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5487 results in Thermal-fluids engineering

Page 35 of 275

Advanced Turbulent Combustion Physics and Applications
  • Edited by N. Swaminathan, X.-S. Bai, N. E. L. Haugen, C. Fureby, G. Brethouwer
  • Published online:
    09 December 2021
    Print publication:
    06 January 2022
  • Explore a thorough and up to date overview of the current knowledge, developments and outstanding challenges in turbulent combustion and application. The balance among various renewable and combustion technologies are surveyed, and numerical and experimental tools are discussed along with recent advances. Covers combustion of gaseous, liquid and solid fuels and subsonic and supersonic flows. This detailed insight into the turbulence-combustion coupling with turbulence and other physical aspects, shared by a number of the world leading experts in the field, makes this an excellent reference for graduate students, researchers and practitioners in the field.

  • 8 - Thrust Augmentation

  • from Part II - Air-Breathing Engines
  • Paul G. A. Cizmas, Texas A & M University
  • Book:
    Aerothermodynamics and Jet Propulsion
    Published online:
    14 January 2022
    Print publication:
    02 December 2021, pp 381-381

  • Summary

    Thrust augmentation is usually needed for a short time period at (1) takeoff, (2) climb, (3) combat, and (4) high speed performance. Thrust augmentation allows us to avoid using a bigger (and heavier) engine that would penalize the performance of the aircraft when the additional thrust is not necessary. In other words, instead of utilizing a heavier and more powerful engine whose maximum power is only needed for a short period of time, it is often better to use a smaller engine that produces the required short-duration thrust by power augmentation. This section presents three methods of thrust augmentation: (1) water injection, (2) afterburning, and (3) inter-turbine combustion.

  • 5 - Introduction to Combustion

  • from Part I - Basic Fluid Mechanics and Thermodynamics for Propulsion
  • Paul G. A. Cizmas, Texas A & M University
  • Book:
    Aerothermodynamics and Jet Propulsion
    Published online:
    14 January 2022
    Print publication:
    02 December 2021, pp 157-157

  • Summary

    Combustion is the process that heats the working fluid in a jet engine. Combustion is a particular chemical reaction that has the following specific characteristics: (1) it is exothermic, (2) it is a fast oxidation of the combustion mixture, and (3) it is associated by light emission. The majority of chemical reactions take place in the flame, which is the region where the oxidation is visible.

  • 6 - Thermodynamics of Air-Breathing Engines

  • from Part II - Air-Breathing Engines
  • Paul G. A. Cizmas, Texas A & M University
  • Book:
    Aerothermodynamics and Jet Propulsion
    Published online:
    14 January 2022
    Print publication:
    02 December 2021, pp 195-280

  • Summary

    This chapter presents a thermodynamic analysis of various types of jet engines. The general thrust equation, introduced based on simple reasoning in , is derived using a rigorous approach based on mass and momentum conservation equations. The performance parameters needed to evaluate propulsion systems are presented next. The Brayton cycle, the ideal cycle of a jet engine, is then discussed. The assumptions of the Brayton cycle are gradually relaxed, and the real cycles of turbojet, turbofan, turboprop/turboshaft and ramjet engines are subsequently presented.

  • 3 - Steady One-Dimensional Gas Dynamics

  • from Part I - Basic Fluid Mechanics and Thermodynamics for Propulsion
  • Paul G. A. Cizmas, Texas A & M University
  • Book:
    Aerothermodynamics and Jet Propulsion
    Published online:
    14 January 2022
    Print publication:
    02 December 2021, pp 57-106

  • Summary

    The mass, momentum, and energy balance equations and the second law of thermodynamics equation are used to model the transport phenomena in propulsion systems. A simplified version of these equations that assumes the flow is steady and one-dimensional is frequently used for the pre-design and analysis of the propulsion systems.

Page 35 of 275