...Rui Zhu; Huaitao Zhu; Gongnan Xie Based on a combined-hole design, a novel hole arrangement was proposed and tested on a flat plate model by numerical simulation. Replacing one row in two rows of staggered holes with a row of smaller holes, the bigger holes in one row and smaller holes in the other...

... analyzed in the past decades [ 9–11 ]. The results showed that shaped-hole and CA gave higher film cooling effectiveness compared to round-hole. However, complex shaped-holes bring manufacture problems and higher costs. Meanwhile, some studies that focused on combined-hole based on round-hole have also...