High-output Turbocharging

  • N. Watson
  • M. S. Janota


The demand for higher and higher power outputs from a specified size of diesel engine continues. Higher outputs may be achieved by increasing speed and/or BMEP. In the last 25 years there has been a steady increase in rated mean effective pressure (figure 1.5) but only a relatively small speed increase. There are many reasons why it is difficult to increase the speed of an engine substantially. Limitations arise due to the inertia of reciprocating parts, deterioration of volumetric efficiency, air/fuel mixing problems, etc. Some limitations are absolute, in that engine damage will result if a certain speed is exceeded; others result in a progressively deteriorating engine fuel consumption (efficiency). Furthermore different limitations affect different types (and sizes) of engine. However, the potential for increasing engine speed is rather limited, although gradual progress will be made (figure 11.1).


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Copyright information

© N. Watson and M. S. Janota 1982

Authors and Affiliations

  • N. Watson
    • 1
  • M. S. Janota
    • 2
  1. 1.Imperial CollegeLondonUK
  2. 2.Queen Mary CollegeLondonUK

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