منابع مشابه
Coda: Transonic Airfoils and SLE
We close by describing two rather unusual applications of complex variables. The details are beyond the scope of this book, but the ideas involved definitely deserve mention. The first area of application is fluid dynamics. It was observed already in the nineteenth century that the equations describing the incompressibility and irrotationality of fluids are just the Cauchy-Riemann equations for...
متن کاملAdaptive Airfoils for Drag Reduction at Transonic Speeds
Adaptive airfoils and wings can provide superior performance at the expense of increased cost and complexity. In this paper, an aerodynamic optimization algorithm is used to assess an adaptive airfoil concept for drag reduction at transonic speeds. The objective is to quantify both the improvements in drag that can be achieved and the magnitude of the shape changes needed. In an initial study, ...
متن کاملTransonic Flows about Oscillating Airfoils Using the Euler Equations
T r a n s o n i c f l ow o v e r a h a r m o n i c a l l y o s c i l l a t i n g a i r f o i l is computed by s o l v i n g t h e two-dimens ional E u l e r e q u a t i o n s i n i n t e g r a l form u s i n g t h e f i n i t e volume scheme. The d i s s i p a t i o n t e rms a r e c o n s t r u c t e d a c c o r d i n g t o t h e o r y of t o t a l v a r i a t i o n d i m i n i s h i n g schem...
متن کاملOptimum Transonic Airfoils Based on the Euler Equations
We solve the problem of determining airfoils that approximate, in a least square sense, given surface pressure distributions in transonic flight regimes. The flow is modeled by means of the Euler equations and the solution procedure is an adjointbased minimization algorithm that makes use of the inverse Theodorsen transform in order to parameterize the airfoil. Fast convergence to the optimal s...
متن کاملIterative Solution of Transonic Flows over Airfoils and Wings,
Transonic aerodynamics is the focus of strong interest at the present time because it is known to encompass one of the most efficient regimes of flight. While current transport aircraft operate just below the speed of sound, more radical aerodynamic designs, such as R. T. Jones’ proposal for a yawed wing in [1], favor operation at low supersonic speeds in the range from Mach 1 to 1.3 (a regime ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Japan Society for Aeronautical and Space Sciences
سال: 1979
ISSN: 0021-4663
DOI: 10.2322/jjsass1969.27.672