spindle torque
TRANSCRIPT
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An Experimental Study of Flow Around CPP Blade (3rd Report) Measurement of CPP Blade Spindle Torque
By Masamitsu ITO (Member), Shosaburo YAMASAKI (Member), Masamitsu OKU, Hajime KOIZUKA, Masahiro TAMASHIMA (Member)
,and Michihito OGURA (Member)
The hydrodynamical component of CPP blade spindle torque that plays an important role in CPP design, is investigated.
The hydrodynamical blade spindle torque of two model propellers (MP. B 82--1 and 82 2) was measured by the newly developed support-pillar type blade dynamometer in circulating water channels.
Measurements for two propellers in the uniform flow field indicated that the maximum value of hydrodynamical blade spindle torque occured at the maximum reverse pitch setting and near the bollard condition ( / = 0 ) and the dominant factor influenced on the hydrodynamical blade spindle torque was blade contour.
Fluctuations of the hydrodynamical, blade spindle torque of MP. B 82-1 in the simulated non-uniform flow field with the wire mesh were measured. Although means are much different, fluctuations were nearly same for the pitch setting angle from-10 to 10 degree. It is also seen that the means in the non-uniform flow fields were a little higher than the values in the uniform flow at the same operating condition (same thrust condition).
Comparisons of calculated values by the lifting surface method and measured values at the design and the maximum reverse pitch setting conditions were made and they showed good agreements. Then in order to use at the early design stage, spindle torque estimating charts of AU-CP series CPP were drawn based on the lifting surface calculations.
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Fig. 2 Section of propeller open boat
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SECTION A ~ A
Table 1 Calculated forces and moments
actuating on MP. B 82-1
Components
fx (Thrust)
Fy
F:2
Mx (Torque)
My
\-\z (Spindle ter qua)
Hydrodynamics!
Component
-148! 9
-63/ S
38 s
5146 g-cm
-12040 g-cm
1231 g-cm
Car.tr i ruga!
Component
-
51 3
1S43 9
-
-?? g-Cift
-4! 5 3-cm
Total
~\-\:6\ 9
-SSO 9
i SSI g
5146 g-cm
-12117 g-cm
8iS g-cra
:?ig. 4. Coordinate system-
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Fig. 5 DFB-12—Blade dynamometer for
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SIDE FORCE, Fs, kg
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Table 2 Plain par t iculars of model propellers
MP. NO.
Diameter (ful i s c a l e )
BHP (MCR)
N (MCR)
Kind of sh ip
Diameter (model)
Piich ( cons t . )
H/D ( c o n s t . )
Expanded a r ea r a t i o
Boss r a t i c
Blade t h i c k n e s s r a t i o
Mean b lade width r a t i o
Rake angi e
Number of b lade
D i r e c t i o n of t u r n i n g
Blade s e c t i o n
8 82-1
6650 mm
23@@@ ps
127 rpm
RO-RO cont .
249.34 mm
199. 51 mm
0. 3002
%. 6S33
0.2848
0.0541
@. 3363
0 .8
4
Right
MAU-M
B 8 2 - 2
9 0 0 0 mm
17000 p s
65 rpm
Bulk c a r r i e r
243. 44 mm
214.91 mra
§.8828
0.4000
0.2917
©.0440
0.2218
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4
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ADVANCE RATIO, J=v /nD
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calculated hydrodynamical blade
spindle torque
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mmmmm^m, » i 9 o § , HSSS. 9, p . 91 3 ) Bossow, G. ! Untersuchungen uber das
hydrodynamische Flugelmoment an Schiffs-verstellpropellern, Schiff bauforschung, 1962
4 ) Powell, S.C. 1 Performance and blade torque of a series of controllable pitch propellers, Massachusetts Institute of Technology, June, 1962
5 ) Pronk, C. ; Blade spindle torque and off-design behaviour of controllable pitch propellers, Doctor's Thesis, Delft University of Technology, 1980
6 ) Blaurock, J, *. Propeller blade loading in non uniform flow, SNAME symposium Propeller 75, July 1975
7 ) Hawdon, L., Carlton, B. A. and Leathard, F. I. ! The analysis of controllable pitch propeller characteristics at off design conditions, Trans, of Inst, of Mar. Eng., Vol. 88, 1976, p. 162
8 ) Boswell, R.J., Nelka, J . J . and Kader, R.D. : Experimental spindle torque and open water performance of two skewed controllable pitch propellers, DWTNSRDC Report No. 453, Dec. 1975.
9) ibiSXHjip: * S I £ f ^ n ^ y SbiM^IWil
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P. 20 15) Yazaki, A. [Model tests on four bladed
13) dlllff JEHSb H IE* , bbjliib*, S b t l l ^ , controllable pitch propellers, Report of
fePTtblit^b J l S f i ^ , mWiMM : Highly Ship Research Institute, No. 1, 1964
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