A Study of Aerodynamic Drag Forces in the Transition from Continuum to Free Molecular Flow PDF Download
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Author: K. S. Hadjimichalis
Publisher:
ISBN:
Category :
Languages : en
Pages : 144
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Book Description
Author: K. S. Hadjimichalis
Publisher:
ISBN:
Category :
Languages : en
Pages : 144
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Book Description
Author: George J. Maslach
Publisher:
ISBN:
Category : Air resistance
Languages : en
Pages : 40
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Book Description
Author: Y. Y. Lin Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 100
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Book Description
The drag coefficient of an object moving in a rarefied gas can be expanded in terms of the inverse Knudsen number. In the reported equation one term represents the drag coefficient in the free molecular flow limit. It is shown that a second coefficient is determined by a set of well defined collision integrals associated with sequences of successive collisions among two molecules and the object. These collision integrals are evaluated for a disc and a sphere assuming that the gas molecules are reflected diffusively by the object. The molecules are treated as hard spheres and the drag coefficient is studied as a function of the velocity of the object. (Modified author abstract).
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 296
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author: A. B. Bailey
Publisher:
ISBN:
Category :
Languages : en
Pages : 97
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Book Description
A comprehensive set of measurements was made in a ballistic range which permits the sphere drag coefficient to be derived with an uncertainty of approximately +2 or -2 percent in the flight regime 0.1
Author: Marie H. Tuttle
Publisher:
ISBN:
Category : Magnetic balances
Languages : en
Pages : 52
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Author: George J. Maslach
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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The experimental results indicate a smooth transition from continuum drag coefficient values to predicted free molecular flow drag coefficients. Normalization of the measured drag values reveals a marked Mach number dependency. Future experimental programs are indicated, including extension to higher and lower Mach numbers, and a detailed pressure survey of the entire cylinder surface. (Author).
Author: William A. Kuperman
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 350
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Author: Donald Roger Willis
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
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Using the integral iteration method, theoretical results are obtained for aerodynamic drag and heat transfer in the nearly free molecular regime. The geometries considered are: circular cylinders, inclined flat plates, and wedges, all two dimensional. Perturbation to the free molecular results are obtained correct to order (1/Kn) ln Kn only (Kn is the Knudsen number). The free stream speed ratio is greater than two and the body temperatures range from free stream to recovery. The results are similar to those obtained previously for a normal flat strip, except that for small angle wedges and flat strips at small angles of attack, the drag coefficient is predicted to exceed the free molecular value. (Author).
