Annular combustion chamber for e.g. turboprop engine of airplane, has tubular guide comprising truncated conical wall provided with air passage openings to reduce aerodynamic pressure on guide and contact pressure of guide on spark plug

摘要

The chamber has a spark plug supported by an external casing, and a tubular guide (16) axially traversed by the spark plug. The guide is mounted with an axial clearance and a lateral clearance on a vent that is fixed on a revolution wall. A part i.e. truncated conical wall (18), of the guide is extended into an air circulation duct at an exterior of the chamber. The truncated conical wall comprises air passage openings (26) to reduce aerodynamic pressure on the guide and contact pressure of the guide on the spark plug. The openings have dimensions smaller than those of an end of the plug.