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February 13, 2026SAE International Journal of Engines

The Membrane Engine: Concept, Model, and First Results

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Authors

RARoland AllmägiRIRisto Ilves

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Overview

This investigation reveals the operational viability of a membrane engine in internal combustion systems, suggesting new design possibilities.

Key Points

  • The aim is to verify the operational feasibility of a novel membrane engine architecture as a functional internal combustion engine.
  • Developed a mathematical model to describe membrane deformation and its impact on combustion chamber volume.
  • Modified a single-cylinder piston engine to create a membrane engine prototype.
  • Conducted experimental tests under motored and fired conditions for performance comparison against the original engine.
  • Confirmed that the membrane engine can sustain combustion and generate torque.
  • Observed a steeper pressure drop during the exhaust stroke, indicating improved gas scavenging.
  • Torque measurements showed a notable positive spike following combustion, aligning with theoretical expectations.

Cite This Study

Allmägi et al. (2026) studied this question.

synapsesocial.com/papers/698ebf4385a1ff6a93016784https://doi.org/10.4271/03-19-01-0003
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