d wetted surface area of 2000 sted in the laboratory at a ve drag on the model is 50 N. De Wave resistance drag of the m
d wetted surface area of 2000 sted in the laboratory at a ve drag on the model is 50 N. De Wave resistance drag of the m
Sustainable Energy
2nd Edition
ISBN:9781337551663
Author:DUNLAP, Richard A.
Publisher:DUNLAP, Richard A.
Chapter12: Wave Energy
Section: Chapter Questions
Problem 10P
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Transcribed Image Text:Q.56 It is proposed to design a ship. The proposed ship (prototype) is has a length of 150
m and wetted surface area of 2000 m² with a speed of 40 km/hr. A model of 1:20 is to
be tested in the laboratory at a velocity corresponding to the wave resistance. The
total drag on the model is 50 N. Determine the following
(1) Wave resistance drag of the model.
(ii) Wave resistance drag of prototype.
(iii) Friction drag on prototype.
1
Given friction drag, F, ==C PAV², C
H
0.01
Rec.2
for Re> 2 x 10'
0.074
Re
Pmode=1000 kg/m³, p.
= 1020 kg/m³,
prototype
v₂ = 1.125 x 10 m/sec, v = 1.11 × 10 m/sec.
P
for R <2 x 10¹,
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