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Wankel Engine

  1. Feb 7, 2009 #1
    If a Wankel gasoline engine was to be fitted with a compact and efficient positive displacement additional expander unit such that the normal exhaust from the engine was further expanded down to atmospheric pressure before being released to atmosphere, what gain in thermal efficiency could be expected ?
    In principle an improved Atkinson Cycle would be achieved.
    Assume that the adiabatic efficiency of the expander device is 75% and that no gas transfer losses are incurred; that the exhaust gas condition at the time when the exhaust port of the engine opens is 950 C and 5.5 bar absolute pressure; and that the engine operates only at a single speed and at full throttle as could be used, for example, to drive a generator in a Series Hybrid electric vehicle.
  2. jcsd
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