Effect of Mach Number on Position Error as Applied to a Pitot-static Tube Located 0.55 Chord Ahead of an Airplane Wing

Effect of Mach Number on Position Error as Applied to a Pitot-static Tube Located 0.55 Chord Ahead of an Airplane Wing
Author: W. F. Lindsey
Publisher:
Total Pages: 20
Release: 1944
Genre: Aerodynamics
ISBN:

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Summary: The effect on static-pressure measurements of locating a pitot-static tube 0.55 chord ahead of an airfoil section has been investigated. The tests were conducted in the NACA 24-inch high-speed tunnel on airfoil sections of various thickness ratios over a large range of Mach number. The results show that for a wing having a thickness ratio of 0.15 the measured Mach number, determined from a pitot-static-tube reading, is approximately 0.01 too low at a stream Mach number of 0.4 and approximately 0.03 too low at a Mach number of 0.8.

Wind-tunnel Tests of Seven Static-pressure Probes at Transonic Speeds

Wind-tunnel Tests of Seven Static-pressure Probes at Transonic Speeds
Author: Francis J. Capone
Publisher:
Total Pages: 36
Release: 1961
Genre:
ISBN:

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Wind-tunnel tests have been conducted to determine the errors of 3 seven static-pressure probes mounted very close to the nose of a body of revolution simulating a missile forebody. The tests were conducted at Mach numbers from 0.80 to 1.08 and at angles of attack from -1.7° to 8.4°. The test Reynolds number per foot varied from 3.35 x 106 to 4.05 x 106. For three 4-vane, gimbaled probes, the static-pressure errors remained constant throughout the test angle-of-attack range for all Mach numbers except 1.02. For two single-vane, self-rotating probes having two orifices at ±37.5° from the plane of symmetry on the lower surface of the probe body, the static-pressure error varied as much as 1.5 percent of free-stream static pressure through the test angle-of-attack range for all Mach numbers. For two fixed, cone-cylinder probes of short length and large diameter, the static-pressure error varied over the test angle-of-attack range at constant Mach numbers as much as 8 to 10 percent of free-stream static pressure.