Heat Transfer and Internal Flow in a Cylinder
The goal is to develop an easy to use software tool for prediction of heat transfer and internal flow inside the compressor cylinder including the interaction with the valve cages and valves. This software tool will include a three dimensional Euler code supplemented with a solver for boundary layer equations for the heat transfer.
Lightweight Materials for Compressor Pistons
The goal was to find a suitable non-conventional material that can be used as lightweight construction material for a piston of a reciprocating compressor. Literature surveys were done followed by material testing including a specially developed Gigacyle cycle fatigue test. Concept designs were made and a demonstrator piston was constructed and thoroughly tested to determine the long term fatigue bahaviour. It was concluded that up to 50% weight reduction seems feasible by using a special type of polymer.
Survey of Gas Solubility in Lubricants
The goal was the summary of knowledge about the change of the thermodynamic and transfer properties of lubricants especially under the influence of gas solubility. Literature surveys and measurements show that with increasing pressure and decreasing temperature the amount of dissolved gas increases and so e.g. the viscosity decreases.The effect of different types of gases like methane, ethane, carbon dioxide, hydrogen show that measurements are still needed for verifying pre-calculated properties. In this project also different kind of measurement devices for the measurement of the density, viscosity, vapor pressure (solubility measurements), mixing gaps, chemical reactions and surface tension were built up or developed.