DanNehmer wrote:
Question to the MA2A brain trust.......... specifically those who have worked on / serviced jet engines as I have remembered past conversations to have drifted too.
What is the typical injection pressure fuel is presented to the combustion chamber within the jet engine? Asking because i was asked to review a technical paper on jet fuel atomization and the paper is working in pressures of 1500 bar (21,700 psi) and that really seems more diesel injection pressures. I typically work with systems that are in the 2,000 to 2,500 bar (29,000 to 36,000 psi). My understanding of jet's is limited but since the fuel flow is continuous in nature and that requires a constant flow hydraulic pump I would have expected operating pressures to be 400 bar/6000psi or less.
Any comments or guidance that can be shared would be appreciated!
Thanks,
Dan
I began writing a whole lot of 'stuff' about 'stuff' that I think was irrelevant. I don't ever recall "measuring" fuel pressure. When engine performance degraded, it was noted via other measures, loss of power, EGT, EPR and a few other acronyms specific to an airframe/engine manufacturer. If I was to guess, I would say the fuel pressure was a low pressure system. Unlike the hydraulic system which requires high "pressure", the fuel system requires a high "rate". My guess would be 100-160 psi. That is not scientific, simply a guess, but I do not recall ever measuring fuel pressure. Someone could say "the fuel system doesn't have enough pressure to run the engine", however, the reality is the system is not producing the required fuel flow (rate).
I know that doesn't answer your question, sorry Dan.
Jun 28, 2021 at 01:56 PM
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