## Preface

This volume is intended for engineering students in introductory aerodynamics

courses and as a reference useful for reviewing foundational topics for graduate

courses.

The sequence of subject development in this edition begins with definitions and

concepts and then moves on to incompressible flow, low speed airfoil and wing

theories, compressible flow, high speed wing theories, viscous flow, boundary layers,

transition and turbulence, wing design, and concludes with propellers and propulsion.

Reinforcing or teaching first the units, dimensions, and properties of the physical

quantities used in aerodynamics addresses concepts that are perhaps both the simplest

and the most critical. Common aeronautical definitions are covered before lessons

on the aerodynamic forces involved and how the forces drive our definitions of airfoil

characteristics. The fundamental fluid dynamics required for the development of

aerodynamic studies and the analysis of flows within and around solid boundaries for

air at subsonic speeds is explored in depth in the next two chapters. Classical airfoil

and wing theories for the estimation of aerodynamic characteristics in these regimes

are then developed.

Attention is then turned to the aerodynamics of high speed air flows in Chapters 6

and 7. The laws governing the behavior of the physical properties of air are applied

to the transonic and supersonic flow speeds and the aerodynamics of the abrupt

changes in the flow characteristics at these speeds, shock waves, are explained.

Then compressible flow theories are applied to explain the significant effects on

wings in transonic and supersonic flight and to develop appropriate aerodynamic

characteristics. Viscosity is a key physical quantity of air and its significance in aerodynamic

situations is next considered in depth. The powerful concept of the boundary

layer and the development of properties of various flows when adjacent to solid

boundaries create a body of reliable methods for estimating the fluid forces due to

viscosity. In aerodynamics, these forces are notably skin friction and profile drag.

Chapters on wing design and flow control, and propellers and propulsion, respectively,

bring together disparate aspects of the previous chapters as appropriate. This

permits discussion of some practical and individual applications of aerodynamics.

Obviously aerodynamic design today relies extensively on computational methods.

This is reflected in part in this volume by the introduction, where appropriate, of

descriptions and discussions of relevant computational techniques. However, this text

is aimed at providing the fundamental fluid dynamics or aerodynamics background

necessary for students to move successfully into a dedicated course on computation

methods or experimental methods. As such, experience in computational techniques

or experimental techniques are not required for a complete understanding of the aerodynamics

in this book. The authors urge students onward to such advanced courses

and exciting careers in aerodynamics.