| 摘要 |
A turbine shroud includes a plurality of cavities for receiving cooling steam for flow through the cavities in series counterflow to the direction of the hot gases of combustion. In the first cavity, a projection forms a nozzle to increase the velocity of the cooling steam to increase the convection coefficient for cooling the wall of the shroud. The steam flow in the second cavity passes through an impingement plate for impingement cooling of the wall of the shroud. Likewise, steam passes from the second cavity into the third cavity for flow through an impingement plate for further impingement cooling of the wall of the shroud. In the second and third cavities, the impingement plates include a plurality of ducts affording increased flow area in the direction of travel of the post-impingement steam flow to reduce cross-flow effects.
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