船舶推进系统propulsion_systems

SHIP HYDRODYNAMICS LECTURE NOTES OF

PROPULSION PART

Course Outline

Week

Date

Contents Time

1. Propulsion Systems

a)History and Development of Screw Propeller

b)Modern Propulsion Systems

i-Fixed pitch propellers

ii-Ducted propellers

iii-Contra-rotating propellers

iv-Overlapping propellers

v-Controllable pitch propellers

1 hour 19.11.2004 8th

vi-Waterjet propulsion system

vii-Cyclodial propellers

viii-Paddle wheels

ix-Superconducting electric propulsion

system

x-Azimuth podded propulsion system

2. Propeller Geometry

a)Frames of Reference

b)Propeller Reference Lines

c)Pitch

d)Rake and Skew

1 hour 19.11.2004 8th

e)Propeller Outlines and Areas

f)Blade Sections (NACA Definition of Thickness and

Camber)

g)Propeller Drawing

2 hours 23.11.2004 9th

Example (Wageningen series offset)

3. Hydrodynamic Characteristics of Propellers

a)Open Water Characteristics

b)Propeller-Hull Interaction-Wake

i-Wake field characteristics

ii-Wake field definition (nominal wake field,

effective wake field)

2 hours 26.11.2004 9th

iii-Thrust deduction

iv-Relative-rotative efficiency

v-Propulsive efficiency and propulsion

factors

vi-Summary of efficiencies in powering

c)Standard Series Propeller Data

4. Basic Outlines of Propeller Design

2 hours 30.11.2004 10th

Example (Propeller Design - Stage 1)

5. Propeller Theories

a)Momentum Theory

b)Blade Element Theory

2 hours 03.12.2004 10th

Example (K T, K Q, η0 and B p-δ)

Contents Time Date Week Mid-Term Exam 2 hours 7.12.2004 11th

c)Profile Characteristics

d)Profile Series

e)Lifting Line Theory

2 hours 10.12.2004 11th

f)Lifting Surface Theory

g)Boundary Element Methods

6. Cavitation

a)The basics of cavitation

i-Physics of cavitation

ii-Historical development

iii-Cavitation number (inception)

iv-Effect of angle of attack on cavitation

b)Types of cavitation experienced by propellers

i-Location on a blade

ii-Physical appearance of cavitation

c)Effects of Cavitation on Propellers

2 hours 14.12.2004 12th

i-Performance breakdown

ii-Noise

iii-Vibration

iv-Erosion

d)Cavitation Considerations in Design

i-Cavitation criteria

ii-Cavitation bucket diagrams

d)Preventing Cavitation

Example (NACA pressure distribution, KT-KQ- RÖ) 1 hour? 17.12.2004 12th

7. Propeller Design

a)Propeller Design Basis

1. Resistance and power estimation

b)The use of Standard Series Data in Design

2. Determination of optimum RPM and propeller size

(diameter) (general case)

2 hours 21.12.2004 13th

3. Engine Selection

4. Prediction of performance in service

5. Determination of blade surface area (BAR) and cavitation

control

Example (Propeller Design - Stage 2+3, Cavitation Criteria) 2 hours 24.12.2004 13th

8. Propeller Tests

a)Open Water Tests

b)Self Propulsion Tests

2 hours 28.12.2004 14th

c)Cavitation Tests

d)Other Tests

Example (Self propulsion tests)

2 hours 31.12.2004 14th

Lab visit