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Oil-Free Turbojet Using MiTi® Foil Bearings & Korlon Coating

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Bearing Foil Foilbearing Free Heshmat Hooshang Innovative Korolon Miti Mohawk Oil Oil-free Oilfree Tech Turbo Turbojet
MohawkTechnology
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    MohawkTechn...
  • International International
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  • Added: 21-Nov-06

A 134 Newton thrust class, 120,000 rpm turbojet was redesigned to incorporate a high-temperature Korolon™ coated MiTi® air foil bearing aft of the turbine rotor and a compliantly mounted ball bearing forward of the centrifugal compressor—cold section. Two rotor-bearing system configurations were evaluated, one for operation above the bending critical speed and one for rigid rotor operation. Required characteristics for the MiTi® air foil bearing and generic ball bearing equipped with MiTi® compliant foil damper mount were determined through a series of design tradeoff studies evaluating critical speeds and system stability. Following the design studies, the necessary hardware was fabricated, the engine assembled and operation to full speed achieved. Engine speed, rotor vibrations, compressor discharge pressure, exhaust gas temperature, thrust and fuel consumption were all recorded for both a baseline fluid lubricated ball bearing supported engine and the new turbojet engine using the MiTi® hybrid foil bearing support system. Issues related to high-speed operation above the bending critical speed are identified and recommendations offered. Engine test data show that approximately 10% less fuel is consumed by the MiTi® hybrid foil bearing mount system than the baseline conventional design. It is also shown that the MiTi® foil bearing life was longer than the ball bearing life even though the MiTi® foil bearing operated in the exhaust gas stream at temperatures exceeding 800°C using our proprietary high temperature Korolon™ coating capable of 2000°. The results of this program demonstrate the feasibility of developing a completely oil-free MiTi® air foil bearing gas turbine engine.

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Comments on

Oil-Free Turbojet Using MiTi® Foil Bearings & Korlon Coating

15 Comments | Add Comment
  • I like to feel sexy ...

    I like to feel sexy....knowing someone is watching me ..wanting me...turns me on!BADLY! I like to flirt and pose..and sometimes i like to get WILD! how? ..he he..come in video and youll see:-)) maybe u can teach me something..or maybe i will ! come visit me at - MeetYourFling _dot_ COM - my user-id there is alisun-klbl chat soon on cam :-) lchqwiirba

    By Strike666 [Affiliate User] 1215957625 Reply Spam Moderate Up Moderate Down
  • What is the load ...

    What is the load carrying capacity and life of such bearings?Is the coating capable of start-stop sliding friction for a long time?

    By 19661947 [Affiliate User] 1212651481 Reply Spam Moderate Up Moderate Down
  • I noticed that ...

    I noticed that during the startup there were some indications of metal-fragments (sparks) in the flash of flame that exited the tailpipe. Where did these come from?

    By xjet [Affiliate User] 1210893277 Reply Spam Moderate Up Moderate Down
  • Awesome. The only ...

    Awesome. The only problem is when this wonderful technology will became available to the public.
    They have been around for years now ... same website, same videos, obscene prices, hello when are you guys deciding to let us use the %#$^&*& thing it's just little more than tin foil folded a certain way. The planet could use a little less oil on it's system NOW!

    By biggiginthesky [Affiliate User] 1208316281 Reply Spam Moderate Up Moderate Down
  • Awesome. The only ...

    Awesome. The only problem is when this wonderful technology will became available to the public.
    They have been around for years now ... same website, same videos, obscene prices, hello when are you guys deciding to let us use the %#$^&*& thing it's just little more than tin foil folded a certain way. The planet could use a little less oil on it's system NOW!

    By biggiginthesky [Affiliate User] 1208316202 Reply Spam Moderate Up Moderate Down
  • hi, im a student ...

    hi, im a student and i was very fascinated by your jet engine. i am interested in mechanics and technology and i thought this would be an excellent project for me and a few of friends and some teachers to work on. so if you could possibly send me some parts or even theblueprints used in your engine that would be much appreciated

    By cweimorts123 [Affiliate User] 1205790836 Reply Spam Moderate Up Moderate Down
  • I´d like to see a ...

    I´d like to see a complete shutdown.

    By diymania [Affiliate User] 1189341090 Reply Spam Moderate Up Moderate Down
  • Unfortunately ...

    Unfortunately development cost with Miti is very expensive and they quote "best efforts" only. They need to get real about the cost of the bearings, it ain't rocket science as they say

    By iceELEskate88 [Affiliate User] 1187397450 Reply Spam Moderate Up Moderate Down
  • Can you film the ...

    Can you film the complet start up?
    I love this sound
    Thanks

    By Andreasplanespotter [Affiliate User] 1186706144 Reply Spam Moderate Up Moderate Down
  • Hrmm, im sure my ...

    Hrmm, im sure my corolla would be loads faster if i had a few of those bad boys on it

    By loquat15 [Affiliate User] 1183573193 Reply Spam Moderate Up Moderate Down
  • very cool. Foil ...

    very cool. Foil bearings are the way to go with any very high speed turbine.

    By eblocksidge [Affiliate User] 1183065114 Reply Spam Moderate Up Moderate Down
  • nevermind I found it

    nevermind I found it

    By Machuse [Affiliate User] 1181538092 Reply Spam Moderate Up Moderate Down
  • Is there any ...

    Is there any information on the general construction of the engine. What is the compressor design (radial,axial)? Any website that talks about the project in general, looks like pretty cool stuff.

    By Machuse [Affiliate User] 1181537940 Reply Spam Moderate Up Moderate Down
  • Jet A fuel was used ...

    Jet A fuel was used. Jet A with a little oil added lubricated the forward ball bearing. A compliant foil air bearing made of high temperature nickel based super alloy coated with Korolon supported the engine's hot section. Korolon protects the bearing surface during start up and shut down when the shaft contacts the bearing. At operating speeds the shaft glides on a film of air. Bearing cost is coming down and will be competitive with current bearings when purchased in large quantities.

    By Jfwaltonii [Affiliate User] 1179592900 Reply Spam Moderate Up Moderate Down
  • From what I can ...

    From what I can gather Korolon is a coating which is used to reduce friction and wear between the bearing surface and the shaft. I looked into these bearings for an oil free turbo I was designing but sadly was told by my supervisor that they were too expensive - shame, because the alternative we came up with was false economy really. I will be watching developments with interest though!

    By Lounks [Affiliate User] 1173246251 Reply Spam Moderate Up Moderate Down
15 Comments | Add Comment