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Turboshaft Engine with Radial Turbine

3D model description

This model is a turboshaft engine which uses a radial compressor and a radial turbine.
It is a type mainly used for compact engines. Example: APU (auxiliary power unit) etc.
This was created in order to use for the source of a shaft horsepower for turning other models (for example, main-gear box for helicopters, etc.) besides only explaining a structural aspect.
A home vacuum cleaner is used as the source of power of this model.
The features are as follows.
① Radial compressor (Impeller), Diffuser
② Radial turbine rotor, Turbine nozzle
③ Planetary reduction gears
④ Output shaft
⑤ Use metal ball bearings for all the rotating shafts.
⑥ Prepare the parts for reversing rotating direction.
⑦ In order to disassemble easily, introduce the clamp system and the finger screw.
⑧ The vacuum nozzle with the variable opening for speed control.

Since it rotates well beyond anticipation, it can use as the source of power.
But, the maximum allowable RPM and torque are not verified.
Please decide by self-responsibility.

Video: https://youtu.be/maxeQ6HPnNI

B. Assembly Manual (PDF format, total 20 pages)
The detail assembly manual including "Parts-List", "After printing treatment" and "Assembly procedure" are prepared based on "Standard Skill (Filing, Drilling, Tapping and painting)".
In order to make it rotate smoothly, careful eccentricity and gap adjustment are needed.

C. General Notes
1. Bearing
Metal Ball Bearing are used for every shafts. Refer to Appendix.
2. For M1.4 Screw
No need “Tapping”. Drill with φ1.0 drill then direct screw-in.
3. STL file
“ws” of last 2 digits of file name means “With Support” special designed.
Total STL files are 48 items including the optional items. (Vacuum Duct, Stand etc.)
4. Blending of the gear tooth profile is important to get smooth rotation.

Total Net Print Time: Approx. 72HR
- (Estimated as case of PLA, 0.4mm Nozzle, 0.2mm Layer Height, 40% infill and No raft and support)
Especially, Air-Intake-Case201mws.stl needs about 12 hours to print.
Note: When at actual print, each parameter may be adjusted by your experience.

[Update] 2019.05.07 Gear-Carrier102.stl changed, 2019.05.09.Assy-Manual typo revised

I do hope your success!!

3D printing settings

3D printing settings
Raft, Support, Layer Height, Infill: Depending on your experience.
But the parts having gear, small shaft and thin portion: 100% infill is recommended.
My models were printed by "idbox" using with 0.4 nozzle, 1.75 PLA.

  • 3D model format: STL and ZIP

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Creator

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Retired Aircraft Engine Engineer
Aichi, Japan
"Aircraft Engine Museum by 3D Printer Models"
http://www7b.biglobe.ne.jp/~konchan77/

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2 comments

Dear Muchesuw
This model is premised on use of the home type vacuum cleaner only. Please understand.
Most engines of actual helicopter are using the jet fuel of a kerosene type.
Interpreting the "gas" of your question as the fuel, I answer.
This fuel needs cautions for handling at the inflammable hazardous material.
Moreover, ignition, stable combustion, and shutdown require many precise control apparatus.
In order to obtain the high RPM for ignition especially, the electric-starter is also required.
If it is probably this size, it will be presumed that it is 10,000RPM or more.
These control apparatus is not common, unless it designs the apparatus suitable for each model, it does not operate well.
Furthermore, the measure against high temperature is required and a heat-resistant alloy is especially indispensable to Combustion liner, Turbine and Exhaust duct.
Combustion liner needs advanced design and examination with fueling nozzles, in order to obtain stable combustion and suitable turbine temperature.
Moreover, the measure against a high velocity revolution and the examination also become indispensable.
Various points which it should still be careful of are omitted although it is.
Anyway, I regard that the gas turbine engine for models using jet fuel is not marketed as the above reason being related.
First of all, after deciding the purpose of use, commercial rotation devices (motor, piston engine, etc.) are looked for.
Please refer to it above.
Thank you for the comment.

Dear Konchan77,
If I 3D print the parts with plastics and then cast parts with metal, would I be able to use a gas to run like the real helicopter engine for different applications (in small scales)?
Thank you very much.
-Solomon


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