Impingement cooling mechanism, turbine blade and combustor
The present invention relates to an impingement cooling mechanism that ejects a cooling gas toward a cooling target ( 2 ) from a plurality of impingement holes ( 3 b ) formed in a facing member ( 3 ) that is disposed facing the cooling target ( 2 ). Blocking members ( 5 ) that block a crossflow (CF), which is a flow formed by the cooling gas after being ejected from the impingement holes ( 3 b ), are installed on at least the upstream side of the crossflow (CF) with respect to at least a portion of the impingement holes ( 3 b ). Turbulent flow promoting portions ( 6 ) are provided in the flow path (R) of the crossflow (CF) regulated by the blocking members ( 5 ).
1. An impingement cooling mechanism that ejects a cooling gas toward a cooling target from a plurality of impingement holes formed in a facing member that is disposed facing the cooling target, the impingement cooling mechanism comprising:
blocking members configured to block a crossflow, which is a flow formed by the cooling gas after being ejected from the impingement holes, configured to be installed on at least the upstream side of the crossflow with respect to at least a portion of the impingement holes, and the blocking members comprise: a first plurality of blocking members arranged in a first row; and a second plurality of blocking members arranged in a second row such that each blocking members of the second plurality of blocking member is adjacent a respective blocking member of the first plurality of blocking members;
a flow path of the crossflow formed between the first plurality of blocking members and the second plurality of blocking members; and
turbulent flow promoting portions provided in the flow path, wherein a width of the turbulent flow promoting portions is nearly equal to a width between the adjacent first plurality of blocking members and the second plurality of blocking members.
2. The impingement cooling mechanism according to claim 1 , wherein the blocking members are provided so that a gap between adjacent blocking members on the upstream side of the crossflow is narrow, and the gap between adjacent blocking members on the downstream side of the crossflow is wide.
3. The impingement cooling mechanism according to claim 1 , wherein the turbulent flow promoting portions are provided so that the turbulent flow promoting effect becomes low at the upstream side of the crossflow, and the turbulent flow promoting effect becomes high at the downstream side of the crossflow.
4. The impingement cooling mechanism according to claim 1 , wherein the impingement holes are arranged in the flow path of the crossflow that is regulated by the blocking members.
5. The impingement cooling mechanism according to claim 1 , wherein each blocking member of the blocking members comprises:
a plate-shaped portion; and
protruding portions that project out from the plate-shaped portion.
6. A turbine blade comprising the impingement cooling mechanism according to claim 1 .
7. A combustor comprising the impingement cooling mechanism according to claim 1 .
8. The impingement cooling mechanism according to claim 2 , wherein the turbulent flow promoting portions are provided so that the turbulent flow promoting effect becomes low at the upstream side of the crossflow, and the turbulent flow promoting effect becomes high at the downstream side of the crossflow.
9. The impingement cooling mechanism according to claim 1 , wherein the turbulent flow promoting portions are positioned between the first plurality of blocking members and the second plurality of blocking members.