Systematic Approach to Develop an Optimized Nozzle Design for … · 2017. 10. 19. · DYNAMIC...

DYNAMIC POSITIONING CONFERENCEOCTOBER 9‐11, 2017

THRUSTERS

Systematic Approach to Develop an Optimized Nozzle Design for Up to Date and Future Demands

Jan Glas, Klau Tweddel, Lutz MüllerSchottel

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SYSTEMATIC APPROACH TO DEVELOP AN OPTIMIZED NOZZLE DESIGN FOR UP TO DATE AND FUTURE DEMANDS

Müller, Tweddell, Glas 10.10.2017


Content

01 Introduction

02 Nozzle Optimization

Optimization Technique / Approach

Market Study / Predesign

Parameterization

Design Process / Tools

Model Tests

03 Results

04 Integrated Anode Concept


01 Introduction>> Background

Principal use:

Nozzle used to increase thrust at low speed operation

nozzle profile

Performance:

highly dependant on nozzle profile


01 Introduction>>Application Requirements

DP-Performance (~0-2kn) Towing (~3-6kn)

BP-Performance (0kn)

Free-Sailing (~10-12kn)

Shipspeed

Free-Sailing+ (>12kn)

Bollard-Pull DP-Operation

Towing

Free-Sailing +Free-Sailing


01 Introduction>> New Development >>Objectives

New development, design objective:


01 Introduction>> New Development >>Objectives

Requirements for the new compromise duct:

suitable for a wide range of various applications

improved free running performance (fuel economy)

minimized space for installation

identical bollard pull as standard nozzle WAG19A-mod

?…which nozzle design???


Content

01 Introduction




Parameterization


Model Tests

03 Results



02 Nozzle Optimization>> Optimization Technique

Optimization TechniqueTraditional:Modeltest, Experiments

Virtual Product Development: Computer Simulations,„Virtual Experiments“

Modeltest

Towing Tank


02 Nozzle Optimization>> Approach

Virtual Product Development:

Phase VIPhase III

Phase II: determine optimal nozzle design with computer simulationsPhase III: verify optimized performance in model testPhase VI: check full scale performance

Phase I: Suitable selection of nozzle geometries / parametriziation

Phase IIPhase I

Prototype modell testSimulationDesign Full scale testBenchmark

Parameterization

Market study


02 Nozzle Optimization>>Nozzle >>Market-analysis >>Results


02 Nozzle Optimization >> PreDesign Check >> PSV


02 Nozzle Optimization>> PreDesign Check - Model Based

Performance check

Based on thrust loadidendity

Assessment of efficiencyimprovement


02 Nozzle Optimization>> PHASE I


Phase VIPhase III



Phase IIPhase I


Parameterization

Market study


02 Nozzle Optimization>> Parametrization

Opening angle

Inflow contour

Radius Leading edge

Diffusor geoemetry


02 Optimization-Workflow>> Applied Tools

Geometry Update CFD Calculation

Optimizer

Optimization setup: Genetic algorithmInput variables: 5 parameters

Design objective: Maximize BP- & FR-performance


02 Optimization-Workflow>> Applied Tools


02 Nozzle Optimization>> Examined Designs

Examined Designs:

6

MaximizedBP- & FR-performance

Optimized Design:

Diffusor Optimization(79 designs)

Inflow Optimization(150 designs)

2. step:1. step:


02 Nozzle Optimization>> PHASE II


Phase VIPhase III



Phase IIPhase I


Parameterization

Market study


02 Nozzle Optimization>> Modeltest

SRP 510 with optimized nozzle

SVA-Potsdam

Towing Tank

Modeltests with the optimized nozzle:


Content

01 Introduction




Parameterization


Model Tests

03 Results



03 Results>> Performance >>Open Water Test

Low Speed Operation--- SDV45

--- WAG19A-mod

SDV45 „SCHOTTEL VarioDuct“increased performance proofed in Open Water Tests

Medium & higher Speed Operation

10KQ

KT

eta

… identical bollard pull

and increased freesailing efficiency


03 Results>> Performance >>Open Water Test

… identical bollard pull

SDV45 „SCHOTTEL VarioDuct“increased performance proofed in Open Water Tests

and increased free sailing efficiency

Offshore Supply Vessel(Free-running-design, SRP430 FP, 1600kW, DP=2.3m)

nozzle WAG19A-mod SDV45

DP-thrust (1kn) [t] 47.1 (100%) 48.5 (+3%)

max. vessel speed [kn] 14.8 (100%) 15.1 (+0.3kn)

power @ 14.8kn [kW] 1571 (100%) 1410 (-10.2%)


03 Results>> Nozzle >>Performance

1

2

3

4

5

6

7

8

9

10

Bollard Pull DP - Performance Towing Free Running(8-12 kn)

Free Running(>12 kn)

RAN

K

WAG 19aLow-Speed High-Speed

(0 kn) (0-2 kn)

initial nozzle optimized nozzle

(3-6 kn)


03 Results>> PHASE III


Phase VIPhase III



Phase IIPhase I


Parameterization

Market study


03 Results>> SDV45

Bollard Pull Test: Harbout Tug - Geta Coast Guard Speed Trial: Escort Tug - Dux


03 Results>> PHASE IV


Phase VIPhase III



Phase IIPhase I


Parameterization

Market study


03 Results>> SDV45SDV45 „SCHOTTEL VarioDuct“

…combines great bollard pull capacitieswith excellent free sailing efficiency

at minimized installation space


Content

01 Introduction




Parameterization


Model Tests

03 Results



04 Integrated Anode Concept>> Invention

The real life …

… a picture is worth a thousand words


04 Integrated Anode Concept>> Invention

The invention …

… a picture is worth a thousand words


04 Integrated Anode Concept>> Hydrodynamic Comparison >> OWC

-1.0-0.2 -0.2 0.0 0.0 0.0

-4.0

-2.7 -2.7 -1.7-1.1

-0.1 0.0

-2.0-1.3 -0.9 -0.7 -0.7

-16.8

-12.2

-5.1 -5.8

-3.8

-18

-16

-14

-12

-10

-8

-6

-4

-2

0

SRP150 (1.1m) SRP260 (1.75m ) SRP360 (2.2m) SRP460 (2.7m) SRP630 (3.2m) integrated (blank) blank nozzle

Effic

ienc

y lo

ss[%

](r

elat

ive

tobl

ank

nozz

le)

max speed

transit

best worstAnodelayout:

Reference


04 Integrated Anode Concept>> Advantages

• less thruster weight

• increased hydrodynamic efficiency:higher speed , less fuel consumption

• reduced risk of anode damage

• minimum installation space

• increased protection time: up to 5 years and more


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Systematic Approach to Develop an Optimized Nozzle Design for … · 2017. 10. 19. · DYNAMIC...

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