Patent ID: 8141334

Claim:
A combustor for a combustion turbine engine, the combustor comprising: a chamber defined by a combustor outer liner and a combustor outer wall and forming a channel between windows defined through the combustor outer wall toward a forward end of the chamber and at least one fuel injector positioned toward an aft end of the chamber; and a multilayer screen filter comprising at least two layers of screen over at least a portion of the windows and at least one layer of screen over the remaining portion of the windows; wherein the windows include a forward end and, adjacent to the forward end, a forward portion, and an aft end and, adjacent to the aft end, an aft portion; wherein the multilayer screen filter is positioned over the windows such that, in operation, a supply of compressed air entering the chamber through the windows passes through at least one layer of screen; and wherein the multilayer screen filter is configured such that the aft portion of the windows include at least two layers of screen, and the forward portion of the windows includes one less layer of screen than the aft portion of the windows.