A model was tested of a tractor-trailer rig is performed in a wind tunnel. The drag force, FD, is found to depend on frontal area, A, wind speed, V, air density, r, and air viscosity, µ. The model scale is 1:4; frontal area of the model is 0.625 m^2. Obtain a set of dimensionless parameters suitable to characterize the model test results. State the conditions required to obtain dynamic similarity between model and prototype flows. When tested at wind speed V = 89.6 m/s, in standard air, the measured drag force on the model was FD = 2.46 kN. Estimate the aerodynamic drag force on the full-scale vehicle at V = 22 m/s. Calculate the power needed to overcome this drag force if there is no wind.
A model was tested of a tractor-trailer rig is performed in a wind tunnel. The drag force, FD, is found to depend on frontal area, A, wind speed, V, air density, r, and air viscosity, µ. The model scale is 1:4; frontal area of the model is 0.625 m^2. Obtain a set of dimensionless parameters suitable to characterize the model test results. State the conditions required to obtain dynamic similarity between model and prototype flows. When tested at wind speed V = 89.6 m/s, in standard air, the measured drag force on the model was FD = 2.46 kN. Estimate the aerodynamic drag force on the full-scale vehicle at V = 22 m/s. Calculate the power needed to overcome this drag force if there is no wind.
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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A model was tested of a tractor-trailer rig is performed in a wind tunnel. The drag force, FD, is
found to depend on frontal area, A, wind speed, V, air density, r, and air viscosity, µ. The model
scale is 1:4; frontal area of the model is 0.625 m^2. Obtain a set of dimensionless parameters suitable to characterize the model test results. State the conditions required to obtain dynamic similarity between model and prototype flows. When tested at wind speed V = 89.6 m/s, in standard air, the measured drag force on the model was FD = 2.46 kN. Estimate the aerodynamic drag force on the full-scale vehicle at V = 22 m/s. Calculate the power needed to overcome this drag force if there is no wind.
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