[AR] Re: Orions and PDEs (was Re: More MAX delays.)
- From: "JOHN HALPENNY" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "j.halpenny" for DMARC)
- To: <arocket@xxxxxxxxxxxxx>
- Date: Mon, 27 Jan 2020 16:24:45 +0000 (UTC)
Is a PDE somewhat like a diesel engine - much faster detonation, higher
pressure, more efficient but with a heavier engine?
John
On Monday, January 27, 2020, 09:35:20 a.m. GMT-5, Jim Davis
<jimdavis2@xxxxxxxxxxxxx> wrote:
It seems rather puzzling, though, where such an advantage might come
from.
It works on a different thermodynamic cycle. A PDE approximates constant volume
heat addition, meaning it is working on the Humphrey cycle (characterizes by
constant volume heat addition, constant pressure heat rejection) rather than
the Brayton cycle (constant pressure heat addition, constant pressure heat
rejection) of conventional rocket and gas turbine engines. Expansion is (close
to) isentropic in both cycles.
Jim Davis
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