First Edition

It is gratifying to note that in this book unified treatment and dimensional
analysis have been duly emphasized in the initial chapters of the book,
although its title projects specific types ofturbomachinery. Such a unified
treatment generally broadens the horizon and facilitates horizontal transfer
of knowledge and experience. Another significant aspect is the use of SI
units throughout the book. This should form a pace-setter for having all
other technical books with SI units.

After covering the essential aero-thermodynamic principles of turbomachinery, the author deals separately with a chapter on cascades which
have formed the basis for the optimum selection of aerodynamic geometry
of blades. This is a very welcome feature of the book. A subject oftopical
interest dealing. with “High Temperature Turbines” has been covered by
devoting to it a full chapter.

Although classical turbomachines continue to play a major role in the
energy sector, a class of machines called wind turbines are gaining
importance due to the renewable nature of wind energy. It is but
appropriate that the book closes with a chapter on wind energy and
turbines giving it a measure of completeness commensurate with the

The value of the book is enhanced by the numerous illustrations and a
balanced emphasis on various topics covered in the book. Principal
technical data of modem aviation gas turbines such as that for the
supersonic aircraft Concorde and RB-199, specifications of the turbine and
compressor blade profiles and some wind turbines form other
distinguishing features of the work. This book will be a valuable addition
to the existing books in turbomachinery which are primarily directed
towards the course work of students.

Moreover, the book introduces the
reader to the current research areas in turbomachinery. The author’s
extensive experience in teaching and research has been truly reflected in
this book. A detailed topic-wise bibliography containing over 800
references will be a valuable source of information for the researchers.

This book would be equally helpful to practising engineers who desire to
initiate themselves professionally in the field of turbomachinery.

Recent emphasis on energy problems has generated renewed interest in
turbines, compressors and fans. Steam and gas turbines develop the .bulk
of power required for land and air applications. Similarly, fans, blower~ and
compressors are some of the major power-absorbing machines in industry.
The wind turbine or windmill has reappeared on the power-generation
scene. Therefore, at this time a book wholly in SI units dealing with this
class of machines is badly needed by students, teachers and practising

The basic principle of working of these machines is the same-the
energy level of a continuously flowing fluid is changed by the action of a
rotating element, the rptor. The theoretical treatment of such machines
requires the knowledge of both fluid dynamics and thermodynamics:
therefore, some fundamental problems in thermodynamics and fluid
dynamics common to these machines have been covered in separate
chapters in the beginning. They provide the important link between the
engineering sciences and an important class of machines ( turbomachines)
used in a variety of industrial, power generation and aircraft propulsion

The overall performance and the importance of a given machine is better
appreciated when its role in relation to other components in the plant is
understood. Therefore, chapters on gas and steam turbine plants which
employ these machines have also been included and placed in the earlier
part of the book.