Xem Studiomeasured geometryThermoacoustic-Stirling hybrid loop with membrane, 2 in tri-clamp
The looped traveling-wave engine with a flat membrane clamped in the loop to stop steady flow round it: a thermoacoustic-Stirling hybrid in 2 in tri-clamp.
Legs 359 mm apart, core 6 in, regenerator Ø44 × 40 of 50-mesh × 0.22 mm screen (r_h 107 µm, porosity 0.66) · 286 Hz · onset ≈ 184 °C at the hot exchanger · ≈ 24 W of sound into a matched end load at 3 kPa (3 % of 1 bar) at the tee · flat membrane at the right leg's lower joint
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.
40 parts, every one a file here · all STL URLs · Markdown · tick lines as you go (saved in this browser)
| subsystem | object | parts | qty | note | |
|---|---|---|---|---|---|
| None | Sanitary clamp elbows | elbow-90-2in STEP · STL | 4 | the four corners of the loop | |
| None | Sanitary clamp tees and short-outlet tee | tee-2in STEP · STL | 2 | top: resonator branch up; bottom: capped branch toward the front (the feedback compliance) | |
| None | Tri-clamp spool (two ferrules on a tube) | tc-spool-2in-6in STEP · STL | 2 | left leg = the core (exchangers, regenerator, thermal buffer tube); right leg = feedback | |
| None | Tri-clamp spool (two ferrules on a tube) | tc-spool-2in-12in STEP · STL | 1 | resonator, up from the top tee | |
| None | Tri-clamp end cap | tc-cap-2in-flat STEP · STL | 1 | closes the bottom tee's branch | |
| None | Tri-clamp gasket | tc-gasket-2in STEP · STL | 10 | Type B at every joint except the membrane joint | |
| None | Tri-clamp clamp | clamp-half-2in STEP · STL | 22 | 11 joints, two halves each | |
| None | Socket head cap screws | shcs-m5x30 STEP · STL | 22 | two per clamp | |
| None | Hex nuts | nut-m5 STEP · STL | 22 | in the clamps' hex traps | |
| None | Thermoacoustic bore spacers and liners f | ta-spacer-2in-8.4 STEP · STL | 2 | core ends: gasket lip to each ambient exchanger | |
| None | Thermoacoustic heat exchangers | heat-exchanger-cold-2in STEP · STL | 2 | main ambient exchanger (top of the regenerator) and secondary ambient exchanger (bottom of the buffer tube) | |
| None | Regenerator cage for 2 in and 1.5 in tri | regenerator-cage-47-5x40 STEP · STL | 1 | under the main ambient exchanger | |
| None | Regenerator matrix disc Ø44 / Ø32 × 0.5 | mesh-disc-44mm STEP · STL | 80 | fill the cage, 40 mm: 50-mesh screen, 0.22 mm wire | |
| None | Dowel pins | dowel-3x30 STEP · STL | 1 | with the 3 × 10, fills the discs' Ø3 centre holes end to end (no bypass) | |
| None | Dowel pins | dowel-3x10 STEP · STL | 1 | ||
| None | Thermoacoustic heat exchangers | heat-exchanger-hot-2in STEP · STL | 1 | under the regenerator, inside the flame shroud | |
| None | Thermoacoustic bore spacers and liners f | ta-spacer-2in-61.7 STEP · STL | 1 | thermal buffer tube liner: hot exchanger down to the secondary exchanger | |
| None | Thermoacoustic water jacket | ta-jacket-half-2in-14 STEP · STL | 4 | two water jackets on the core, over the two ambient exchangers (9.35 from each face) | |
| None | Thermoacoustic hot-head shroud | ta-shroud-2in-front STEP · STL | 1 | flame shroud round the hot exchanger, with the flue down to the torch | |
| None | Thermoacoustic hot-head shroud | ta-shroud-2in-back STEP · STL | 1 | ||
| None | Socket head cap screws | shcs-m4x25 STEP · STL | 6 | jacket ears (4), shroud ears (2) | |
| None | Hex nuts | nut-m4 STEP · STL | 10 | jacket (4), shroud (2), hangers (4) | |
| None | Torch stand for a horizontal tri-clamp h | torch-stand-40 STEP · STL | 1 | on the bench under the flue, 25 below it; the heat source is a propane / butane torch head in the ring | |
| None | Set screws (grub screws) | set-m4x10 STEP · STL | 3 | centre the torch head in the ring | |
| None | Thermoacoustic driver cap | driver-cap-2in-40mm-speaker STEP · STL | 1 | closes the resonator; Ø28 port to the speaker cone | |
| None | 40 mm loudspeaker envelope (the speaker | speaker-envelope-40mm STEP · STL | 1 | 40 mm loudspeaker in the cap's socket, cone toward the gas: the alternator | |
| None | Tri-clamp diaphragm membrane | membrane-2in STEP · STL | 1 | in place of the gasket under the right leg: blocks the steady flow round the loop | |
| None | Tri-clamp diaphragm centre disc and back | diaphragm-disc-2in STEP · STL | 1 | centre disc, boss up into the right leg | |
| None | Tri-clamp diaphragm centre disc and back | diaphragm-backing-2in STEP · STL | 1 | under the membrane | |
| None | Socket head cap screws | shcs-m2x8 STEP · STL | 3 | heads under the backing disc | |
| None | Hex nuts | nut-m2 STEP · STL | 3 | on the centre disc | |
| None | 2020 aluminum extrusion | 2020-200 STEP · STL | 8 | per stand: two rails on the bench, two uprights | |
| None | L corner brackets for 20 | corner-bracket-20 STEP · STL | 8 | two per upright, front and back, onto its rail | |
| None | Button head socket screws | button-m5x10 STEP · STL | 16 | bracket screws, a washer each | |
| None | Flat washers | washer-m5 STEP · STL | 16 | ||
| None | Drop-in T-nuts for 20 | tnut-dropin-20-m5 STEP · STL | 20 | 8 per stand for the brackets, 2 per hanger | |
| None | Spool hanger collars | hanger-2in-tab STEP · STL | 2 | clamps a spool tube; its bar bolts to both uprights | |
| None | Spool hanger collars | hanger-2in-plain STEP · STL | 2 | the other half of each hanger | |
| None | Socket head cap screws | shcs-m5x16 STEP · STL | 4 | hanger bar into the uprights' T-nuts | |
| None | Socket head cap screws | shcs-m4x20 STEP · STL | 4 | close each hanger on its tube |
Assembled engine
The looped traveling-wave thermoacoustic engine in 2 in tri-clamp with a flat membrane clamped in the loop under the right leg and a 40 mm loudspeaker on its resonator; about 460 × 321 × 814 mm.
Assembly STEP (3.1 MB) · STL (16.5 MB) · 292 parts
Build order
- Stands: rails, uprights and brackets for two stands, one under the left leg and one under the right leg.
- Core (6 in spool, lower face down): 8.4 spacer on the lower lip, secondary exchanger, 61.7 liner, hot exchanger, cage with 80 mesh discs and the 3 × 30 + 3 × 10 dowels through their centre holes, main ambient exchanger, 8.4 spacer to the upper lip.
- Water jackets on the core 9.35 mm in from each face, one M4 × 25 and nut each side; shroud halves round the hot exchanger, flue to the front, M4 × 25 each side.
- Loop: bottom-left elbow, core, top-left elbow, top tee (branch up), top-right elbow, right 6 in spool, bottom-right elbow, bottom tee (branch to the front) back to the bottom-left elbow; Type B gaskets and clamps at all eight loop joints. Gasket, cap and clamp on the bottom tee's branch.
- Hangers on the core and on the right leg between the lower jacket and the shroud, bars to the uprights.
- Torch stand on the bench under the flue, torch head in the ring with its three M4 set screws.
- Membrane, discs and M2 screws assembled flat; clamped in place of the gasket between the bottom-right elbow and the right spool.
Agents: each row's object has /api/geometry?object=slug and the MCP tool get_free_files; the STL list above is every part.