Accession Number : AD0872174

Title :   Radiation Pyrometer for Gas Turbine Buckets.

Descriptive Note : Final rept. 24 Jan 69-10 Mar 70,

Corporate Author : SOLAR TURBINES INTERNATIONAL SAN DIEGO CA

Personal Author(s) : Duffy, Thomas E. ; Compton, W. A.

Report Date : JUN 1970

Pagination or Media Count : 168

Abstract : The report describes the results of a program that has demonstrated the practical feasibility of radiation pyrometry for gas turbines. Several sensor heads capable of interfacing with the severe environments of advanced turbojets were tested at sensor head temperatures of 1000F. Two basically different configurations of high environmental temperature sensor heads were used to identify target areas on blades and collect radiation from each blade as it passes across the optical axis. A remotely located silicon photovoltaic cell detected and converted the photons from each blade into electrical signals. High temperature fiber optics transmitted the radiation from the location of the sensor head on the turbine case to the relatively cool location of the detector. An electronic readout and control system measured and displayed in deg F the average temperature of all blades on a wheel, the average of the highest temperature of all blades on a wheel and the temperature of the hottest blade on a wheel. The digital display had a range of 1200 to 2200F and a response of five readings per second. An analog signal directly proportional to temperature was also available to demonstrate the applicability of the system for conventional engine fuel control systems. End-to-end system accuracy when calibrated with an electrically heated strip target was better than plus or minus 10 deg F across the range of 1200 to 2200F metal temperatures. Hundreds of hours of soot and thermal cycling tests performed on sensor heads to help establish the system's reliability. Proof pressure, vibration, temperature compensation, response, turbine simulator and full scale engine test results are also reported. (Author)

Descriptors :   *RADIATION PYROMETERS), (*GAS TURBINE BLADES, GAS TURBINES, TURBOJET ENGINES, FEASIBILITY STUDIES.

Subject Categories : Test Facilities, Equipment and Methods
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE