How do they recover the methanol? Wouldn't most of the spray be blown into
the engine with the airflow?
On Fri, Feb 23, 2018 at 9:54 AM, Carlo Vaccari <airplaniac2002@xxxxxxxxx>
wrote:
They inject it near the outlet of the heat exchanger, recover it there,
inject it a bit more upstream, recover that (mixed with ever increasing
amounts of water) before the first injection point, inject it even further
upstream, etc.
The purest methanol is used for the coldest part of the heat exchanger and
the most waterlogged methanol is used for the warmest part at the inlet.
On Feb 23, 2018 11:47 AM, "Evan Daniel" <evanbd@xxxxxxxxx> wrote:
What is meant by "counter flow" here? The usual term of a fluid
flowing in the opposite direction? How do they get the methanol to
flow against that wind?
I would have assumed methanol de-icing meant something like spraying
methanol into the airstream upstream of the heat exchanger, but that
wouldn't be counterflow.
Evan Daniel
On Fri, Feb 23, 2018 at 11:32 AM, Keith Henson <hkeithhenson@xxxxxxxxx>
wrote:
Norman Yarvin <yarvin@xxxxxxxxxxxx>
I'm also wondering about something even more basic: what are theygoing to do about condensation freezing up on the heat exchanger?
They solved this years ago but it was kept a trade secret until the
AFRL got involved, then they patented it.
I had figured they used a superhydrophobic coating on the tubes where
the water would never stick but just hop off as it condensed. But no,
they use a counter flow of methanol to keep ice off the tubes. This
has been tested at close to full scale.
Keith