-powered subma 7-39 A student rine for a design competition. The overall length of the proto- type submarine is 2.24 m, and its student designers hope that it can travel fully submerged through water at 0.520 m/s. The water is freshwater (a lake) at T = 15°C. The design team builds a one-eighth scale model to test in their university's wind tunnel (Fig. P7-39). A shield surrounds the drag bal-

-powered subma 7-39 A student rine for a design competition. The overall length of the proto- type submarine is 2.24 m, and its student designers hope that it can travel fully submerged through water at 0.520 m/s. The water is freshwater (a lake) at T = 15°C. The design team builds a one-eighth scale model to test in their university's wind tunnel (Fig. P7-39). A shield surrounds the drag bal-

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

proto-
7-39 A student team is to design a human-powered subma-
rine for a design competition. The overall length of the p
type submarine is 2.24 m, and its student designers hope that
it can travel fully submerged through water at 0.520 m/s. The
water is freshwater (a lake) at T = 15°C. The design team
builds a one-eighth scale model to test in their university's
wind tunnel (Fig. P7-39). A shield surrounds the drag bal-
V
Po, P
FLOUR
Wind tunnel test section
Model
Shield
E
FD
Drag balance
Strut

ance strut so that the aerodynamic drag of the strut itself does
not influence the measured drag. The air in the wind tunnel is
at 25°C and at one standard atmosphere pressure. At what air
speed do they need to run the wind tunnel in order to achieve
similarity? Answer: 57.0 m/s

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2. A student team is to design a human-powered submarine for a design competition. The overall length of the prototype submarine is 4.85 m, and its student designers hope that it can travel fully submerged through water at 0.440 m/s. The water is freshwater (a lake) at T = 15 °C. The design team builds a one-fifth scale model to test in their university's wind tunnel, as shown in the Fig. A shield surrounds the drag balance strut so that the aerodynamic drag of the strut itself does not influence the measured drag. The air in the wind tunnel is at 25 °C and at one standard atmosphere pressure. At what air speed do they need to run the wind tunnel in order to achieve similarity? Take for water at T = 15 °C and atmospheric pressure, p = 999.1 kg/m³ and µ = 1.138 × 10-³ Pa.s. Take for air at T = 25 °C and atmospheric pressure, p = 1.184 kg/m³ and µ = 1.849 × 105 Pa.s. Wind tunnel test section V Poo, P Model Shield FD Drag balance Strut