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Location: 4. Concepts and Comparisons
Discussion: Dart's expansion chamber
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 white-smoke |
Dart's expansion chamber
Jun 28 2008, 6:32 AM EDT The Wankel engine is an Otto cycle engine. The expansion volume is equal to the compression volume. The D.A.R.T. engine uses a form of the Atkinson cycle, where the Expansion volume is greater than the compression volume. The Wankel's combustion chamber extends across the rotor face thus the expanding gases will not drive the rotor in only one direction if it was not for the inertia of the rotating masses. A Diesel engine can certainly achieve 50% efficiency. The size of the engine also contributes to the efficiency percentage. The volume of an engine increases by the cube of it dimensions, whereas the surface area only increases by the square of it dimensions. Large normally equates to increased efficiencies, the Airbus 380 would be a good example of its capacity to drag ratio. The same is true with engines when comparing volumetric efficiencies. Therefore the relative size of the engines must also be taken into consideration. I hope this clarifies the claims (White-Smoke) Do you find this valuable? |
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