Integrated fuel injector igniters configured to inject multiple fuels and/or coolants and associated methods of use and manufacture

An injector comprising:

• a body having a first end portion and a second end portion;
• a first flow channel extending through the body, wherein the first flow channel receives a first fuel;
• a second flow channel extending through the body, wherein the second flow channel is separate from the first flow channel and electrically isolated from the first flow channel, wherein the second flow channel receives at least one of a second fuel and a coolant;
• and
• a valve carried by the body, wherein the valve is movable between a closed position and an open position to introduce at least one of the second fuel and the coolant into a combustion chamber.

A method of adaptively operating a fuel injector, the method comprising:

• introducing at least one of a first fuel and a first coolant into a first flow channel in a body of the injector;
• dispensing at least one of the first fuel and the first coolant from first flow channel into a combustion chamber in a first distribution pattern;
• introducing at least one of a second fuel and a coolant into a second flow channel in the body, wherein the second flow channel is fluidly separated from the first flow channel;
• dispensing at least one of the second fuel and the second coolant from the second flow channel into the combustion chamber in a second distribution pattern, wherein the second distribution pattern is different from the first distribution pattern;
• and
• when dispensing at least one of the first fuel and the second fuel, at least partially igniting the first fuel or the second fuel with an ignition feature carried by the body of the injector.