Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Quasiturbine engine takes in fuel after compression

  1. Aug 12, 2005 #1
    If the quasiturbine engine takes in fuel after compression and then burns it at constant volume, wouldn't that increase the efficiency of the process as constant volume burning is more efficient than constant pressure burning at same compression ratios?

    If such a burning is not possible, what are the reasons?


    edit: one more question

    Why are the quasiturbines not busting into the market because from the descriptions I read on the net, they offer huge advantages over other engine types.

    What about rotary vane engines. What is their status?
     
    Last edited: Aug 12, 2005
  2. jcsd
  3. Aug 17, 2005 #2
    Well, does anyone have any comments?
     
  4. Aug 17, 2005 #3

    Danger

    User Avatar
    Gold Member

    Patience, lad. I need some time to look it up; I never heard of a quasiturbine until you posted this.
     
  5. Aug 17, 2005 #4
    I guess I should have provided some links

    Here is the homepage of the quasiturbine
    http://quasiturbine.promci.qc.ca/

    Here is the patent application with diagrams
    http://quasiturbine.promci.qc.ca/QTAppl.html

    They say that the quasiturbine has the potential to run on detonation mode.

    At any rate one disadvantage I see is that the rotor will be very heavy to withstand the stress and will make throttling more difficult. Plus the flexible seal on top of the carriages will need to be very strong to withstand the shear stress. Same goes for the carriages. Plus the carriage wheels will generate a lot of friction with the casing.
     
    Last edited: Aug 17, 2005
  6. Aug 17, 2005 #5

    Q_Goest

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Just thinking out loud here, but I wonder how they intend to seal the sides and rollers in that engine. The same problems hold for vane type motors.

    For a recip engine, the combustion chamber is nicely sealed with piston rings. For this quasiturbine, there is no real sealing mechanism - the seal is accomplished by minimizing the gap which must change due to thermal gradients in the engine. A vane type has less of an issue, but it still is an issue. At least for a vane type, you have a sliding seal on the circumference, but you still only have a close fit on the sides. Any gas passing through that gap represents a loss in efficiency.
     
  7. Aug 17, 2005 #6
    The wiki article says that leakage problems encountered in the quasiturbine are similar to those encountered in early Wankel Engines but they have been brought under control.

    Here is the howstuffworks article.

    The official website claims that since the volume of the gas increases during combustion, during detonation the pressure peak is for a very short amount of time making this much more detonation compatible than the piston engine.
     
  8. Aug 17, 2005 #7

    FredGarvin

    User Avatar
    Science Advisor

    I must admit that this is the first I have read about these. They are interesting. The first thing that came to my mind is the complexity of the rotating components. The basic diagrams don't show too much but I would be worried about centrifugals on the "rotor" assembly. I'd also like to see how they actually attach a shaft to that rotor assembly. I haven't finished reading the entire site yet though.
     
  9. Aug 17, 2005 #8
    I would imagine the shaft will be directly attached to the rotor assembly though it would be very heavy to withstand the stress and would like generate good friction.

    Quasiturbines can even demonstrate near-continuous combustion delivering constant power.
     
    Last edited: Aug 17, 2005
  10. Aug 18, 2005 #9
    I don't know about quasi turbines but I know that regular turbines create a constant pressure (actually a slight pressure drop) in their combustion chambers in order to maintain a favorable pressure gradient for the flow.
     
  11. Aug 19, 2005 #10
    Well, what do you guys think of this? Is it worthy? One thing I was wondering about was in large quasiturbines there would be a substantial energy loss in trying to constantly rotate the carriages.
     
  12. Nov 23, 2005 #11
    Dagnabit. Now I am interested. Has anyone found any new info on this type of engine? I just recently stumbled on the howstufworks.com article and now I am interested in what some of the posters around here would say about it.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Quasiturbine engine takes in fuel after compression
  1. SI engine compression (Replies: 8)

  2. Compressed air as fuel (Replies: 10)

Loading...