Feuerraum

Feuerraum is a German term for the chamber in which combustion occurs within a device. The word is used in engineering to denote spaces designed to withstand high temperatures and pressures where fuel and oxidizer react to produce heat and gases. In many contexts it is synonymous with the combustion chamber, though usage varies by field.

In boiler and steam‑engine technology, the Feuerraum refers to the firebox of a boiler. Fuel such as coal or oil is burned there to heat water and produce steam. The firebox is typically lined with refractory material and connected to the grate and ashpan; Feuerraumtüren (firebox doors) allow fuel loading and cleaning. Heat is transferred to the water through the boiler’s heating surfaces, and combustion gases exit after passing through the tubes and flues.

In rocket propulsion and high‑temperature gas turbines, the Feuerraum denotes the combustion chamber where propellants burn under high pressure. This chamber feeds the nozzle, converting thermal energy into kinetic energy. Combustion chambers are built to withstand extreme temperatures and pressures and often employ cooling systems and high‑temperature alloys. Injectors mix the propellants to promote efficient combustion. Depending on the context, Brennkammer or Brennraum may be preferred terms, but Feuerraum is also encountered.

The term reflects the common engineering principle of containing a controlled burn within a dedicated space, with design considerations focused on materials, cooling, insulation, and safe handling of hot gases.