Race Car Aerodynamics: Designing for Speed - Joseph Katz

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Race Car Aerodynamics: Designing for Speed
Race Car Aerodynamics: Designing for Speed
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Item Description

In Race Car Aerodynamics, author Joseph Katz sumarizes the always-evolving field of high-speed vehicle design and aerodynamic development, a field in which he's been involved for close to two decades.

Spanning from Formula One to Indy Car; Dragsters to oval-track auto racing, the book will give you clear explanations on what makes a car go fast.

Useful information whether you're an engineer, an automotive designer, or just an enthusiast who wants to learn about what's involved when it comes to designing cars for speed.


Book Excerpt: Race Car Aerodynamics: Designing for Speed

AERODYNAMIC FORCES AND TERMS

BASIC TERMINOLOGY

Before embarking on a discussion about the aerodynamics of race cars or even of simple wings, I must explain some of the most basic terms in the professional jargon. I'll start with the observation that, due to a vehicle's forward motion, the otherwise still air is set into motion. In order to visualize this air motion, I must discuss the resulting airflow directions, the magnitude of velocity and pressure fields, and a few other basic terms.

These basics will establish the relation between airspeed and pressure. Understanding the pressure distribution over a vehicle's body is, of course, one of the primary objectives of this discussion, since the collective effect of the small differences in the pressure around the vehicle's body are responsible for aerodynamic loads such as lift and drag.

Some patience and dedication is needed for the next few sections because an initial "load" of definition is required before we can better relate to the new information and relate its significance to the main scope: the effect on vehicle performance.

STREAMLINES, ATTACHED AND SEPARATED FLOWS

Let us begin with one of the simplest definitions. It is related to the frequently shown smoke traces in the airflow near cars being tested in wind tunnels. These streamlines are the curves associated with a pictorial description of a fluid motion.

If our vehicle is moving forward at a steady speed, the flow is then called steady-state flow. In this case the air particles will move along the streamlines (lines which are parallel to the local velocity direction).

Fig. 2-1 demonstrates the shape of such streamlines as formed near an airfoil. Flow visualization of the streamlines can be obtained in a wind tunnel by injecting smoke or, in a water tunnel (which is usually used with smaller-scale models), by the injection of colored dye.

However, if the injected fluid has different density than the fluid, it may not follow the streamlines exactly. Therefore, the coloring material has to be selected very carefully, and in the case of automotive wind tunnel testing, the injection of smoke (which fairly close density to air) is widely used.


Subject: Transportation: Automotive: Car Racing: New directions in race car aerodynamics, designing for speed. ISBN-10: 0837601428 | ISBN-13: 9780837601427 | Bentley GAER

Specifications
  • Publisher: Bentley Publishers
  • Author: Joseph Katz
  • Pages: 308 - Over 250 photos and illustrations
  • Binding: Paperback - 8 x 10.25 inches
  • ISBN: 978-0-8376-0142-7
Table of Contents
TABLE of CONTENTS AERODYNAMICS AND RACE CARS
The impact of serodynamics on vehicle shape | Aerodynamic downforce and performance | Creating and measuring aerodynamic forces | How aerodynamics shapes race cars | The impact of racing aerodynamics on production cars | The following chapters AERODYNAMIC FORCES AND TERMS
Basic terminology | The boundary layer | Bernoulli's equation for pressure | Flow over bodies and the pressure coefficient | Drag, lift, and side force | Some relevant literature | References TOOLS OF THE TRADE
Road testing | Wind tunnel methods | Computational methods | References AIRFOILS AND WINGS
Airfoils: Basic definitions | Finite wings | Basic lifting surface interactions | Examples of various airfoil shapes | References AERODYNAMICS AND VEHICLE PERFORMANCE
Tire performance | Vehicle dynamics | Effect of aerodynamics on performance | Race car safety and aerodynamics | References AERODYNAMICS OF THE COMPLETE VEHICLE
Basic vehicle body concepts | Aerodynamics of the complete vehicle | Flow over wheels | Sliding seals and skirts | Underbody channels (venturis) | Simple add-ons: Spoilers, strakes, and wickers | Vortex generators | Louvers | Internal flow | Race car wings | References REAL-WORLD EXAMPLES
Milestones: Historically important designs | More current examples | References APPENDIXES
Drag Coefficients | Wind tunnels | Index | About the Author
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