Reflections On Using Potential Flow Codes to Design High-Lift Systems

2022 ◽  
Author(s):  
Gabino Martinez-Rodriguez ◽  
Timothy T. Takahashi
Keyword(s):  
Potential Flow ◽  
High Lift

scholarly journals Effects of wake shapes on high-lift system aerodynamic predictions

2021 ◽  
Author(s):  
William Bissonnette ◽  
Götz Bramesfeld
Keyword(s):  
Potential Flow ◽  
Numerical Stability ◽  
Aerodynamic Performance ◽  
Design Stage ◽  
Aerodynamic Load ◽  
High Lift ◽  
Induced Drag ◽  
Predicting Performance ◽  
Wake Model ◽  
Stability Issues

High-lift devices are commonly modelled using potential flow methods at the conceptual design stage. Often, these analyses require the use of prescribed wake shapes in order to avoid numerical stability issues. The wake type used, however, has an impact on the absolute aerodynamic load predictions, which is why, in general, these methods are used to assess performance changes due to configuration variations. Therefore, a study was completed that compared the predicted aerodynamic performance changes of such variations of high-lift configurations using different wake types. Lift and induced drag results are compared with the results that were obtained using relaxed wakes and various prescribed wake shapes. Specific attention is given to predictions of performance changes due to changes in geometry. It was found that models with wakes that are prescribed below the freestream direction yield the best results when investigating performance changes due to flap deflections and flap-span changes. The effect of flap-gap sizes is best evaluated using a fully-relaxed model. The numerically most stable approach of wakes that are prescribed leaving the trailing edge upwards seems to be least reliable in predicting performance changes. Keywords: potential flow; wake model; high-lift

Aerodynamics for Engineers

2021 ◽  
Author(s):  
John J. Bertin ◽  
Russell M. Cummings
Keyword(s):  
Hypersonic Flow ◽  
Real World ◽  
Potential Flow ◽  
Introductory Courses ◽  
High Lift ◽  
Cambridge University ◽  
Sixth Edition ◽  
Real World Applications ◽  
Core Concepts ◽  
Aircraft Performance

Now reissued by Cambridge University Press, this sixth edition covers the fundamentals of aerodynamics using clear explanations and real-world examples. Aerodynamics concept boxes throughout showcase real-world applications, chapter objectives provide readers with a better understanding of the goal of each chapter and highlight the key 'take-home' concepts, and example problems aid understanding of how to apply core concepts. Coverage also includes the importance of aerodynamics to aircraft performance, applications of potential flow theory to aerodynamics, high-lift military airfoils, subsonic compressible transformations, and the distinguishing characteristics of hypersonic flow. Supported online by a solutions manual for instructors, MATLAB® files for example problems, and lecture slides for most chapters, this is an ideal textbook for undergraduates taking introductory courses in aerodynamics, and for graduates taking preparatory courses in aerodynamics before progressing to more advanced study.

scholarly journals Effects of wake shapes on high-lift system aerodynamic predictions

2021 ◽  
Author(s):  
William Bissonnette ◽  
Götz Bramesfeld
Keyword(s):  
Potential Flow ◽  
Numerical Stability ◽  
Aerodynamic Performance ◽  
Design Stage ◽  
Aerodynamic Load ◽  
High Lift ◽  
Induced Drag ◽  
Predicting Performance ◽  
Wake Model ◽  
Stability Issues

High-lift devices are commonly modelled using potential flow methods at the conceptual design stage. Often, these analyses require the use of prescribed wake shapes in order to avoid numerical stability issues. The wake type used, however, has an impact on the absolute aerodynamic load predictions, which is why, in general, these methods are used to assess performance changes due to configuration variations. Therefore, a study was completed that compared the predicted aerodynamic performance changes of such variations of high-lift configurations using different wake types. Lift and induced drag results are compared with the results that were obtained using relaxed wakes and various prescribed wake shapes. Specific attention is given to predictions of performance changes due to changes in geometry. It was found that models with wakes that are prescribed below the freestream direction yield the best results when investigating performance changes due to flap deflections and flap-span changes. The effect of flap-gap sizes is best evaluated using a fully-relaxed model. The numerically most stable approach of wakes that are prescribed leaving the trailing edge upwards seems to be least reliable in predicting performance changes. Keywords: potential flow; wake model; high-lift

VISCOUS POTENTIAL FLOW ANALYSIS OF STRESS-INDUCED CAVITATION IN AN APERTURE FLOW

2006 ◽  
Vol 16 (7) ◽  
pp. 763-776 ◽  
Author(s):  
T. Funada ◽  
J. Wang ◽  
Daniel D. Joseph
Keyword(s):  
Potential Flow ◽  
Flow Analysis ◽  
Viscous Potential Flow

INFLUENCE OF HIGH-BYPASS-RATIO TURBOFAN JETS ON AERODYNAMIC CHARACTERISTICS OF HIGH-LIFT WING

2015 ◽  
Vol 46 (7) ◽  
pp. 619-629
Author(s):  
Albert Vasilievich Petrov ◽  
Vladimir Fedorovich Tretyakov
Keyword(s):  
Aerodynamic Characteristics ◽  
High Lift ◽  
Bypass Ratio

Validation of computed high-lift flows with significant wind-tunnel effects

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 1884-1892
Author(s):  
Stuart E. Rogers ◽  
Karlin Roth ◽  
Steven M. Nash
Keyword(s):  
Wind Tunnel ◽  
High Lift ◽  
Tunnel Effects
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