Propeller design charts of AU-type propeller series of large area ratio

(1)

ARCHIEF

Introduction

\Vitli the increase of power anti/or speed of

mod-ern ships, it has become necessary to develop the

design diagrams of propellers of large blade area. Authors of this article intended to conduct a further systematic testing work with the AU-type four-, five-and six-bladed propeller models having a large area ratio.

In this article, the authors present results of the

open water tests and the /Bp_ type and handy

type design diagrams.

8.80

Fig. i b) General Plan

of Propeller Model (AU 5-80)

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By Msuo Yazoki

Shipbuilding Research Centre of Japan

Michio Takahashi Kobe Steel Ltd. 1 2.4d

lab.

v Scheepsbouwkud

Technische Hogesehool

Deift

Arec co

Model Propellers and Open Water Tests

Principal particulars of the model propellers used in open water tests are given in the table shown at the end of this article.

The general plan of model propellers is shown in

Figs. I a) , lb) and Ic) . Fig. I a) shows the plan of the four-bladed propellers of area ratio 0.70, which is

called as AU4 70 series. Fig. lb) shows the ))lafl

of the five-bladed propellers of area ratio 0.80, which is called as AU5-80 series. And, Fig. lc) shows the plan of the six-bladed propellers of area ratio 0.85, which is called as AUw 6-85.

13.60

Fig. i a) General Plan et Propeller Model (Ali 4-70)

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Dimensions Are Shown as Perces age of D.

July 1969 5

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Fig. 2 a) JK, KQ, Curves

(AU 4-70)

Fig. i C) General Plan of Propeller Model (AUw 6-85)

1.4 0 0. O. o-o. O 0.1 0.2 0.3 04 0 5 06 0.7 0.8 09 1 0 1.1 1.2 1.3 1 4 J Fig. 2 b) J.K, KQ, Curves (AU 5-80)

Japan Shipbuilding ¿- Marine Engineering

i'

AU 5-80 Constant Pitch

Exp. A. R.= 0.800 Boss Ratio 0.180 B.T.R.= 0.050 Rake Arngle= 100' Kr T/pn'O K. = Q/pC5 7KJ/2'TX J V /'D

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0.9 0.8 2 0.8 .; 0.7 Q-0.6 05 ; 0.8 0.7 Q-0.6 0.5 a,.. .

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4-ß?aded Propeller.Type ; AU Constant Pitch Exp. A. R. = 0.700 B. T. R.= 0.050 Boss Ratio= 0180 Rake Argle= 10 0

Fig. 3 a) %I;_ b' Type Design Diagram (AU 4-70)

f;_-8 Diagrars Exp. A. R. = 0.800 Boss Ratio= 0.180

Type ; AU 5- Bladed Propeller, Constant Pitch B. T. R. = 0.050 Rake Ang!e= 100

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D = Diameter n m. - -y

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6-Bladed Propeller, Type AUw, Corrstant Pitch Exp. A. R.= 0.850 Boos Ratio= 0.180

B. T. R.= 0.050 Rake Arrgle= 10 00

a _{P=DHPl1,.=75kg/SeC)}NRPM

Q = Diameter in m. V. =Advance Speed n lI.

Bx=!'_:_ NRPM

V.,-. _{P=DHPi PS}

_NO O = Diameter irr m.

--i;. V=Advonce Speed in kt.

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July 1969 ₇ Vr Advance Speed in Kt. 0.4 8 10 11 12 13 14 15

Fig. 3 b) \/Bp_ Type Design Diagr2m (AU 5-80)

3 4 5 6 7 8 9 io 12 13 14 15

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The open water tests were carried out in Mejiro No. 2 Experimcut Tank ac-cording to tue ordinary practice of Sl1i1)btiil(liilg Research Genti-e. To ob-tain the net thrust, the correction for the resistance

of the screw hub was applied for

the measured thrust at various SpCe(IS of advance.

1. i. 1. 0. 0.7 0.6 0.8 .8 0.7 LU ° _0.6 0.5 0.4

Fig. 4 a) Diagram for AU 4-70 (To Obtain Diameter of Optimum Propeller)

The Reynolds number Rn of the tests is shown in the table.

Test Results and Design Diagrams

Results of tests are shown in Figs. 2a) and 2b) -Tice .,/B7-ó type design diagrams obtained from

tue tests are shown in Figs. 3a) , b) and 3c) . In

these diagrams, the metric units are used, antI the density of sea water is assumed as 104.51 kg sec2/m4.

1,000 500 1.2 Li 0.9 0.7 0. 0.7 0.6 , 0.5 LU 0.4 0.3

Fig. 5 a) Diagram for AU 5-80

(To Obtain Diameter of Optimum Propeller)

90 100 1 0 120

Japan Shipbuilding & Marine Engineering

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Fig. 4 b) Diagram for AU 4-70 Fig. 5h) Diagram for AU 5.80

(To Obtain Pitch Ratio and Propeller Efficiency) (To Obtain Pitch Ratio and Propeller Efficiency)

CO 10.00 o-5.00 o. 30 40 50 60 70 80 90 1 00 - NO0 OC 30 40 50 60 70 80 ND0 8.0 7.0 E 6.0 5.0 E 4.0 E E 3.0 C 2.0 3 0,00 20.00 - 10,000 CO o-5,00 o o 1.000 500 200 30,00 20,00 8.0 7.0 E 6.0 5.0 C E 4.0 C .0 .0

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o-= 30.000 20,000 5,000 1,000 500

Fig. 6 a) Diagram for AUw 6-35 (To Obtain Diameter of Optimum Propeller)

The handy type design diagrams are prepared for

easy calculation of the principal dimensions and

efficiency of tise propeller, anti they are given in Figs. 4a) and -lb). Figs. 5a) and Sb), and Figs. 6a) and fib) . From these figures, we can easily obtain tise di-ameter. pitch ratio and propeller efficiency by using a

given delivered horsepower, and revolutions and advance speed of the propeller.

Reference

A. Yazaki and Others:

Open 'Water Test Series of Modified AU-Type Four- and Five-Bladed Propeller Models of Large Area Ratio, Papers of SRI, No. 28, 1968.

A. Yazaki anti Others :

Open Water Test

Series of Modified AUw-Type Six-Bladed Pro-peller Models of Area Ratio 0.85, Journ. of SNA of Japan, No. 125, 1969.

1.

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Principal Particulars of Model Propellers

60 70 80 NO, 90 100 1X0 120 -,-..

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8.0 o. 7.0 o-0. 6.0 E 0. 5.0 0. E 4.0 _C E _0. 3.0 o 0.5 2.0 L,J 0.4 0.3 AU4.70 0.250 0.180 0.70 0.7, 0.9, 0.308 0.050 1000e AUS-80 I AUw6-85 Diameter (m) Boss Ratio

Exp. Area Ratio Pitch Ratio

Max. Blade Width Ratio

Blade Thickness Ratio Angle of Rake 0.5, 1.1, Ii 0.4, 0.250 0.180 0.80 0.6, 0.8, 0.364 0.050 1000g 1.0, 1.2 0.5, 0.250 0.180 0.85 0,7, 0.9. 0.322 0.050 1000e 1.1 Number of Blades 4 5 6 Reynolds Number 5.1 X 105 6,5X105 5,6X105 CR =nD2/21 40 50

Fig. 6 b) Diagram for AUw 6-85 (To Obtain Pitch Ratio and Propeller Efficiency)

Nomenclature

Bp Power coefficient, Bp=NP°-5/ VA25

1) Diameter of propeller in meter

J: Advance coefficient, J=vA/nD

K0 Torque coefficient, KQ=Q/PU2D°

KT: Thrust coefficient, K= T/pn2D4

N Number of revolutions of propellers in RPM

n Number of revolutions of propellers in RPS

P Delivered horsepower in Ps

Q Torque in kg-m

T Thrust in kg

VA Advance speed of propellers in knots

VA Advance speed of propellers in rn/sec 6 Diameter coefficient, 6=ND/VA

p Density of water in kg sec2/m4

'lo Propeller efficiency in open water condition