Rotary engine with dual-fuel injectors

A method of supplying fuel to a rotary engine having a pilot subchamber fluidly connected to a rotor cavity defined by an outer body and a fuel injector, comprising:

• determining a position of the rotary engine relative to a city or an airport;
• injecting a heavy fuel in the rotor cavity via the fuel injector when the position of the rotary engine is outside a vicinity of the city or the airport;
• and
• injecting an alternative fuel different than the heavy fuel in the rotor cavity via the fuel injector when the position of the rotary engine is in the vicinity of the city or the airport.

A rotary engine, comprising:

• an outer body defining a rotor cavity;
• a rotor rotatable within the rotor cavity and in sealing engagement with walls of the outer body and defining at least one chamber of variable volume in the rotor cavity;
• a pilot subchamber defined by the outer body, the pilot subchamber having an outlet in fluid flow communication with the rotor cavity;
• a main fuel source of a heavy fuel;
• an alternative fuel source of an alternative fuel different from the heavy fuel;
• a main injector having a tip in fluid communication with the rotor cavity at a location spaced apart from the outlet of the pilot subchamber, the main injector having a first main inlet fluidly connected to the main fuel source, a second main inlet fluidly connected to the alternative fuel source, a first main outlet defined by the tip and fluidly connectable to the first main inlet, and a second main outlet defined by the tip and fluidly connected to the second main inlet, the main injector configured for injecting a selected one of the heavy fuel and the alternative fuel into the rotor cavity;
• and
• a pilot injector having a tip in fluid communication with the pilot subchamber, the pilot injector having a first pilot inlet fluidly connected to the main fuel source, a second pilot inlet fluidly connected to the alternative fuel source, a first pilot outlet defined by the tip and fluidly connectable to the first pilot inlet, and a second pilot outlet defined by the tip and fluidly connectable to the second pilot inlet, the pilot injector configured for injecting a selected one of the heavy fuel and the alternative fuel into the pilot subchamber.