The Use of Interferometry as an Aid to Studying Flapper-Valve Flow Characteristics
- 1 October 1976
- journal article
- Published by SAGE Publications in Journal of Mechanical Engineering Science
- Vol. 18 (5) , 229-233
- https://doi.org/10.1243/jmes_jour_1976_018_037_02
Abstract
A technique is described for visualizing the air flow over a surface by means of an oil film. The technique is used in conjunction with experimentally determined flapper-plate pressure profiles to examine the flow characteristics of a flapper-nozzle valve used to control air at 425 kPa (4.25 bar). The oil film shows clearly the points of separation and reattachment of the air boundary layer resulting from shock wave and boundary layer interaction. Possible applications of the technique are discussed and attention is focused on the use of the oil-film technique in conjunction with interferometry as a tool for the rapid determination of the effects caused by changes in nozzle geometry.Keywords
This publication has 2 references indexed in Scilit:
- A study of the motion of oil films on surfaces in air flow, with application to the measurement of skin frictionJournal of Physics E: Scientific Instruments, 1976
- An experimental investigation of the interaction between shock waves and boundary layersProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1954