INSTRUMENTATION DEVELOPMENT AND INVESTIGATION OF PULSATING JET ENGINE CYCLE
Progress rept. no. 16, 1-30 Jun 1948
AEROJET ENGINEERING CORP AZUSA CA
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Work was renewed on the development of the lead sulfide probe for use in the measurement of temperature of pulsejet gases. A new probe, much smaller than the original experimental model, is being built. The end of this new probe will be closed by a filter glass or fused quartz disc so that radiation is received from a gaseous path of definite length. Jacketing is provided for liquid cooling, not only of the shell, but also of the glass filters at the end of the probe. Absorption tests that have been run on carbon tetrachloride indicate that this material is useful as a liquid cooling agent. A telescoping type of shutter is provided, which, when operated by a linear actuator, will make possible exposures of short duration. It is possible that liquid cooling of the filter glasses may not be necessary when this extensible shutter is used. Pictures and tests of this device will be presented in a future report. Work was also started on test equipment to check the validity of the use of radiation in the 2.7 and 4.26 micron bands of carbon dioxide for the measurement of temperature of pulsejet gases. The variation of spectral emissivity with pressure, temperature, and path length must be determined with some certainty. An infrared spectrometer is available for these purposes, and a cell is being developed, which will hold the carbon dioxide gas, and which can be mounted in the optical path of the spectrometer through a periscope.
- Jet and Gas Turbine Engines