Meet the editor

Dr Getu Hailu is currently an Assistant Professor of mechanical engineering at the University of Alaska Anchorage. He has more than 20 years of experience in research and teaching. His area of expertise is thermofluids, including thermal storages, building integrated photovoltaic thermal systems, solar energy, and air source heat pump application in cold regions. His teaching interests include courses in the thermofluids and renewable energy

areas including turbomachinery, both at the graduate and undergraduate level. He has authored/coauthored more than 40 refereed publications. He is a member of ASME, ASHRAE, and IBPSA.

Contents

**Section 1**

*by Getu Hailu*

*by Fangyuan Lou*

*by Akanksha Singh*

Pump Impellers

and Applications

**Section 3**

**Section 4**

*by Yan Li*

Direct-Drive Wind Turbines

**Section 2**

Introductory Chapter: Rotating Machinery

*Aldemir Ap. Cavalini Jr and Valder Steffen Jr*

*Edna M. de F. Viana and Carlos B. Martinez*

Advance Measurement Techniques in Turbomachines

**Preface III**

Introduction **1**

**Chapter 1 3**

Measurement, Control and Uncertainty Analysis of Turbo Machines **7**

**Chapter 2 9**

**Chapter 3 25**

**Chapter 4 43**

Wear and Abrasion of Turbo Machines **63**

**Chapter 5 65**

Vertical Axis Wind Turbines **85**

**Chapter 6 87**

*by Rodrigo O.P. Serrano, José G. do V. Moreira, Ana L.P. de Castro, Maria A. Pinto,* 

Methodology for Abrasive Wear Evaluation in Elevator Stage Centrifugal

Straight-Bladed Vertical Axis Wind Turbines: History, Performance,

Uncertainty Analysis Techniques Applied to Rotating Machines *by Fabian Andres Lara-Molina, Arinan De Piemonte Dourado,* 

Development and Control of Generator-Converter Topology for

## Contents


Preface

The topic of turbomachinery is vast and includes all rotating machines that transfer energy between a rotor and a fluid. These include wind turbines, hydro turbines, pumps, fans, and compressors. There is constant improvement in the design, testing, and failure diagnosis of turbomachinery. This book covers some selected topics of turbomachinery, such as advanced measurement techniques, abrasive wear of parts of turbomachinery, and uncertainty analysis. Modern measurement techniques for turbomachinery application including temperature, pressure, velocity, and strain/ stress measurements are included. A chapter is dedicated to methods of evaluation

Currently much attention is being given to renewable energy sources, and many countries have set a goal of reaching net zero energy in the near future. Wind turbines are among renewable energy technologies that are intended to help reach the goal of net zero energy in buildings. There are two types of wind turbines that are widely used: horizontal axis and vertical axis wind turbines (HAWTs and VAWTs). VAWTs have fewer parts when compared to HAWTs. VAWTs do not require yaw mechanisms for orienting the wind turbines towards the wind direction; the gearbox and the generator are located on the ground; and the tower does not have to be as strong as those used for HAWTs. Because of these reasons, VAWTs are more practical

for residential and small-scale applications. A chapter is dedicated to VAWTs.

**Getu Hailu**

USA

University of Alaska,

of abrasive wear of pump impellers.
