An experimental study on the characteristics of wind-driven surface water film flows by using a multi-transducer ultrasonic pulse-echo technique
An experimental study was conducted to investigate the characteristics of surface water film flows driven by boundary layer winds over a test plate in order to elucidate the underlying physics pertinent to dynamic water runback processes over ice accreting surfaces of aircraft wings. A multi-transdu...
Gespeichert in:
Veröffentlicht in: | Physics of fluids (1994) 2017-01, Vol.29 (1) |
---|---|
Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | An experimental study was conducted to investigate the characteristics of surface water film
flows driven by boundary layer winds over a test plate in order to
elucidate the underlying physics pertinent to dynamic water runback processes
over ice accreting
surfaces of aircraft wings. A multi-transducer ultrasonic pulse-echo (MTUPE) technique was developed and
applied to achieve non-intrusive measurements of water film thickness as a function of time and space
to quantify the transient behaviors of wind-driven surface water film
flows. The effects of key controlling parameters, including freestream
velocity of the
airflow and flow rate of the water film, on the dynamics of the surface water runback process
were examined in great details based on the quantitative MTUPE measurements. While the
thickness of the wind-driven surface water film was found to decrease rapidly with the increasing
airflow velocity,
various surface
wave structures were also found to be generated at the air/water
interface as the
surface water
runs back. The evolution of the surface wave structures, in the terms of wave shape, frequency and
propagation velocity of the surface waves, and instability modes (i.e., well-organized 2-D waves vs. 3-D
complex irregular waves), was found to change significantly as the airflow velocity increases. Such
temporally synchronized and spatially resolved measurements are believed to be very helpful to elucidate
the underlying physics for improved understanding of the dynamics of water runback process
pertinent to aircraft icing phenomena. |
---|---|
ISSN: | 1070-6631 1089-7666 |
DOI: | 10.1063/1.4973398 |