Miniature Probes for Use in Gas Turbine Testing

An Experimental Determination of Losses in a 3-Port Wave Rotor

“…There were 5 static pressure taps on the top and bottom of each port, and four pitot tube installations. The pitot installations carried either a rake of 5 pitot tubes to determine radial velocity distribution, or a tube-type combination probe (Glawe and Krause, 1974), to determine center-line velocity and direction. In the high pressure port, velocities are low, and relatively uniform, and an average of the individual port stagnation pressure measurements was taken as the port stagnation pressure.…”

Instrumentation for Propulsion Systems Development

“…When the probe is thus mechanically aligned with the flow, the mean pressure on the wedge surfaces almost represents the static pressure (there is a significant correction for the magnitude of flow velocity) so that flow speed, as well as direction, is deducible, though not always with high accuracy. Detailed dimensions and Lo--,-acteristics of probes of this type are given in (1) and (2). * Calibrated thermocouple probes -The indication of a thermocouple probe intended to measure total or static gas temperature often 'Numbers in parentheses cesignate References at end of paper.…”

Experimental Aerothermal Performance of Turbofan Bypass Flow Heat Exchangers

“…In the present investigation numerical simulations were performed to study the steady and unsteady heat balances within a temperature probe and to evaluate both the temperature field during a transient and at equilibrium conditions. Multiple attempts to provide correction factors for standard thermocouple designs were found in the literature [79][80][81][82][83]. The experimental evaluation of the time response has been a continuous subject of interest in which both internal and external heating techniques have been applied.…”

“…General design rules reported in the literature, [94,95], as well as design recommendations for particular applications based on comparative analysis of different probe configurations [79,80,96,97], provide the basis to reduce the temperature error sources on new designs. A shield is recommended in order to decrease the error caused by the transformation of kinetic energy into thermal energy in the boundary layer around the junction (often called velocity error).…”

“…The junction position within the shield is a compromise between entrance flow effects, radiation shielding and convective heat transfer between the thermocouple and the shield. Recommended values are given by Rom and Kronzon [80] and Glawe et al [79]. The wires within the shield can be placed parallel or perpendicular to the flow.…”