Very interesting, my failing memory forgets his name but may Gary but he
helped up obtain the design from his father and we made copies of the
Lockwood pulse jets which had 3 rearward facing intake port where propane
was injected and mixed with incoming air. Lost touch with the Lookwoods
over the years, I wonder how they are.
Ken
On Mon, Feb 15, 2021 at 1:47 AM Ben Brockert <wikkit@xxxxxxxxx> wrote:
In pulse jets the situation is much different, the oscillating flow
makes augmentation work much better. Lockwood himself did a lot of the
research on it, there are good papers describing optimum geometry. On
valveless engines the intake side is the bigger win.
Pulse detonation rocket engines might also respond unusually well to
atmospheric augmentation at low velocities. I feel like unsteady flow
engines in general are under-researched; most engineers don't want to
deal with the complexities.
On Fri, Feb 12, 2021 at 11:16 PM roxanna Mason
<rocketmaster.ken@xxxxxxxxx> wrote:
a bellmouth inlet and a slight tapped exhaust cone,<5 degrees.
I thought the tube should have a slight expanding taper/venturi so when
the hot exhaust met the cool air and mixed in the tube they would expand.
That is correct,
On an 85LbF Lockwood pulse jet powered GoKart, we used an augmentor with
While I never measured the thrust increase the owners claimed doubledigit augmentation.
wrote:
K
On Fri, Feb 12, 2021 at 12:27 PM Peter Fairbrother <peter@xxxxxxxxxx>
it
On 12/02/2021 14:07, Nels Anderson wrote:
On 2/11/21 4:59 PM, Henry Spencer wrote:
On Thu, 11 Feb 2021, Norman Yarvin wrote:
If ambient air is mixed into the exhaust as a working fluid, then
expand.will expand, conceivably generating additional thrust.
Still, to be realized, that thrust would have to actually exert
pressure somewhere, and the walls of that aluminum tube are parallel
to the flow, so that couldn't be where. (The bell-shaped portion is
the intake, not the exhaust.)
Other things being equal -- a big assumption -- suction in a
forward-facing intake bell is just as good as pressure in an
aft-facing nozzle bell.
Or how about simply increasing pressure at the original (w/o
augmentation tube) nozzle exit.
I thought the tube should have a slight expanding taper/venturi so when
the hot exhaust met the cool air and mixed in the tube they would
Never tried it though.
Peter Fairbrother