Double Compression Expansion Engine: A Parametric Study on a High Efficiency Engine Concept

Paper #:
  • 2018-01-0890

Published:
  • 2018-04-03
Abstract:
The concept of splitting the compression and expansion strokes to achieve greater efficiency was presented in SAE Technical Paper 2015-01-1260, and the effect of heat release rate on the efficiency such an engine configuration was explored in SAE Technical Paper 2017-01-0636. This work explores an alternative configuration where the low pressure cylinders are connected to the combustion cylinders through large volumes which act as accumulators. The large volume between the combustor and expander was conceived to reduce flow losses by allowing gas transfer to occur at constant pressure. The indicated and brake thermal efficiencies (BTE) of this configuration at lambda 3 and 1.2 along with individual losses calculated using GT Power are presented in this work. A parametric study to understand the sensitivity of heat transfer rates in cylinders, pipes, and the large volumes on BTE was performed. The impact from dimensions on valves, pipes and ports was additionally explored. The simulations provided insights into the critical design elements that are necessary to be engineered for the success of this concept.
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