The Cyclone Engine is an adaptation of the Rankine.
Wikipedia -
The Rankine cycle is a cycle which converts heat into work. The heat is supplied externally to a closed loop, which usually uses water. This cycle generates about 80% of all electric power used throughout the world,[1] including virtually all solar thermal, biomass, coal and nuclear power plants. It is named after William John Macquorn Rankine, a Scottish polymath.