What is compression ratio value for stirling engine?

The compression ratio for a Stirling engine typically ranges from 2:1 to 4:1, depending on the design and operational requirements. This ratio represents the volume of the working gas at the bottom of the power stroke compared to the volume at the top of the compression stroke. A higher compression ratio can improve efficiency but may also increase mechanical stress and complexity. Thus, the optimal compression ratio is often a balance between efficiency and engine durability.