We know it's getting fuel because the fuel filter fills up and we
see fuel spray into the carb when the throttle is depressed.
This can also happen when there is insufficient connectivity to the fuel injectors which can cause an intermittent
fuel spray pattern into the intake system resulting in a lean fuel condition or the motor otherwise starving for fuel.
This led to the worldwide replacement of thousands of
fuel spray nozzles on hundreds of aircraft and millions of dollars in damages to the manufacturer and its insurer.
Jin Wang at Argonne National Laboratory used X-ray imaging
of fuel sprays and combustion processes inside a car engine to help design cleaner, cheaper engines.
Represented a manufacturer of jet
engine fuel spray nozzles in prosecution of commercial damage claim against supplier of super alloy forgings.
A new optical device at Sandia National Laboratories that helps researchers image pollutants in
combusting fuel sprays might lead to clearer skies in the future.
Initially, the researchers have focused on the combustion of
liquid fuel sprays found in engines, where the extreme pressures and temperatures create an environment that is optically challenging.
As a result, this new combustion strategy requires detailed knowledge of fundamental mechanisms,
including fuel spray and mixture preparation, detailed ignition chemistry mechanisms and concurrent numerical approaches to turbulence modeling and simultaneous reaction chemistry modeling.
Notable changes include a higher 11.5:1 compression ratio, a high - tumble intake port, a longer intake manifold,
micro fuel spray injection and low - friction valve lifters.
The new engine also received special piston cavities, which allow the initial combustion flames to propagate without interference, and new multi-hole injectors, which
enhance fuel spray characteristics.
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«The acquired data provides important insights into
the fuel spray motion as well as the timing and quantity of soot formed under a wide range of conditions,» said Sandia researcher Scott Skeen.
The pistons feature unique sculpted topography that was optimized via extensive computer analysis to precisely direct
the fuel spray for better mixing and more complete combustion.
Finally, the high pressure fuel injectors have six individually sized laser drilled holes to optimize
the fuel spray pattern.
The mixture formation itself is also enhanced by turbulences at the edges and inside the cone - shaped spray; these suck air particles into
the fuel spray, forming an optimally ignitable mixture.
These injectors optimize
the fuel spray pattern, and improve fuel atomization for increased fuel mileage and reduced emissions.
The key is in the control of
the fuel spray and the extremely rapid timing of the piezo nozzle, which allow the formation of a fuel - air mixture with the ideal flammability.
Finally, the high pressure fuel injectors have six individually sized laser - drilled holes to optimize
the fuel spray pattern.
A commercial airliner experienced an in - flight engine fire and shutdown in Paris that was linked to the failure of
the fuel spray nozzle.
The part at issue was
a fuel spray nozzle used in certain Rolls Royce engines installed on Airbus and Boeing aircraft.