Library › Stirling engines › Thermoacoustic & fluidyne ·

Thermoacoustic hot-cavity liners: Ø47.5 / Ø44 tubes that set a 40 mm hot exchanger flush with a closed hot end's face

Name: Thermoacoustic hot-cavity liners: Ø47.5 / Ø44 tubes that set a 40 mm hot exchanger flush with a closed hot end's face dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How do I hold a hot heat exchanger at the top of a closed tri-clamp hot end? · Hardware · basis: Design values: lengths = the hot section's inside depth (length − 3 mm closed end) − four 10 mm hot exchanger discs

Long Earth Society build part. The hot cavity of my modular thermoacoustic engine. The engines

Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features

sizes: 4 in table

Notes

A plain tube that stands on the inside of a closed 2 in hot end and holds the hot heat exchanger at its top, so the exchanger's top face is flush with the hot end's clamp face. The stack in the next section then stands on the exchanger, across the hot joint.
Bore Ø44: the gas inside the liner is the engine's hot cavity, the gas spring at the hot end that sets how much the gas moves through the stack. Outside Ø47.5: the spool bore, a slide fit.
It runs at the hot end's temperature: it has to take that temperature. The file is the geometry; what it is made of is the builder's choice.

Sizes

part	hot section	section length_mm	inside depth_mm	liner_mm	hot exchanger above_mm
ta-hot-liner-2in-17	cup-2in-60	60.0	57.0	17.0	40.0
ta-hot-liner-2in-47	cup-2in-90	90.0	87.0	47.0	40.0
ta-hot-liner-2in-77	cup-2in-120	120.0	117.0	77.0	40.0
ta-hot-liner-2in-109.4	closed-spool-2in-152.4	152.4	149.4	109.4	40.0

Mating features

Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.

feature	exact	mates with	fit	files
outside	Ø47.5	closed hot cup / closed-end spool bore Ø47.5	slide	all
inside	Ø44	hot cavity gas (no contact)	designed	all
lower end	flat ring Ø44–Ø47.5	the cup's closed end (inside floor)	designed	all
upper end	flat ring Ø44–Ø47.5	the lowest hot exchanger disc's outer ring	designed	all
length	17 / 47 / 77 / 109.4	sets the top hot disc flush with the hot section face	designed	all

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Xem Studio	tools/gen_ta_modular.py: the section geometry, the network model and every number on these pages	code	CC BY 4.0
Long Earth Society	Engine builds	web, video	LES site

Free files

★ Free files 4 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

ta-hot-liner-2in-17	hot-cavity liner Ø47.5 / Ø44 × 17: stands on the closed end of cup-2in-60 and carries the four hot exchanger discs, whose top is then flush with the face	STEP · STL
ta-hot-liner-2in-47	hot-cavity liner Ø47.5 / Ø44 × 47: stands on the closed end of cup-2in-90 and carries the four hot exchanger discs, whose top is then flush with the face	STEP · STL
ta-hot-liner-2in-77	hot-cavity liner Ø47.5 / Ø44 × 77: stands on the closed end of cup-2in-120 and carries the four hot exchanger discs, whose top is then flush with the face	STEP · STL
ta-hot-liner-2in-109.4	hot-cavity liner Ø47.5 / Ø44 × 109.4: stands on the closed end of closed-spool-2in-152.4 and carries the four hot exchanger discs, whose top is then flush with the face	STEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=thermoacoustic-hot-cavity-liner

Thermoacoustic hot-cavity liners: Ø47.5 / Ø44 tubes that set a 40 mm hot exchanger flush with a closed hot end's face, isometric render of a generated part — Render of ta-hot-liner-2in-77 from the free STEP; not to scale.

How it fits

In these build lists

Modular free-piston thermoacoustic engine, 2 in…A standing-wave thermoacoustic engine built from 2 in sanitary sections like Leg…

You might also need

Free

Modular free-piston thermoacoustic engine, 2 in tri-clamp (stack sections and a clamp-in linear alternator)56 linesassembled Free

Tri-clamp closed-end spool: 2 in × 152.4 mm (6 in) with a welded closed end, isometric render of a generated part

Tri-clamp closed-end spool: 2 in × 152.4 mm (6 in) with a welded closed end4 sizes★ 1 file Free

Tri-clamp cups: closed-end spools (ferrule on a capped tube), 1.5, 2 and 3 in, isometric render of a generated part

Tri-clamp cups: closed-end spools (ferrule on a capped tube), 1.5, 2 and 3 in14 sizes★ 14 files Free

Thermoacoustic heat exchangers, hot and cold, parallel plate, for 1.5, 2 and 3 in tri-clamp spools, isometric render of a generated part

Thermoacoustic heat exchangers, hot and cold, parallel plate, for 1.5, 2 and 3 in tri-clamp spools3 sizes★ 6 files Free

Thermoacoustic bore spacers and liners for 2 in tri-clamp spools: 8.4, 60 and 61.7 mm, isometric render of a generated part

Thermoacoustic bore spacers and liners for 2 in tri-clamp spools: 8.4, 60 and 61.7 mm3 sizes★ 3 files

Questions

Why a liner and not a ledge?

A closed-end spool is plain tube inside; a liner standing on the closed end puts the exchanger exactly at the top without any welding or machining of the spool.

Which liner for which hot section?

Match the hot section: the table lists the liner for each closed hot end that takes the modular engine's column.