Engine displacer with regenerator channels

An engine assembly, the engine assembly comprising:

• a displacer, the displacer comprising:
• a body having a displacer first end surface, a displacer second end surface and a displacer longitudinal axis;
• and
• at least one channel extending between a first opening in the displacer first end surface and a second opening in the displacer second end surface and having sidewalls therebetween defining a channel flow path, wherein the first opening is located at a first radial distance from the displacer longitudinal axis in a first radial direction and the second opening is located at a second radial distance from the displacer longitudinal axis in a second radial direction;
• wherein at least a portion of the channel flow path has a component in an angular direction that is at an angle to both the first and second radial directions;
• and
• a displacer chamber forming an internal cavity,
• wherein, in the assembled position, the body of the displacer is housed within the internal cavity.

A displacer for moving a working fluid in a displacer chamber, the displacer comprising:

• a body with a displacer first end surface at one end, a displacer second end surface at another end and a displacer longitudinal axis;
• and
• at least one channel extending between the displacer first end surface and displacer second end surface, the at least one channel defining a channel flow path for the working fluid through the displacer, and wherein the at least one channel is angled in a direction that is azimuthal to a radial direction extending from the displacer longitudinal axis to the at least one channel to force the working fluid to swirl as it exits the channel,
• wherein the displacer chamber is operably coupled with an external heat source.