Research on the Development and Evaluation of a Two-Sensor Enthalpy Probe

摘要

The applicability of measuring plasma enthalpies with an immersion probe using two miniature heat flux transucers is investigated both analytically and experimentally. The transducers considered were 0.006 in. OD internally cooled insulating tubes with a platinum resistive film on the surface. The two-sensor technique involves making heat flux measurements to two identical bodies operating at different surface temperatures. The problem of survival in the plasma environment and the accuracy requirements for two-sensor measurements are investigated. Miniature sensor supports are tested in an Argon plasma. A heat flux traverse of an oxygen-acetylene torch with a sensor is presented, along with some two-sensor measurements in environments under 1,600F. An analytical error analysis of the two-sensor technique is presented to identify the accuracy needed for accurate enthalpy measurements. (Author)