Cumulative soot mass, mass flow rate, flux and concentration are all related via exhaust velocity
, pipe cross-sectional area and time.
The resulting inlet exhaust velocity
is 70m/s, which is beyond regular EGR operating conditions.
A turbocharger uses a radial in axial out turbine configuration which is influenced mainly by the exhaust velocity
Electric propulsion doesn't produce very much thrust because the engine is not expelling a lot of propellant, but the exhaust velocity
is very high--up to 90,000 mph with NEXT.
The first generation of subsonic jetliners was very noisy because of the high exhaust velocity
of their engines.
Although these rockets do their job well but they have fundamental energy limits, which restrict them to a maximum exhaust velocity
that is too low for most piloted missions with destinations beyond moon.
It may be noted that the plume rise as per ASHRAE 2007 (Equation 8) were functions of the exhaust velocity
Keeping a high value of the exhaust velocity
ensures a corresponding convective heat transfer coefficient.
However, the exhaust velocity
obtainable by such systems is limited.
For example, when the exhaust velocity
is high, the excess energy could be stored in a battery for later use during low-exhaust cycles.
Wind velocity, direction, exhaust outlet location relative to air intakes and doors, exhaust velocity
, and dilution at the exhaust outlet all influence possible re-ingestion.
While in the take-off and approach configuration (ejector aft), the hushkit forces exhaust through a uniquely designed nozzle into an ejector shroud that ultimately reduces exhaust velocity
, hence noise values.