Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

Get Book Here

Book Description

Author: J. J. Smolderen
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 30

Get Book Here

Book Description
A new technique to accurately measure low level forces and its application to the determination of drag coefficients in rarefied hypersonic flow are described. Preliminary results are presented for cylinders and spheres at M = 8 in the transitional and near-free-molecule flow regimes. (Author).

Author: Jerome Aroesty
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 318

Get Book Here

Book Description
Sphere drag coefficients were measured in the Berkeley Low Density Wind Tunnel at Mach equals 2, 4, and 6, and free stream Reynolds numbers between 10 and 10,000 for both insulated and cold wall conditions. The measurements indicate that sphere drag in this regime is strongly dependent on the Reynolds number behind a normal shock wave, and only weakly dependent on Mach number. In addition, it was found that a decrease in wall temperature/stagnation temperature (T sub w/T sub o) from 1 to 0.26 was accompanied by a 5 - 10% decrease in the drag coefficient. A precision microbalance was used to obtain data for insulated spheres, and a moving model technique was used to obtain data for small spheres falling freely through a wind tunnel jet. These latter tests were performed using both cold and insulated models. The results on insulated spheres at M equal 2 and 4 were in good agreement with the measurements of other investigators. The results of the cold wall tests indicate that for Mach numbers greater than 5 in air, sphere drag coefficients are a function only of T sub w/T sub o and the post normal shock Reynolds number. (Author).

Author: R. E. Geiger
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 0

Get Book Here

Book Description
The free flight technique was extended to low density flows to measure sphere drag at approximately Mach 15 over a free stream Knudsen number range of .0027 to .25. Comparison of the data obtained with those of other investigators indcates that : a) The free flight technique is useful for shock tunnel measurements of aerodynamic forces in non-continuum flows. b) There is little to choose from between Kn[subscript infinity], Re[subscript infinity], Re2 as a correlating variable for experimental sphere drag coefficients. (c) The parameter C [subscript D] - C [subscript Di] over C [subscript Dfm] - C [subscriptDi] yields a useful correlatin of sphere drag over a wide range of Mach numbers, Reynolds number and wall temperatures.

Author: Ascher H. Shapiro
Publisher:
ISBN:
Category : Drag (Aerodynamics).
Languages : en
Pages : 202

Get Book Here

Book Description

Author: G. Hetsroni
Publisher: Elsevier
ISBN: 1483160505
Category : Science
Languages : en
Pages : 779

Get Book Here

Book Description
Proceedings of the International Symposium on Two-Phase Systems

Author: R. E. Geiger
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 14

Get Book Here

Book Description
The free flight technique was extended to low density flows to measure sphere drag at approximately Mach 15 over a free stream Knudsen number range of .0027 to .25. Comparison of the data obtained with those of other investigators indcates that : a) The free flight technique is useful for shock tunnel measurements of aerodynamic forces in non-continuum flows. b) There is little to choose from between Kn[subscript infinity], Re[subscript infinity], Re2 as a correlating variable for experimental sphere drag coefficients. (c) The parameter C [subscript D] - C [subscript Di] over C [subscript Dfm] - C [subscriptDi] yields a useful correlatin of sphere drag over a wide range of Mach numbers, Reynolds number and wall temperatures.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1134

Get Book Here

Book Description

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 296

Get Book Here

Book Description

Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1318

Get Book Here

Book Description