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By Morton Gertler
This publication provides the result of the reanalysis of the Taylor average sequence facts, given in a kind which employs a very non-dimensional illustration. the key geometrical parameters used are beam-draft ratio, longitudinal prismatic coefficient, volumetric coefficient, and wetted-surface coefficient, the latter being redefinitions of Taylor’s displacement-length ratio and wetted-surface coefficient. The faired resistance facts is given as curves of residual-resistance coefficient as opposed to Froude quantity. The Schoenherr frictional-resistance coefficient is a functionality of Reynolds quantity, in order that repayment for modifications in basin water temperature might be made by utilizing the fitting kinematic viscosity within the computation of Reynolds quantity.
The scope of the sequence has been enlarged to incorporate a 3rd beam-draft ratio of 3.00 as well as the beam-draft ratios of 2.25 and 3.75 released in Taylor’s “Speed and gear of Ships”. those values have been received by means of interpolation, utilizing the transformed facts for the hitherto unpublished sequence 20 which had a beam-draft ratio of 2.92.
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Reanalysis of the Original Test Data for the Taylor Standard Series: U.S. Navy Department
This booklet provides the result of the reanalysis of the Taylor regular sequence information, given in a sort which employs a totally non-dimensional illustration. the foremost geometrical parameters used are beam-draft ratio, longitudinal prismatic coefficient, volumetric coefficient, and wetted-surface coefficient, the latter being redefinitions of Taylor’s displacement-length ratio and wetted-surface coefficient.
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Example text
6 The procedure is a s follows: The total-resistance is the speed, i s the waterline length, and is the kinematic viscosity w . 70 . 799! 51! 583! 623! 664! 661! 692! 49! 51 1 . 75 (Series21) 21) be cons ider ed , although it is p r e s e n t l y believed that such d i s c r e p a n c i e s would be small. if the t e m p e r a t u r e c o r r e c t i o n s w e r e neglected, a n a t t e m p t t o c r o s s - f a i r the r el a t i v e l y small r e m a i n i n g r e s i d u a l r e s i s t a n c e would become complicated and l a r g e d i s t o r t i o n s might r e s u l t .
68 and l e s s than 3 p e r c e n t beyond this range. At the lower speed-length r a t i o s , since the C , is such a small percentage of the t o t a l - r e s i s t a n c e coefficient i n all c a s e s , it is believed that through the combination of the c o r r e c t i o n s applied and the c r o s s - f a i r i n g , v e r y good s t a n d a r d s of a c c u r a c y have been maintained. 92 used on the original models. This was done to provide a n even value f o r interpolation purposes in the final p r e s e ntati on.
Curve s e t C is used to convert the speed-length r a t i o f r o m the r e s t r i c t e d to u n r e s t r i c t e d values. It may be noted that curve C is a single curve in the range of values required for the r e s t r i c t e d channel corrections for the Taylor S e r i e s . CROSS-FAIRING O F RESISTANCE DATA After the r e s i d u a l - r e s i s t a n c e coefficient v e r s u s speedlength r a t i o c u r v e s were initially f a i r e d and the c o r r e c t i o n s for transitional flow and r e s t r i c t e d channel effect applied, it remained 'to c r o s s - f a i r the C r against the geometrical p a r a m e t e r s C p , C w and B / H .