Resistance, self-propulsion and wake survey tests of the Contract Design (Model OCRE911) of DND Joint Support Ship

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TypeTechnical Report
Series titleTechnical Report
Physical description66 p.
SubjectResistance; Self-Propulsion; Overload; Wake Survey; Flow Visualization; Propeller P106R; Model 911; Joint Support Ship
AbstractThis report describes experiments carried out on a 1:29.78 scale fully appended model of the Contract Design of the Joint Support Ship (JSS) in the Oceans, Coastal and River Engineering (OCRE) Towing Tank in June/July 2012. The purpose of these experiments was to evaluate performance of this revised design of the JSS in terms of its resistance, propulsion and wake survey characteristics. Revised design featured modifications to bulbous bow and stern region to correct deficiencies observed in the Preliminary Design of the JSS. Appended Resistance: Resistance coefficient is essentially the same as that of the preliminary design up to ten knots, is slightly higher (about 2%) at 10 knots and then becomes steadily less at all speeds above 10 knots. Maximum reduction in resistance coefficient is 12.5% and occurs at 20 knots (Froude number (Fr) = 0.244). Full scale effective power shows a similar trend. Propulsion: Propulsion tests showed that Contract Design represents an improvement over Preliminary Design in terms of Delivered Power (PD) and propeller revolutions. As was the case with Appended Resistance, there was little difference below 10 knots. Above 10 knots, PD for Contract Design versus Preliminary Design decreases steadily. The maximum percentage reduction in Delivered Power is 24% at 19 knots. Ship propulsion efficiency coefficients for this design confirm trends shown by the improvements in PD and propeller revolutions. Wake Survey: Wake Survey shows improved flow particularly into the upper portion of the propeller disk for the Contract Design when compared to the Preliminary Design
Publication date
PublisherNational Research Council Canada
AffiliationOcean, Coastal and River Engineering; National Research Council Canada
Peer reviewedNo
NPARC number21263766
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Record identifier327c813c-5dc9-4c49-aad8-de38ea7b04fc
Record created2013-03-16
Record modified2016-10-03
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