Xem Studiomeasured geometryThermoacoustic standing-wave engine, 2 in spools
No pistons: a printed stack in a λ/4 tube of spools; a speaker turns the sound into electricity.
2 in × 6 in + 2 in × 12 in spools ≈ 470 mm closed-open → ~180 Hz · stack 40 mm at ~60 mm from the hot end · 1.3 mm cells (60% honeycomb infill)
6 printed parts · 6 bought lines · all printed STL URLs · Markdown · tick lines as you go (saved in this browser)
| subsystem | object | parts | qty | note | ||
|---|---|---|---|---|---|---|
| Hot end | Tri-clamp end cap and gasket | tc-cap-2in-flat STEP · STL | 1 | flame or nichrome coil | ||
| Spools | Tri-clamp spool (two ferrules on a tube) | tc-spool-2in-6in STEP · STL tc-spool-2in-12in STEP · STL | 2 | buy | stainless | |
| Joints | Tri-clamp end cap and gasket | tc-gasket-2in STEP · STL | 3 | buy | ISO 2852 Type B gaskets on the cold joints | |
| Clamps | Tri-clamp clamps (printable two-bolt) | clamp-half-2in STEP · STL | 6 | two halves per joint; stainless clamp at the flame side | ||
| Stack | Thermoacoustic stacks (slicer-infill bla | stack-blank-2in-40 STEP · STL | 1 | honeycomb infill = the stack | ||
| Heat exchangers | Copper pipe (ASTM B88 Type L and M) | copper-2in-typeL-50mm STEP · STL | 2 | buy | copper stubs / mesh on both stack faces | |
| Cold side | Regenerator and heat materials | ceramic-standoff-10x20 STEP · STL | 2 | standoffs + water jacket or fins | ||
| Driver / load | Thermoacoustic stacks (slicer-infill bla | driver-cap-2in-40mm-speaker STEP · STL | 1 | buy | 40 mm speaker | |
| Speaker | Speakers | 3968-speaker-40mm STEP · STL | 1 | buy | 40 mm 4 Ω | |
| Instruments | Instrumentation | probe-clamp-k-type-3mm STEP · STL probe-clamp-ds18b20-6mm STEP · STL | 2 | hot / cold temperatures | ||
| Insulation | Regenerator and heat materials | firebrick-230x114x64 STEP · STL | 1 | buy | under the burner |
Build order
- Print the stack blank with 1 perimeter, 0 top/bottom, honeycomb infill 60%.
- Copper heat-exchanger stubs on each face of the stack (or copper mesh discs).
- Hot cap on the 6 in spool; stack + exchangers 60 mm from it; 12 in spool; driver cap with the speaker at the open end.
- Heat the cap (flame or coil); it sings when the gradient is enough; load the speaker with LEDs through a rectifier.
Long Earth Society articles: custom high temp stirling thermoacoustic turbine test aluminum spool eddy currents temp rpm measurements
Agents: each row's object has /api/geometry?object=slug and the MCP tool get_free_files; the STL list above is the whole print job.