The airspray nozzle (Figure 7e19) carries a proportion
of the primary combustion air with the injected fuel. By
aerating the spray, the local fuel-rich concentrations pro-
duced by other types of spray nozzle are avoided, thus
giving a reduction in both carbon formation and exhaust
smoke. An additional advantage of the airspray nozzle is
that the low pressures required for atomization of the fuel
permit the use of the comparatively lighter gear-type
pump.