An optimum design procedure of total-temperature thermocouple probe

The gas velocity in the sheath or the optimum internal flow velocity was determined on the principle that the Sun of the radiation error, the conduction error and the velocity error is a minimum under given operating conditions. After determining the optimum internal flow velocity, the diameter of the exhaust hole was determined and the layout of the probe was designed. The programming of the optimum design of total-temperature thermocouple probes, the formula for manually estimating the appropriate optimum internal flow velocity, and the design procedure are presented.