Q.10. To predict the drag on an aircraft ata flight speed of 150 m/s, where thecondition of air is such that the local speedof sound is 310 m/s, a pressurized lowtemperature tunnel is used. Density,viscosity and local sonic velocity at tunnelcondition are 7.5 kg/m³, 1.22 x 10-5 Ns/m²and 290 m/s. Determine the flow velocityand the scale of the model. Assume fulldynamic similarity should be maintained.Density and viscosity at the operatingconditions are 1.2 kg/m³ and 1.8 x 105 Ns/m².2

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Engineering

Civil Engineering

peed of 150 fair is such tha 310 m/s, a C

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.

Question

Q.10. To predict the drag on an aircraft at
a flight speed of 150 m/s, where the
condition of air is such that the local speed
of sound is 310 m/s, a pressurized low
temperature tunnel is used. Density,
viscosity and local sonic velocity at tunnel
condition are 7.5 kg/m³, 1.22 x 10-5 Ns/m²
and 290 m/s. Determine the flow velocity
and the scale of the model. Assume full
dynamic similarity should be maintained.
Density and viscosity at the operating
conditions are 1.2 kg/m³ and 1.8 x 105 Ns/m².
2

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