Book contents
- Frontmatter
- Contents
- Preface
- Foreword
- Part I Cycle Analysis
- Part II Component Analysis
- 4 Diffusers
- 5 Nozzles
- 6 Axial Flow Compressors and Fans
- 7 Centrifugal Compressors
- 8 Axial Flow Turbines
- 9 Combustors and Afterburners
- 10 Ducts and Mixers
- Part III System Matching and Analysis
- Part IV Appendixes
- References
- Answers to Selected Problems
- Index
9 - Combustors and Afterburners
Published online by Cambridge University Press: 05 June 2012
- Frontmatter
- Contents
- Preface
- Foreword
- Part I Cycle Analysis
- Part II Component Analysis
- 4 Diffusers
- 5 Nozzles
- 6 Axial Flow Compressors and Fans
- 7 Centrifugal Compressors
- 8 Axial Flow Turbines
- 9 Combustors and Afterburners
- 10 Ducts and Mixers
- Part III System Matching and Analysis
- Part IV Appendixes
- References
- Answers to Selected Problems
- Index
Summary
Introduction
The burner and afterburner are the only components through which energy is added to the engine. That is, in these two components the total temperature of the gas increases. For the primary burner, a part of this energy is used by the turbine to drive the compressor, and the other part is left to generate a high-velocity gas from the nozzle, generating thrust. For the afterburner, all of this energy increase is used to generate an increase of the fluid enthalpy and consequently a higher velocity gas from the nozzle, generating more thrust. As a result of these direct impacts, efficient operation of these components is necessary for the overall efficiency of the engine. However, several complex considerations must be realized in the design of either of these components, and some of the more advanced topics are summarized by Lefebvre (1983) and Peters (1988). Furthermore, Malecki et al. (2001) demonstrate the application of CFD predictions to modern combustor design.
The following are essential considerations in the design of a burner:
A major objective is complete combustion or fuel will be wasted.
Minimal total pressure loss is another important design goal. As discussed in Section 9.2, these first two objectives are in direct conflict.
All of the combustion must take place in the combustor and not the turbine, or the turbine life will be reduced.
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- Information
- Fundamentals of Jet Propulsion with Applications , pp. 440 - 470Publisher: Cambridge University PressPrint publication year: 2005