Enhancing Tyre Grip with High-Pressure Air Jets

  • Thread starter Thread starter kurious
  • Start date Start date
  • Tags Tags
    Air Jets
Click For Summary

Discussion Overview

The discussion revolves around the potential enhancement of tyre grip through the use of high-pressure air jets directed into the grooves of tyres. Participants explore various theoretical implications, practical applications, and the mechanics involved in this concept, including considerations of pressure dynamics and airflow behavior.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether high-speed jets of air would reduce pressure in the grooves and enhance grip or increase pressure and decrease grip.
  • Another participant suggests that the effect could be similar to a Venturi pipe, potentially increasing grip, but expresses doubts about its industrial applications.
  • A different viewpoint argues that using a high-pressure source to create the air jet would likely result in a net loss of traction due to increased pressure, despite the small surface area involved.
  • Concerns are raised about the turbulence created by air displacement and its impact on laminar flow at the tread depth level.
  • One participant proposes channeling atmospheric air through the bodywork to achieve low-pressure air at the bottom of the tyres, but questions the effectiveness due to small surface area and turbulence issues.
  • Another idea is presented about using a jet of air to force water out from under a tyre in poor road conditions, which could potentially improve grip.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the effectiveness and practicality of using high-pressure air jets to enhance tyre grip, with no consensus reached on the validity of the proposed methods.

Contextual Notes

Participants highlight limitations such as the small surface area of the tyre contact patch and the potential for turbulence affecting airflow dynamics, which remain unresolved in the discussion.

kurious
Messages
633
Reaction score
0
If tyres are deeply grooved and a high speed jet of air was deliberately sprayed into the grooves , could this enhance the grip via pressure reduction
or does it result in an increase in pressure and decrease in grip?
 
Engineering news on Phys.org
I think it would create same effect the Venturi pipe. So that the grip would be increased. But:
-I have doubts about its industrial applications.
-F1 cars have a Venturi pipe at its bottom. This is called the "ground effect". It enhances a better structural grip to the floor and counteracts lifting.
 
Well, if you created the high speed jet of air by 'spraying' it onto the tires, that implies you're using a high pressure source. Since you end up with a still higher pressure than atmospheric you lose traction, albeit a small amount since the surface area is small.

If it were simply the displacement of the air by the tire the amount of turbulence is going to be quite large so any laminar flow of air discussion at the level of tread depth is likely a waste of time. And again, this is especially true when a adequate surface area is needed for a pressure drop to become effective like the size of the wing on an aircraft.

Cliff
 
What about channeling atmospheric air through the bodywork on to the bottom of the tyres? Could get low pressure air that way.
 
kurious said:
What about channeling atmospheric air through the bodywork on to the bottom of the tyres? Could get low pressure air that way.

You still have two problems:

1. Small surface area. This is like saying you can generate downforce on your car when you stick your hand out the window and make your fingers flat and pitch it at say a 45 degree angle. Sure you can feel the wind's effect on your hands, but it that going to change the tire's loading enough to measure it? What if it was just a business card? How big is a tire's contact patch (not very big, 20 sq in) and then how much of that contact patch would the grooves occupy, maybe 15%?

2. Turbulence. Think of an aircraft wing pitched with an attitude too steep where it goes into stall.

Cliff
 
What if a jet of air was used to force water from under a tyre when road conditions are bad? That could help improve grip.
 

Similar threads

  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 6 ·
Replies
6
Views
8K
Replies
18
Views
3K
Replies
5
Views
3K
  • · Replies 3 ·
Replies
3
Views
7K
  • · Replies 15 ·
Replies
15
Views
5K
  • · Replies 10 ·
Replies
10
Views
4K
  • · Replies 26 ·
Replies
26
Views
9K
Replies
13
Views
4K