Numerical simulation on heat transfer and flow characteristics of three pin fin arrays with different solidity degrees are carried out by using SST k-ω turbulence model. According to the structure of the cooling gas flow field

the influence of solidity degree on heat transfer and pressure loss coefficient in the cooling channel was analyzed. The result shows that

with the increasing solidity degree of the pin fin arrays

the kinetic energy of the cooling flow reduces

and its own speed exhibits a periodic distribution. The area of the endwall becomes smaller

but the area ratio of the low temperature area with higher heat transfer efficiency increases. The average heat transfer level of the pin fin arrays with different solidity degrees increases exponentially with the inlet Reynolds number

the high solidity array has a higher heat transfer effect

and there are two highest points appear in the upper and lower flow direction. The pressure loss coefficient decreases exponentially in different solidity degrees

the high solidity pin fin arrays decreases faster

and the pressure loss coefficient at high Reynolds number is the lowest

the pressure loss coefficient of the flow decreases firstly and then increases.