The influence of area ratio to heat transfer characteristics of impingement-effusion double wall was investigated numerically

under the precondition of the same equivalent hole area.Results show that

with the decrease of area ratio of impinging hole to effusion hole

film flow velocity decreases

impinge cooling heat flux increases

and the cooling effectiveness enhances.The heat fluxes of hot side wall

cold side wall and effusion hole wall decrease with the area ratio

but the last one decreases least

and its quotient among the total heat flux increases.