Fuel Injector

Apparatus for injecting fuel into a combustion zone, comprising:

• an ejection chamber for holding a portion of a selected liquid fuel;
• an inlet valve arranged to selectively open to transfer liquid into the ejection chamber;
• and
• an exit valve arranged to selectively open to eject fuel from said ejection chamber when a parameter associated with said ejection chamber satisfies a predetermined condition, said exit valve further being arranged to open when a temperature of liquid in the ejection chamber is substantially equal to or greater than a saturation temperature associated with the liquid at a pressure equal to a pressure at a location downstream of said exit valve;
• wherein liquid and/or liquid vapor are ejected from the ejection chamber into the combustion zone via the exit valve thereby injecting fuel into the combustion zone.

A method for injecting fuel into a combustion zone, comprising the steps of:

• providing an ejection chamber arranged to hold a portion of a selected liquid fuel;
• selectively opening an inlet valve to transfer a portion of liquid into the ejection chamber;
• selectively opening an exit valve of said ejection chamber when a parameter associated with said ejection chamber satisfies a predetermined condition;
• and
• ejecting liquid vapor and/or liquid from the ejection chamber into the combustion zone via the exit valve.