Exhaust Cascaded Reuse for Internal Combustion Engines

Photo of Ian Bartonico, James Ekdahl, and Kyle Sommerfeld Students: Ian Bartonico, James Ekdahl, and Kyle Sommerfeld

Sponsor: Ron Voisin Consulting

Date: Fall 2009

Requirements:
MATLAB was chosen as the programming language to develop the model of the Voisin Cycle. In order maximize energy conversion, all of the exhaust gas must be used in the heat transfer to the water. In order to simplify the analysis, ideal Otto and Diesel cycles are modeled. Further, instantaneous heat transfer from the exhaust gases to the water is assumed.

Problem:
Typical combustion engines only convert about one-third of the thermal energy from combustion into work output. Utilizing the energy contained in the exhaust gases can increase the efficiency of these engines. One way to do this is to inject water into the engine and transfer the mixture into an adjacent, larger cylinder, creating a secondary power stroke from the generation of steam. This project focuses on developing a thermodynamic model of this engine cycle, the Voisin Cycle.

Solution:
The model returned results which indicate that the injection of water actually decreases the pressure, rather than raising it as was hypothesized. Although the cycle is more efficient than a regular Otto or Diesel cycle, it does not match the efficiency of an Otto- or Diesel-based Atkinson Cycle, where just exhaust gases are allowed to expand to atmospheric pressure.

Images related to the project:

Photo related to Exhaust Cascaded Reuse for Internal Combustion Engines project
Photo related to Exhaust Cascaded Reuse for Internal Combustion Engines project
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