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QUESTION 19 5 High-pressure turbine vanes tend to be air cooled in modern turbofans. This question investigates the potential maximum temperature that these blades may reach if cooling fails. The outer surface of a turbine vane is exposed to combustion products of Prandtl number Pr = 0.80, constant pressure specific heat capacity Cp = 1106 J-kg-4k-1. and static temperature T5 = 1231 K, approaching the blade with relative velocity C1 = 189 m-5-1 A turbulent boundary layer forms over the blade surface. Estimate the adiabatic surface temperature Tawt, without active cooling. State your answer in degrees Kelvin to zero decimal places and enter the numerical value only. Partial credit is awarded for a reasonable approximation to the correct numerical answer.