The measurement of sphere drag in a rarefied gas using a magnetic wind tunnel balance PDF Download
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Author: W. M. Phillips
Publisher:
ISBN:
Category :
Languages : en
Pages : 90
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Book Description
Author: W. M. Phillips
Publisher:
ISBN:
Category :
Languages : en
Pages : 90
Get Book Here
Book Description
Author: W. M. Phillips
Publisher:
ISBN:
Category :
Languages : en
Pages : 81
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Book Description
Drag measurements on spheres in high speed transition regime flow are presented. The spheres are suspended electromagnetically in the low density flow field from a jet expanding freely from a small sonic nozzle into a vacuum. This arrangement provides sting-free measurements under hypersonic conditions. The current in the control coil of the electromagnetic balance is proportional to the applied force and provides a sensitive determination of the small forces encountered. Data were taken using nitrogen and argon gases. A number of nozzle and sphere sizes were employed covering a Knudsen number range of 0.05 to 5. The results exhibit a smooth increase in the transition regime drag coefficient toward the free molecular limit for diffuse reflection and complete thermal accommodation. Comparison is made with the available experimental results of other techniques. Improved repeatability and an extension of range of flow parameters is obtained with the present methods. The data are compared with current near-free molecular flow theories and the modified Krook solution of Willis is found to give the best agreement with the experimental results. (Author).
Author: Jerome Aroesty
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 318
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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:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 296
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 892
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Author: K. R. Sivier
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 94
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Author: Marie H. Tuttle
Publisher:
ISBN:
Category : Magnetic balances
Languages : en
Pages : 52
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Author: Kenneth R. Sivier
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 84
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This report investigates wind tunnel drag measurements on subsonic sphere.
Author: Kenneth R. Sivier
Publisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 84
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This report investigates wind tunnel drag measurements on subsonic sphere.
Author: Pennsylvania State University
Publisher:
ISBN:
Category :
Languages : en
Pages : 252
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