Diesel injector and method utilizing focused supercavitation to reduce spray penetration length

摘要

A method and apparatus are disclosed for inducing a supercavitating flow inside a fuel injection nozzle orifice to reduce the penetration length of the fuel spray, maintain high levels of fuel atomization, and improve uniformity of the fuel spray exiting the nozzle such that high-pressure injectors can be used on small engines. This reduction in penetration length is accomplished without any reduction in upstream fuel pressure.

主权项

1. In a conventional fuel injector having a needle moveable along an axis, and a tapered wall nozzle injector tip with a cup-shaped portion at an end of the tapered wall downstream of the needle to define a sac volume therebetween and configured to extend into a combustion chamber of an engine, the improvement comprising the nozzle tip having in the tapered wall at least one fuel injection port directed at an angle to the axis and configured with an inlet section of constant diameter adjacent the sac volume and an outlet section of substantially greater length than the inlet section, the outlet section having a constant diameter larger than that of the inlet section through which exclusively fuel flows and sized to produce within the at least one inlet port supercavitating flow of fuel injected into the engine combustion chamber.