Ignition device, method for producing the same, ignition method and rocket combustion system

An ignition device comprising:

• a conductive solid fuel as a bulk fuel including:
• a plastic material, and
• a powdery conductive substance dispersed in the plastic material, the conductive solid fuel being gasified by heating due to energization and ignited by a reaction with an externally supplied oxidant;
• at least two electrodes partially embedded in the bulk fuel;
• wherein the bulk fuel is gasified by Joule heat that is generated by an electric current passing from one of the at least two electrodes through the bulk fuel including the powdery conductive substance toward another of the at least two electrodes, and
• said Joule heat is a heat generation phenomenon caused by formation of a conductive path inside the bulk fuel including the powdery conductive substance due to said energization with a voltage of 100 [V] or less and an electric power of 18 [W] or higher applied between the at least two electrodes.