fuel % evaporated vs temp graphs at reduced pressure 1

[radomir]

Dear Ladies and Gentlemen

Is it possible to find somewhere on the web "S" diagrams (% evaporation vs. temperature) for gas turbine fuels (e.g. JP4, JP5 etc.) but for nonstandard ambient pressures (lower than 14.7 psia=1 atm).

I am trying to estimate a fuel pump cavitation intensity at an inlet pressure of about 10 psia (0.7 atm) and I was not able to find relevant data on the web.

Thank you in advance, Rad.

 

[radomir]

PS to the above query.

Formal term used for what I am asking for is:

"Boiling Range Distribution" diagrams for jet fuels

But not the standard ones, at atmospheric pressure (tests per ASTM D2887 or D3710 etc.). I would like to find the diagrams at reduced pressures, around 0.7 of standard atmospheric (barometric) pressure.

Thanks Rad

 

[TD2K]

I have not seen these curves. What is a fuel pump cavitation index, maybe there is some other way to generate the data you need?

 

[radomir]

TD2K thank you for the imput. It seams that fuel pumps do not have cavitation index. Better to say it is impossible to calculate it because there is no single, a unique pv (vapour pressure) or maybe I am wrong. As fare as I know fuels are compounds of several hydrocarbons (that is more your field than mine) with various boiling points.

Nevertheless I should contact the pump manufacturer (if it still exists) and bug those guys.

Thanks, Rad

 

[TD2K]

Jet fuels do have a vapor pressure even though they are made up a mixture of hydrocarbons. The vapor pressure is not 'uniquely' fixed but it won't vary much.

See thread124-27883 for a discussion how to estimate the vapor pressure off the flash temperature. The API data books (or a manual calc) will allow you to estimate the vapor pressure at another temperature.

 

[radomir]

Sir TD2K (I suppose that you are not a Lady),

You are really one of the most helpful and knowledgeable member of all the forums. Thank you very much again and all the best to you.

Rad

 

[TD2K]

No, you're right, I'm not a lady. But, I'm also not much of a gentleman either ;-)

Glad I could help.