NASA Technical Reports Server (NTRS) 19930091338: The Measurement of Pressure Through Tubes in Pressure Distribution Tests
Book details
- Title
- NASA Technical Reports Server (NTRS) 19930091338: The Measurement of Pressure Through Tubes in Pressure Distribution Tests
- Publication year listed
- 1928
- Format
- Public domain eBook
- Reading access
- Free online reader; no registration required
- Source record
- View on Archive.org
About this book
NASA Technical Reports Server (NTRS) 19930091338: The Measurement of Pressure Through Tubes in Pressure Distribution Tests
Author: NASA Technical Reports Server (NTRS)
Year: 1928
The tests described in this report were made to determine the error caused by using small tubes to connect orifices on the surface of aircraft to central pressure capsules in making pressure distribution tests. Aluminum tubes of 3/16-inch inside diameter were used to determine this error. Lengths from 20 feet to 226 feet and pressures whose maxima varied from 2 inches to 140 inches of water were used. Single-pressure impulses for which the time of rise of pressure from zero to a maximum varied from 0.25 second to 3 seconds were investigated. The results show that the pressure recorded at the capsule on the far end of the tube lags behind the pressure at the orifice end and experiences also a change in magnitude. For the values used in these tests the time lag and pressure change vary principally with the time of rise of pressure from zero to a maximum and the tube length. Curves are constructed showing the time lag and pressure change. Empirical formulas are also given for computing the time lag. Analysis of pressure distribution tests made on airplanes in flight shows that the recorded pressures are slightly higher than the pressures at the orifice and that the time lag is negligi