This paper highlights flow control concepts and Airbus involvements for both items. To mature flow control systematically, local applications of separation control technology are of major importance for Airbus. In parallel, but at lower maturity level, investigations are ongoing to reduce the turbulent skin friction at cruise. A popular concept to delay separation at low speed conditions is the implementation of jet actuation control systems flush mounted to the wall of aerodynamic components. Findings In 2006, DLR (in collaboration with universities Berlin, Braunschweig and industrial partner Airbus) started to study active flow control for separation delay towards application. Based on basic proof of concepts (achieved in national projects), further flow control hardware developments and wind tunnel and lab testing took place in European funded projects. Originality/value Significant lift enhancements were realized via flow control applied to the wing leading edge and the flap.

scholarly journals Comparative Study of Active Flow Control Strategies for Lift Enhancement of a Simplified High-Lift Configuration

2019 ◽  
Author(s):  
Veer N. Vatsa ◽  
Benjamin M. Duda ◽  
John C. Lin ◽  
LaTunia G. Pack Melton ◽  
David P. Lockard ◽  
...  
Keyword(s):  
Comparative Study ◽  
Flow Control ◽  
Control Strategies ◽  
Active Flow Control ◽  
High Lift ◽  
Lift Enhancement ◽  
Active Flow

Active Flow Control: Low Speed and High Speed Applications

2008 ◽  
Author(s):  
Steffen Mack ◽  
Christoph Brehm ◽  
Wolfgang Balzer ◽  
Jayahar Sivasubramanian ◽  
Hermann Fasel ◽  
...  
Keyword(s):  
Flow Control ◽  
High Speed ◽  
Active Flow Control ◽  
Low Speed ◽  
Active Flow
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