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3. Assume that the drag coefficient Ca = Fa/(1/2)pU? A becomes independent for Re > 10%. We expect that a car will be dr
Posted: Fri Mar 04, 2022 10:09 am
by answerhappygod
- 3 Assume That The Drag Coefficient Ca Fa 1 2 Pu A Becomes Independent For Re 10 We Expect That A Car Will Be Dr 1 (34.32 KiB) Viewed 32 times
3. Assume that the drag coefficient Ca = Fa/(1/2)pU? A becomes independent for Re > 10%. We expect that a car will be driven at an average speed of 100 km/h in a highway. (a) Based on the Reynolds number similarity, what should be the speed of airflow around a model car that is 10 times smaller than the actual (prototype) car? To what value of the speed of sound must be controlled, if the model testing were done at Mach number Ma<0.3. (b) You are given that the length of the model car is im = 0.1 m and the measured drag for the model car is F = 1.2 N (here, superscript/subscript" stands for model). The experiment was done for a projected area of A = 77. Based on the given data, calculate the drag force exerted on the actual car when driven at 100 km/h.