This paper investigated the influence of the width of detached space on the thermal performance and flow resistance in a cooling channel over the Reynolds number range from 8 200 to 52 500. The threedimensional steadystate simulation was conducted to investigate heat transfer and pressure loss characteristics of detached pin fin arrays with different widths in cooling channels. The numerical results are tested by three grid strategies, and the numerical method was validated by experimental data. Numerical results show that in the researched Re number range, the width of detached pin fin has a great influence on the cooling ability while the width of the detached pin fin has an optimal value to make the best cooling performance.

Key words： detached pin fin; turbine blade cooling; width of pin fin; flow and heat transfer