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Stirling Cycle Engines: Inner Workings and Design

by

Stirling Cycle Engines: Inner Workings and Design Cover

 

Synopses & Reviews

Publisher Comments:

Some 200 years after the original invention, the internal design of a Stirling engine has come to be considered a specialist task, calling for extensive experience and for access to sophisticated computer modelling. The low parts-count of the type is negated by the complexity of the gas processes by which heat is converted to work. The design is perceived as problematic largely because those interactions are neither intuitively evident, nor capable of being made visible by laboratory experiment. There can be little doubt that the situation stands in the way of wider application of this elegant concept.

Stirling Cycle Engines re-visits the design challenge, doing so in three stages. Firstly, unrealistic expectations are dispelled: chasing the Carnot efficiency is a guarantee of disappointment, since the Stirling engine has no such pretentions. Secondly, no matter how complex the gas processes, they embody a degree of intrinsic similarity from engine to engine. Suitably exploited, this means that a single computation serves for an infinite number of design conditions. Thirdly, guidelines resulting from the new approach are condensed to high-resolution design charts – nomograms.

Appropriately designed, the Stirling engine promises high thermal efficiency, quiet operation and the ability to operate from a wide range of heat sources. Stirling Cycle Engines offers tools for expediting feasibility studies and for easing the task of designing for a novel application.

Key features:

  • Expectations are re-set to realistic goals.
  • The formulation throughout highlights what the thermodynamic processes of different engines have in common rather than what distinguishes them.
  • Design by scaling is extended, corroborated, reduced to the use of charts and fully Illustrated.
  • Results of extensive computer modelling are condensed down to high-resolution Nomograms.
  • Worked examples feature throughout.

Prime movers (and coolers) operating on the Stirling cycle are of increasing interest to industry, the military (stealth submarines) and space agencies. Stirling Cycle Engines fills a gap in the technical literature and is a comprehensive manual for researchers and practitioners. In particular, it will support effort world-wide to exploit the potential for such applications as small-scale CHP (combined heat and power), solar energy conversion and the utilization of low-grade heat.

Synopsis:

As the scientific, industrial and military importance of Stirling cycle machines grows, so does the design challenge.

A crucial aspect is thermodynamic design - dimensioning of the internal gas path in relation to operating parameters - working fluid, charge pressure, rpm and swept volume - with a view to achieving target performance. 

A design formula guaranteeing the desired outcome does not exist - even in the form of computer simulation. The very notion is probably a mirage.

The designer’s best hope lies in a two-pronged attack based firstly on insight into the complex gas process interactions, and secondly on rational design decisions having traceable outcome.

Stirling Cycle Engines elaborates on this approach through gas process modelling, design charts (nomograms) and comprehensively-worked examples.

Synopsis:

Comprehensively details how to design a stirling engine, focusing on     thermodynamic analysis and mechanical construction.

Stirling Cycle Engines: Inner Workings and Design comprehensivelydetails how to design a stirling engine, focusing on thermodynamic analysis and mechanical construction. It examines the problem of thermodynamic design and includes a number of worked examples as well as nomogram design charts.

Stirling cycle machines are becoming more relevant to industry and this design manual fills the gap in the market, providing a comprehensive reference for practitioners working in this area.

  • Comprehensively details how to design a stirling engine
  • Focuses on thermodynamic analysis and mechanical construction of stirling engines
  • Examines the problem of thermodynamic design
  • Includes worked examples
  • Provides nomogram design charts

Primary: Researchers and practitioners in industry (including design engineers working on stirling engines and energy companies)

Secondary: Graduate students and academic researchers in mechanical engineering departments.

Table of Contents

About the Author xi

Foreword xiii

Preface xvii

Notation xix

1 Stirling myth – and Stirling reality 1

1.1 Expectation 1

1.2 Myth by myth 2

1.3 …and some heresy 7

1.4 Why this crusade? 7

2 R´eflexions sur le cicle de Carnot 9

2.1 Background 9

2.2 Carnot re-visited 10

2.3 Isothermal cylinder 11

2.4 Specimen solutions 14

2.5 ‘Realistic’ Carnot cycle 16

2.6 ‘Equivalent’ polytropic index 16

2.7 R´eflexions 17

3 What Carnot efficiency? 19

3.1 Epitaph to orthodoxy 19

3.2 Putting Carnot to work 19

3.3 Mean cycle temperature difference, εTx = T – Tw 20

3.4 Net internal loss by inference 21

3.5 Why no p-V diagram for the ‘ideal’ Stirling cycle? 23

3.6 The way forward 23

4 Equivalence conditions for volume variations 25

4.1 Kinematic configuration 25

4.2 ‘Additional’ dead space 27

4.3 Net swept volume 32

5 The optimum versus optimization 33

5.1 An engine from Turkey rocks the boat 33

5.2 …and an engine from Duxford 34

5.3 Schmidt on Schmidt 36

5.4 Crank-slider mechanism again 41

5.5 Implications for engine design in general 42

6 Steady-flow heat transfer correlations 45

6.1 Turbulent – or turbulent? 45

6.2 Eddy dispersion time 47

6.3 Contribution from ‘inverse modelling’ 48

6.4 Contribution from Scaling 50

6.5 What turbulence level? 52

7 A question of adiabaticity 55

7.1 Data 55

7.2 The Archibald test 55

7.3 A contribution from Newton 56

7.4 Variable-volume space 57

7.5 D´esax´e 59

7.6 Thermal diffusion – axi-symmetric case 60

7.7 Convection versus diffusion 61

7.8 Bridging the gap 61

7.9 Interim deductions 64

8 More adiabaticity 65

8.1 ‘Harmful’ dead space 65

8.2 ‘Equivalent’ steady-flow closed-cycle regenerative engine 66

8.3 ‘Equivalence’ 68

8.4 Simulated performance 68

8.5 Conclusions 70

8.6 Solution algorithm 71

9 Dynamic Similarity 73

9.1 Dynamic similarity 73

9.2 Numerical example 75

9.3 Corroboration 79

9.4 Transient response of regenerator matrix 80

9.5 Second-order effects 82

9.6 Application to reality 82

10 Intrinsic Similarity 83

10.1 Scaling and similarity 83

10.2 Scope 83

10.3 First steps 88

10.4 …without the computer 90

11 Getting started 97

11.1 Configuration 97

11.2 Slots versus tubes 98

11.3 The ‘equivalent’ slot 102

11.4 Thermal bottleneck 104

11.5 Available work lost – conventional arithmetic 107

12 FastTrack gas path design 109

12.1 Introduction 109

12.2 Scope 110

12.3 Numerical example 110

12.4 Interim comment 118

12.5 Rationale behind FastTrack 118

12.6 Alternative start point – GPU-3 charged with He 121

13 FlexiScale 129

13.1 FlexiScale? 129

13.2 Flow path dimensions 130

13.3 Operating conditions 133

13.4 Regenerator matrix 137

13.5 Rationale behind FlexiScale 137

14 ReScale 141

14.1 Introduction 141

14.2 Worked example step-by-step 141

14.3 Regenerator matrix 145

14.4 Rationale behind ReScale 145

15 Less steam, more traction – Stirling engine design without the hot air 149

15.1 Optimum heat exchanger 149

15.2 Algebraic development 150

15.3 Design sequence 153

15.4 Note of caution 159

16 Heat transfer correlations – from the horse’s mouth 163

16.1 The time has come 163

16.2 Application to design 166

16.3 Rationale behind correlation parameters REω and XQXE 167

17 Wire-mesh regenerator – ‘back of envelope’ sums 171

17.1 Status quo 171

17.2 Temperature swing 171

17.3 Aspects of flow design 173

17.4 A thumb-nail sketch of transient response 181

17.5 Wire diameter 184

17.6 More on intrinsic similarity 190

18 Son of Schmidt 199

18.1 Situations vacant 199

18.2 Analytical opportunities waiting to be explored 200

18.3 Heat exchange – arbitrary wall temperature gradient 201

18.4 Defining equations and discretization 205

18.5 Specimen implementation 206

18.6 Integration 208

18.7 Specimen temperature solutions 211

19 H2 versus He versus air 215

19.1 Conventional wisdom 215

19.2 Further enquiry 216

19.3 So, why air? 217

20 The ‘hot air’ engine 219

20.1 In praise of arithmetic 219

20.2 Reynolds number Re in the annular gap 222

20.3 Contact surface temperature in annular gap 223

20.4 Design parameter Ld¨Mg 225

20.5 Building a specification 226

20.6 Design step by step 228

20.7 Gas path dimensions 229

20.8 Caveat 234

21 Ultimate Lagrange formulation? 235

21.1 Why a new formulation? 235

21.2 Context 235

21.3 Choice of display 236

21.4 Assumptions 238

21.5 Outline computational strategy 240

21.6 Collision mechanics 240

21.7 Boundary and initial conditions 244

21.8 Further computational economies 244

21.9 ‘Ultimate Lagrange’? 245

Appendix 1 The reciprocating Carnot cycle 247

Appendix 2 Determination of V2 and V4 – polytropic processes 249

Appendix 3 Design charts 251

Appendix 4 Kinematics of lever-crank drive 257

References 261

Name Index 267

Subject Index 269

Product Details

ISBN:
9781118818435
Author:
Organ, Allan J.
Publisher:
John Wiley & Sons
Subject:
Engineering - Mechanical
Subject:
Mechanical Engineering - Design
Subject:
Mechanical Engineering-General
Copyright:
Edition Description:
WOL online Book (not BRO)
Publication Date:
20140203
Binding:
HARDCOVER
Language:
English
Pages:
296
Dimensions:
244 x 170 mm

Related Subjects

Business » Accounting and Finance
Business » Personal Finance
Engineering » Construction » Heavy Machinery
Engineering » Mechanical Engineering » General
History and Social Science » World History » General

Stirling Cycle Engines: Inner Workings and Design New Hardcover
0 stars - 0 reviews
$140.00 In Stock
Product details 296 pages John Wiley & Sons - English 9781118818435 Reviews:
"Synopsis" by , As the scientific, industrial and military importance of Stirling cycle machines grows, so does the design challenge.

A crucial aspect is thermodynamic design - dimensioning of the internal gas path in relation to operating parameters - working fluid, charge pressure, rpm and swept volume - with a view to achieving target performance. 

A design formula guaranteeing the desired outcome does not exist - even in the form of computer simulation. The very notion is probably a mirage.

The designer’s best hope lies in a two-pronged attack based firstly on insight into the complex gas process interactions, and secondly on rational design decisions having traceable outcome.

Stirling Cycle Engines elaborates on this approach through gas process modelling, design charts (nomograms) and comprehensively-worked examples.

"Synopsis" by , Comprehensively details how to design a stirling engine, focusing on     thermodynamic analysis and mechanical construction.

Stirling Cycle Engines: Inner Workings and Design comprehensivelydetails how to design a stirling engine, focusing on thermodynamic analysis and mechanical construction. It examines the problem of thermodynamic design and includes a number of worked examples as well as nomogram design charts.

Stirling cycle machines are becoming more relevant to industry and this design manual fills the gap in the market, providing a comprehensive reference for practitioners working in this area.

  • Comprehensively details how to design a stirling engine
  • Focuses on thermodynamic analysis and mechanical construction of stirling engines
  • Examines the problem of thermodynamic design
  • Includes worked examples
  • Provides nomogram design charts

Primary: Researchers and practitioners in industry (including design engineers working on stirling engines and energy companies)

Secondary: Graduate students and academic researchers in mechanical engineering departments.

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