| 摘要 |
A shield is disposed in spaced relationship to the exterior surface of the combustor liner of a gas turbine engine and extends over a plurality of very small holes formed in the combustor liner so as to block flow of air to these holes. Further, the shield provides a space between the shield and the combustor liner for receiving reverse flow of air. A portion of the air flowing along the exterior surface of the combustor liner is diverted for reverse flow in the path provided between the shield and the combustor liner. A lesser plurality of substantially larger holes are provided in the combustor liner at the point of reversal of the air so that the dirt particles in the air, because of the centrifugal force acting thereon, tend to flow through these larger holes. A second group of larger holes are provided in the combustor liner approximately at the forward end of the space between the shield and the combustor liner. In flowing to the very small holes in the combustor liner the air must make a second reversal and substantially all of any remaining dirt particles are caused to flow through this second group of larger holes during this second reversal of air flow. Accordingly, the air reaching the very small holes in the combustor liner and being directed to the interior surface of the combustor liner for cooling thereof is substantially devoid of dirt particles and the possibility of plugging any of these very small holes is minimized.
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