Modification of the DRTA probes geometry for an environment with a high proportion of the radiant heat flux

Abstract

The Recovery Temperature Anemometry (RTA) is a method for determining the flow field velocity of a compressible fluid by measuring temperatures, in which the temperature rendered by temperature probes positioned within an airflow is determined by the thermodynamic temperature, the external flow velocity, the fluid's specific heat, and the probe's recovery factor. There is one drawback to employing a single temperature probe in the RTA approach. Even if the probe's recovery factor and isobaric heat capacity are known, the external flow velocity for the evaluation of the thermodynamic temperature or the thermodynamic temperature for the evaluation of the flow velocity must be known as well. The Double Probe Recovery Temperature Anemometry (DRTA) method, which uses two or more temperature probes with different recovery factors, has overcome this problem. The geometry of a previously proposed DRTA probe, which was originally sensitive to ambient heat radiation, was improved in this research. The qualities were improved by using a shield for both temperature sensors while maintaining their separate recovery factors. The alteration of the geometry of the original probe and experimental verification of its parameters are described in this paper.