Aerodynamics for Engineering Students Sixth Edition E.L. Houghton

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Aerodynamics for Engineering Students Sixth Edition E.L. Houghton

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.