Abstract
The general problem of measuring the static temperature of gases flowing at high and low temperatures and at low and high velocities is reviewed. Thermodynamic methods are discussed and a new method is presented with experimental results. This proposed temperature-measuring method has several important and desirable features: (a) The calculated static temperature is practically independent of gas composition in so far as composition is characterized by the specific-heat ratio k; (b) like the thermocouple, the temperature determined by this method is a “point” value, not a mean value at the flow cross section where the measurements are made; (c) unlike the thermocouple, the method improves in accuracy as both the gas temperature and velocity are increased; and (d) the instrument required is relatively simple to build, is not subject to the effects of corrosion, and is extremely rugged when installed. The instrument requires no special handling and can be installed conveniently and easily in ducts of any shape or in a stream of unconfined gas.
