Low-Density Supersonic Sphere Drag with Variable Wall Temperature PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Low-Density Supersonic Sphere Drag with Variable Wall Temperature PDF full book. Access full book title Low-Density Supersonic Sphere Drag with Variable Wall Temperature by D. L. Whitfield. Download full books in PDF and EPUB format.
Author: D. L. Whitfield
Publisher:
ISBN:
Category :
Languages : en
Pages : 47
Get Book Here
Book Description
Force measurements were made to investigate the effect of wall temperature on sphere drag in low-density supersonic flow. Drag data were obtained by fixing flow conditions and changing only the sphere wall temperature. A means of correlating drag data in transition flow is suggested, and its validity is assessed by applying the correlation parameter to this and several other sets of experimental data. (Author).
Author: D. L. Whitfield
Publisher:
ISBN:
Category :
Languages : en
Pages : 47
Get Book Here
Book Description
Force measurements were made to investigate the effect of wall temperature on sphere drag in low-density supersonic flow. Drag data were obtained by fixing flow conditions and changing only the sphere wall temperature. A means of correlating drag data in transition flow is suggested, and its validity is assessed by applying the correlation parameter to this and several other sets of experimental data. (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: Thomas Eugene Chamberlain
Publisher:
ISBN:
Category :
Languages : en
Pages : 94
Get Book Here
Book Description
Hypersonic low density sphere drag measurements were made in a nitrogen free jet at wall-to-total temperature ratios of 0.18, 0.66 and 1.0 and Knudsen numbers, based on the reflected molecule mean free path, of 0.5 to 17. The drag forces were measured with a displacement balance. A cryogenic momentum flow rate probe developed in this research was used to calibrate the free jet. Model temperatures were measured with an attached thermocouple. A parametric relationship which correlates variable wall temperature sphere drag data in the hypersonic near free molecule regime is introduced. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 380
Get Book Here
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Harry Ashkenas
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 13
Get Book Here
Book Description
Author: Gerald R. Karr
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 156
Get Book Here
Book Description
Author: John Altnow Dutton
Publisher:
ISBN:
Category : Atmospheric turbulence
Languages : en
Pages : 1164
Get Book Here
Book Description
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: 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 : 648
Get Book Here
Book Description
