Abstract
The measurement of gas temperatures in gas turbine engines has raised new problems, associated with high temperatures and high gas velocities, making necessary instruments which are free from radiation and conduction errors and insensitive to frictional heat effects in the gas flow. Errors due to these causes are discussed theoretically and an account is given of the experimental work that has been directed to reducing these errors to an acceptable order of magnitude. The thermocouple is the most suitable temperature-sensitive device to form the basis of these instruments, and the work has been directed to providing suitable radiation screening around the thermocouple elements with regulation of the gas velocity. The amount of screening and the gas velocity used in the instrument depend very much upon the circumstances of the measurement, i.e. the local conditions of gas density, radiation, etc. Although rules about the amount of screening necessary for particular measurements have been evolved, there is no general solution and each measurement must be considered on its merits. Suitable instruments are described for use in combustion chambers, compressors, jet pipes, etc.
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