Quote:
Originally Posted by oil pan 4
So which is it? Mass flow or pressure drop?
If its not a heat engine then why isnt some one injecting water into the exhaust stream and seeing major gains in turbine performance, proving aerospace and mechanical engineers all wrong.
If a turbocharger is not a heat engine then why did an aerospace engineer I know go to great lengths to insulate the piping on his diesel for the specific reason of getting as much heat as possible to the turbine inlet?
Maybe you are right and engineers are all just stupid. It could easily be proven with the water injected steam turbine thingy. Seems easy enough to prove, take a diesel put water injection on the exhaust, flip the switch on off on off results in test complete. I would do it but I know it would be a waste of time, first of all it wont work and then when it fails you will claim it failed because my bias.
A true believer needs to see it fail first hand, back to back, over and over.
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Of course temperature and pressure directly affect the flow through the turbine. They are also linked together. Increasing temperature usually results in increased pressure and the ability to move the mass of the gas more rapidly providing more potential for work per unit time ( power ).
This why it makes sense to have a free flowing exhaust to reduce pressure robbing bends. And insulating the exhaust preserves as much of the heat ( temperature ) to do work on the turbine. Again, the temperature of a gas is a measure of how much each molecule is vibrating and moving and impacting a barrier resulting in pressure.
And sometimes injecting water into the exhaust stream can yield greater mass flow and power out of a turbo but under very specific caveats.