Accession Number:

ADA022383

Title:

Experiments on the Stability of Liquid Films Adjacent to Supersonic Boundary layers,

Descriptive Note:

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG COLL OF ENGINEERING

Report Date:

1976-02-01

Pagination or Media Count:

43.0

Abstract:

The stability of liquid films adjacent to supersonic streams was investigated experimentally and compared with analytical results. Linear theories predict that films adjacent to supersonic streams are much more unstable than those adjacent to subsonic streams. However, our supersonic experimental observations incidated that the liquid film was stable with no entrainment under all test conditions. These conditions included laminar and turbulent boundary layers, a variation in the liquid Reynolds number Based on flow rate from 1 to 200, and a variation in the liquid Reynolds number based on flow rate from 1 to 200, and a variation in the free-stream unit Reynolds number from 1600000m to 110,000,000m. These experimental observations can be explained by nonlinear theories which predicts that linear unstable disturbances do not grow indefinitely, but achieve steady-state amplitudes in the supersonic case. The different aspects of the observed wave behavior such as frequency, wavelength, and amplitude are discussed and compared with previous experimental observations and the nonlinear theories. Author

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE