The Fourth International Symposium on Marine Propulsors 2015 – smp‘15

Propeller Characteristics in Oblique Flow

Case 1

Ulf Barkmann

Potsdam Model Basin (SVA)

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Open water test

PPTC

• Tests were conducted in

the towing tank of the SVA

• Dynamometer mounted

behind the propeller with

an inclination of 12°

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• The open water tests were carried out

according to the ITTC recommended

procedure 7.5-02-03-02.1 (2008) :

• Streamlined cap longer then 1.5 Df

• Cone with 20° opening angle

• Immersion of the propeller

center: 1.5 D

• Prior tests with cap and hub without

blades

• Hub of the same weight and shape

as the propeller hub with blades X

Y

Z

Open water test

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Open water characteristics - EFD

PPTC

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Reynolds number effects - EFD

PPTC

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Error estimation - EFD

PPTC

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Propeller accuracy

PPTC

Ongoing R&D project „Quality“

The influence of the production quality on the open water

characteristics shall be investigated

• Surface of propellers

are measured with a

photogrammetric

system

• Grids with 300.000

measurement points

were compared to

CAD

• Accuracy of 0.03 mm

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Propeller accuracy

PPTC

Pressure side Suction side

1

2

3

5

1

2

3

4

40µm -40µm 100µm -100µm

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Propeller accuracy

PPTC

Tolerance class Percentage

of area [%]

150 µm 4.8

100 µm 8.1

50 µm 58.9

-50 µm 26.8

-100 µm 0.6

-150 µm 0.9

0

10

20

30

40

50

60

70

-150 -100 -50 50 100 150

Pro

pel

ler

area

[%

]

Tolerance class [µm]

Median: 29.4 µm

Worst case estimation: 100 µm 1% KT, 10KQ

Propeller corresponds very well to the ITTC procedure

7.5-01-02-01 (2008)

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Error estimation II - EFD

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7

KT

x, 1

0K

Q, η

O [

-]

J [-]

PPTC - smp'15 Workshop

open water characteristics

measurement campaigns

1th quartile with propeller accuracy

3rd quartile with propeller accuracy

η0

KTX

10KQ

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Participants

PPTC

11 groups, 11 solvers, 16 calculations

Group Solver Acronym

ACCUSIM ANSYS-CFX ACCUSIM-CFX

OpenFOAM ACCUSIM-OF

CNRS-ECN ISIS CNRS-ISIS

CRADLE SCTetra steady CRADLE-SCTetra-st.

SCTetra unsteady CRADLE-SCTetra-unst.

CSSRC ANSYS-Fluent CSSRC-Fluent

ROTAM ANSYS-Fluent ROTAM-Fluent

MARIN ReFresco MARIN-ReFresco

TU Hamburg Harburg ANSYS-CFX TUHH-CFX

OpenFOAM TUHH-OF

panMARE TUHH-panMARE

University of Duisburg, Essen ISIS UDE-ISIS

University of Genoa BEM UniGenoa-BEM

StarCCM+ UniGenoa-StarCCM

University of Austin PROPCAV UTAustin-PROPCAV

VTT FinFlo VTT-FinFlo

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ACCUSIM CFX

PPTC

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ACCUSIM OpenFoam

PPTC

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CNRS ISIS (update)

PPTC

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CRADLE SCTetra (steady)

PPTC

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CRADLE SCTetra (unsteady)

PPTC

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CSSRC Fluent

PPTC

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MARIN ReFresco

PPTC

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ROTAM Fluent

PPTC

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TUHH CFX

PPTC

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TUHH OpenFoam

PPTC

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TUHH panMARE

PPTC

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University of Duisburg, Essen ISIS

PPTC

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University of Genoa BEM

PPTC

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University of Genoa Star-CCM+

PPTC

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University of Austin PROPCAV

PPTC

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VTT FinFlo

PPTC

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All characteristics - CFD

PPTC

minimum 1th quartile median 3rd quartile maximum

ηO 10KQ KTx

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CFD vs. EFD

PPTC

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Potsdam Propeller Test Case

PPTC

Thank You!