56 / 94
56
Department of Energy and
Process Engineering
(Exchange student)
Spring 2017
Study of Vortex
Shedding from a
Vibrating Hydrofoil
Supervisor:
Ole Gunnar Dahlhaug
Mike Mui Bank Ting
MASTER THESIS
Background
The purpose of this master thesis is to measure
and analyse the pressure pulsations caused
by vortex shedding from a vibrating hydrofoil
at various water flow velocities. The hydrofoil
is installed in a blade cascade test rig. The
measurements are carried out on the hydrofoil
both with and without excitation. This will enable
the study of the effect of a vibrating hydrofoil on
the self-excitation frequencies of the hydrofoil
caused by the vortex shedding. The pressure
pulsations are measured at the wake of the
hydrofoil with quartz sensors.
This picture shows a cross-section of the test section in
the blade cascade test rig
The diagram to the left shows the pressure
pulsation frequency at various water flow
velocities