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Fluid undercutting in the successive channel flow of two gases.A fluid piston technique wherein one gas displaces another gas from a horizontal channel was investigated experimentally in a laboratory simulation of the operating concept of a Mach number 9, true-energy wind tunnel. Tests were conducted over a Froude number range from 0.0015 to 0.543 at driver-to-driven gas density ratios from 0.637 to 11.0 to find the effect of fluid undercutting (or overcutting) on test duration. Other variables studied, either experimentally or analytically, include channel cross-sectional shape, channel inlet design, channel length-to-diameter ratio, Reynolds number, pretest pressurization, and channel inclination angle. Results from shadowgraph movies and pressure measurements provide a correlation of actual-to-ideal test durations for a wide range of Froude numbers and gas density ratios and indicate that the application of the fluid piston technique to the wind-tunnel concept is feasible. However, severe fluid undercutting (or overcutting) in horizontal channels occurs at lower Froude numbers and at density ratios significantly different from unity.
Document ID
19730032142
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Guy, R. W.
Jenkins, R. V.
(NASA Langley Research Center Hampton, Va., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Subject Category
Fluid Mechanics
Report/Patent Number
AIAA PAPER 73-214
Meeting Information
Meeting: Aerospace Sciences Meeting
Location: Washington, DC
Start Date: January 10, 1973
End Date: January 12, 1973
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
73A16944
Distribution Limits
Public
Copyright
Other

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