A theoretical analysis and experimental study of flow and heat transfer in a transpiration cooled passage

A theoretical analysis of the coolant flow and heat transfer in the passage for a transpiration-cooled blade was made and several mathematical expressions were derived. Various factors influencing thermal parameters in the passage are also considered. Experimental results indicate that: (1) the flow near metering orifice is not one-dimensional then it is quite important to take a correction in calculation; (2), it is not appropriate to account for the heat transfer between the coolant and the porous shell to choice about 5 times size of the heat transfer coefficient in the turbulence tube. It is shown that several mathematical expressions are ready for whole heat transfer design of blades and the experimental datum are provided for the same type transpiration-cooled blade design.