US 9,810,160 B2
Gas turbine temperature measurement
Wolfgang Lang, Lauchringen (DE); and Jürgen Hoffmann, Untersiggenthal (CH)
Assigned to ANSALDO ENERGIA SWITZERLAND AG, Baden (CH)
Filed by ALSTOM Technology Ltd, Baden (CH)
Filed on Nov. 25, 2013, as Appl. No. 14/88,494.
Claims priority of application No. 12194772 (EP), filed on Nov. 29, 2012.
Prior Publication US 2014/0144156 A1, May 29, 2014
Int. Cl. G01K 11/22 (2006.01); G01N 25/20 (2006.01); G01K 13/00 (2006.01); G01K 3/00 (2006.01); F02C 9/28 (2006.01); G01M 15/14 (2006.01); G01K 11/24 (2006.01); G01K 13/02 (2006.01); F02C 6/00 (2006.01)
CPC F02C 9/28 (2013.01) [F02C 6/003 (2013.01); G01K 11/24 (2013.01); G01K 13/02 (2013.01); G01M 15/14 (2013.01); F05D 2270/303 (2013.01); F05D 2270/80 (2013.01); G01K 2013/024 (2013.01); Y02E 20/14 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for determining a temperature in a pressurized flow path of a gas turbine downstream of a compressor and upstream of a turbine, comprising:
sending an acoustic signal from an acoustic signal emitting transducer arranged to send an acoustic signal across at least a section of a cross section of the pressurized flow path;
detecting the acoustic signal with a receiving transducer arranged to receive the acoustic signal after the acoustic signal crossed the section;
measuring the time needed by the acoustic signal to travel from the acoustic signal emitting transducer to the receiving transducer;
calculating the speed of sound based on the measured traveling time and distance between acoustic signal emitting transducer and the receiving transducer;
providing a heat capacity ratio (κ) and a specific gas constant (Rspec) of a gas flowing in the pressurized flow path; and
calculating the temperature of the gas in the section of the pressurized flow path as a function of the speed of sound, the heat capacity ratio (κ) and the specific gas constant (Rspec) of the gas flowing in the pressurized flow path, wherein a combustion pulsation pressure is measured over frequency, a maximum pulsation pressure is determined, and a frequency of the acoustic signal emitting transducer is tuned to a frequency, with a combustion pulsation pressure, which is less than 20% of the maximum pulsation pressure.