13) There is an opitmal ground clearance for a venture-style difuser to produce

Question

13) There is an opitmal ground clearance for a venture-style difuser to produce downforce for a race car. Explain physically, what happens when ground clearence is too small? also, what happens when the ground clearance is too large?

14) Define favorable pressure gradient? also, why is it called Favorable?

15) the formula car that weas parked at xxxx recently had an aerodynamic s element much like the one shown in red circle. What is this device and what its purpose?

13)There is an optimal ground clearance for a venture-tyledinusert prodace downforce for a car, is too smaln Also, what happens when thegousd cloemaris 15 The

Explanation / Answer

13. - When the ground clearance is too small, it results in very less amount of air flow through the diffuser. As a result there will be positive lift created, which means instead of the required downforce which improves stability of the car, a countering upward force will act on it. Thus stability of the car will get affected. When the ground clearance is too large, the cross sectional area will not significantly reduce from inlet to exit. Consequently the air flow will not get the required acceleration and hence the downforce required.

14. - Favorable pressure gradient - A pressure gradient wherein pressure decreases in the direction of flow is known as favorable pressure gradient. Such a negative pressure gradient in the direction of flow is called favorable as it will reduce the drag on the aerodynamic body (e.g. an aeroplane wing) to reduce, move the point of boundary layer separation further downstream or when large enough, remove the separation. It will improve the lift on the body. Thus overall a negative pressure gradient, called favorable pressure gradient will help to improve aerodynamic stability of the body.

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