SYSTEM FOR INFRARED EMISSION SUPPRESSION (SIRES)

摘要

Film cooling apparatus adapted to be connected into a conduit carrying a hot exhaust gas. The apparatus comprises single walled contoured duct means connectible to said conduit and a centre-body aerodynamically shaped and supported within said duct means so as to form therewith an annular channel of zero pressure gradient. Slot means are provided in the single walled contoured duct means and in the centre body to enable a flow of cooling air over exterior surfaces thereof to maintain said surfaces at an acceptably low temperature. A network of ducting carries the cooling air to the contoured duct means and interior of the centre-body. The duct means and centre-body are preferably of circular cross-section taken orthogonally of the overall flow direction. The centre-body is an axisymmetric bulb having annular slots for directing the cooling air over the exterior of said bulb. The centre-body connects with a plenum chamber formed by said single walled duct means and an exterior section of the network of ducting. The plenum chamber is also connected to a source of cooling air. An entraining diffuser is connected to said contoured duct means downstream of the centre-body. Slots in the centre-body, duct means and entraining diffuser are preferably from about 0.25" to about 0.750" in width.