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Thermoacoustic-Stirling ring generator, three 2 in units, pressurised

A double-acting thermoacoustic-Stirling generator in 2 in tri-clamp: three cores and three free-piston alternators in a loop, charged with helium, one propane / butane torch under a drum.

3 units · 20 bar helium · 25 Hz · onset 67 °C with the alternators open, 550 °C on the design load · ≈ 90 W electric for ≈ 341 W into the hot exchangers (27 %) at ±8 mm (model)

Exact dimensions. Every part is drawn at true size with no printing tolerance; each part's page lists its mating features and the fit each joint needs, so open those by your process's clearance before making the parts.

Used in Long Earth Society builds. Custom high-temperature thermoacoustic engine (final design)

53 parts, every one a file here · all STL URLs · Markdown · tick lines as you go (saved in this browser)

Assembled engine

A pressurised double-acting thermoacoustic-Stirling generator in 2 in tri-clamp: three vertical columns on a 160 mm circle, each a plain core spool with exchanger inserts and a screen regenerator over a honed cylinder whose free piston carries the alternator magnets, coils clamped outside, flexure carriers below, joined in a ring by ¾ in lines with fill, gauge and relief ports, one burner drum and flue over a torch; about 526 × 473 × 792 mm.

Assembly STEP (7.0 MB) · STL (22.5 MB) · 2112 parts

Build order

1. Stands: three short 2020 stands, one behind each column, rails on the bench; each column hangs from a hanger round its flexure carrier's neck.
2. Cores (bottom face down): 8.4 spacer, secondary exchanger, 180 liner, hot exchanger, 500 screen discs, main ambient exchanger, 8.4 spacer; gaskets and 2 in caps with the ¾ in ferrule on top.
3. Drum lower half over the three cores' lower ends before the cylinders go on; fin sleeves (optional) on the hot zones; drum upper half from the top; tabs bolted.
4. Power modules: mover (48 magnets on the core, sleeve over them, M4 rod into the crown) into each honed spool; carrier with stacks A and B threaded on the rod, nuts set so the leaves are flat at mid-stroke; stator halves round each spool, coils wound in place, return shell clamped; each module clamped under its core, a capped ¾ in ferrule under each carrier.
5. ¾ in lines: from under each column, elbow, 3 in spool, elbow up, riser (3 in spool, tee, custom spool, cross, 6 in spool), two elbows over into the top of the next column; caps with the fill valve on the tee, gauge and relief valve on the cross.
6. Water jackets (optional) over the ambient exchangers; torch stand under the flue; charge each line through its fill valve to 20 bar; leak-check; connect each alternator through its capacitor to its load before lighting the torch.

Agents: each row's object has /api/geometry?object=slug and the MCP tool get_free_files; the STL list above is every part.

JSON: /api/geometry?object=list-ta-ring-3x2in