Emerson Cavitation Tunnel
A specialist flume for hydrodynamic research of propellers, turbines, foils, bluff bodies, coatings and innovations. The test section is 3.1 metres long and has an adjustable working cross section of 1.2 x 0.8 metres. Atmospheric pressure within the tunnel can be adjusted to enable analysis and visualisation of cavitating flow. We keep an extensive range of instrumentation for the analysis of cavitation, propeller/turbine performance, underwater radiated noise, surface pressures, flow velocity (including LDA and PIV lasers), flow visualisation (including stereoscopic PIV and high-speed video), boundary layer formation and coating drag
Vertical Plane, Closed Circulating Specifications
|Maximum velocity||20 knots (10m/s) with insert (0.81mx0.81m)|
|Absolute pressure range||7.6 kN/m2 (min) to 106 kN/m2 (max)|
|Cavitation number range||0.5 (min) to 2 (without insert)|
|Model propeller size||150mm to 400mm|
|Size||3.10 x 1.22 x 0.81m (LxBxH)|
|Area||0.99m2 (0.64m2 with insert)|
The drive system is a 4 bladed axial flow impeller with thruster control drive system.
|Main pump power||300Kw|
|Main pump rotational speed||292rpm|
Type 1 - Kempf & Remmers H33 propeller dynamometer
|Max thrust||± 2943 N|
|Max torque||± 147 Nm|
|Max rpm||4000 rpm|
Type 2 - Kempf & Remmers R45 with vertical adjustable drive system
Suitable for placement inside of hull models.
|Max thrust||± 687 N|
|Max torque||39 Nm|
|Max rpm||4000 rpm|
Bruel & Kjaer 8103 miniature hydrophone and associated instruments.
In a water filled, thick walled steel cylinder placed on a 30mm Perspex window above propeller.
Conventional and unconventional propeller performance tests, including shaft inclination in three axes.
Boundary layer and drag tests with flat planes, submersible bodies and propellers with coating.
Propeller testing in simulated ice blocks.
The Tunnel can be used to test wake simulation using:
- wake screens
- flat plate pressure pulse measurements
- a dummy hull model (including hull surface pressure measurements)
Cavitation and noise tests
Cavitation and noise tests can be conducted in uniform and non-uniform streams, and tidal/current turbine performance can be studied.
Measurement and recording
Flow can be measured and analysed using 3D LDA/PDA and stereoscopic PIV systems.
Load can be measured with submerged bodies.
The nature and extent of cavitation can be recorded using still and high-speed video cameras.