(a) Describe and compare bluff body and skin friction drag. How does the dominant form of...
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(a) Describe and compare bluff body and skin friction drag. How does the dominant form of drag influence the choice of characteristic length when forming dimensionless groups (drag coefficient, Reynolds number)? (b) A 1:20 scale streamline F1 car is placed in a wind tunnel to predict the drag force and downforce of a full-scale prototype. The projected frontal area of the model F1 car measures 10 cm x 5 cm; the model has a surface area of 3 x 10-4m² and is 25cm long. Using Buckingham Pi theory, where necessary, establish the relevant dimensionless groups to relate the scale experiment measurements to the prototype performance. (c) At what speed should the wind tunnel be set to predict the drag force of the full-scale prototype when travelling at 120 km/h? (d) If the downforce on the scale model, when the wind tunnel operates at 10 km/h is to be x N; what is the equivalent downforce expected on the full- scale prototype, when driven at 120 km/h? (Vair 15.06 x 10-6 m²/s; Pair = = 1.225 kg/m³) (a) Describe and compare bluff body and skin friction drag. How does the dominant form of drag influence the choice of characteristic length when forming dimensionless groups (drag coefficient, Reynolds number)? (b) A 1:20 scale streamline F1 car is placed in a wind tunnel to predict the drag force and downforce of a full-scale prototype. The projected frontal area of the model F1 car measures 10 cm x 5 cm; the model has a surface area of 3 x 10-4m² and is 25cm long. Using Buckingham Pi theory, where necessary, establish the relevant dimensionless groups to relate the scale experiment measurements to the prototype performance. (c) At what speed should the wind tunnel be set to predict the drag force of the full-scale prototype when travelling at 120 km/h? (d) If the downforce on the scale model, when the wind tunnel operates at 10 km/h is to be x N; what is the equivalent downforce expected on the full- scale prototype, when driven at 120 km/h? (Vair 15.06 x 10-6 m²/s; Pair = = 1.225 kg/m³)
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Solution a Bluff body drag and skin friction drag are two types of drag that affect the performance of objects in fluid environments Bluff body drag refers to the drag caused by the shape of an object ... View the full answer
Related Book For
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn
Posted Date:
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