Sphere and Cone Drag Coefficients in Hypersonic Transitional Flow PDF Download
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Author: J. J. Smolderen
Publisher:
ISBN:
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 5
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Book Description
The drag forces experienced by a sphere and a sharp slender cone were measured under hypersonic rarefied flow conditions using a flow modulation technique. The resulting drag coefficients are in substantial agreement with those obtained by other investigators, and extend, by nearly two orders of magnitude in the case of the cone, to more rarefied conditions than previously reported.
Author: J. J. Smolderen
Publisher:
ISBN:
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 5
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Book Description
The drag forces experienced by a sphere and a sharp slender cone were measured under hypersonic rarefied flow conditions using a flow modulation technique. The resulting drag coefficients are in substantial agreement with those obtained by other investigators, and extend, by nearly two orders of magnitude in the case of the cone, to more rarefied conditions than previously reported.
Author: Marvin I. Kussoy
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 20
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Book Description
Author:
Publisher:
ISBN:
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 28
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Book Description
Author: John F. Wendt
Publisher:
ISBN:
Category :
Languages : en
Pages : 43
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Book Description
A modulated force probe with a sensitivity in the microgram range was employed to measure the drag forces on spheres in the Mach 5 range with an R.M.S. error of + or - 1%. Flow properties in the free jet were used to calculate sphere drag coefficients. The resulting values cover the flow regimes from near-free-molecule to transitional. A correlation parameter - an 'effective' Knudsen number based on body-free stream molecular collisions - is shown to provide a reasonable correlation for a large variety of sphere drag measurements.
Author: C. R. Ortloff
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
A survey of numerical results of low-density transitional regime drag coefficients and number density distributions about slender, cold-wall, conical vehicles at hypersonic speeds is presented. The transitional regime results have been obtained from numerical solutions of Rosen's restricted variational principle representation of the Boltzmann equation, which has been shown to be equivalent at Galerkin's method of solution of operator equations. Transitional regime drag coefficients are compared with near free molecule and viscous interaction predictions of drag coefficients. Number density profiles for the transitional regime are also given and compared with known qualitative features of near continuum flow fields to assess the validity of results obtained by the variational method. Results indicate that the drag coefficient varies smoothly from known viscous interaction predictions and reaches the limiting value of 2 when the freestream Knudsen number is on the order of unity for the class of slender cones considered. A decrease of cone-half-angle, with Knudsen number fixed, results in a steeper rise of the drag coefficient curve toward the limiting high Knudsen number value of 2. For cone half-angles on the order of 5 degrees, the drag coefficient curve exhibits an overshoot over the free molecule value. (Author).
Author: Allen H. Whitehead (Jr.)
Publisher:
ISBN:
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 44
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Book Description
Flow field and drag characteristics of several laminar boundary layer tripping element in hypersonic flow.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 140
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Book Description
Analytical expressions have been developed for determining drag coefficients for cones and spheres. An error analysis is presented in which the resulting drag equations are compared to wind tunnel and ballistic range data, and some limited flight test data. Also presented are the results of an investigation aimed at determining the altitude range where a conical or spherical re-entry vehicle will undergo boundary layer transition.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Book Description
Author: Charles R. Ortloff
Publisher:
ISBN:
Category : Boundary layer control
Languages : en
Pages : 26
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Book Description
A general expression for the drag coefficient for a slender conical vehicle moving at hypersonic velocity in the low density transitional flow regime is obtained in this note. The method of calculation of C sub D follows from Rosen's variational method of solution of the Boltzmann equation previously reported by the author in the literature. The theoretically predicted drag coefficient from the variational method is given in the Knudsen number range .01
Author: G. G. Chernyi
Publisher: Academic Press
ISBN: 1483271684
Category : Technology & Engineering
Languages : en
Pages : 277
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Book Description
Introduction to Hypersonic Flow has been made available to the English speaking reader because of its usefulness for those individuals desirous of obtaining an introduction to the subject. Written by an internationally acknowledged expert in the field of hypersonic flow, the book makes available heretofore unpublished Soviet work, as well as published work little known outside the Soviet Union. The author has however made every effort to include, where appropriate. Western references for the work he discusses. Starting with a general introductory chapter on hypersonic aerodynamics and aerodynamic problems, the remainder of the book concentrates on the inviscid, perfect fluid aspects of hypersonic flow, with emphasis on the fundamental concepts and rational methods of calculation. The book is directed to students of aerodynamics and gas dynamics, as well as to scientists and engineers interested in problems of hypersonic flight. The level of approach is such that it should prove particularly useful as an undergraduate and introductory graduate text.
