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research-article

TRANSPORT OF ENTROPY WAVES WITHIN A HP TURBINE STAGE

[+] Author and Article Information
Paolo Gaetani

Politecnico di Milano, Dipartimento di Energia, Laboratorio di Fluidodinamica delle Macchine, www.lfm.polimi.it, Via Lambruschini, 4, 20158, Milano, Italy
paolo.gaetani@polimi.it

Giacomo Persico

Politecnico di Milano, Dipartimento di Energia, Laboratorio di Fluidodinamica delle Macchine, www.lfm.polimi.it, Via Lambruschini, 4, 20158, Milano, Italy
giacomo.persico@polimi.it

1Corresponding author.

ASME doi:10.1115/1.4042165 History: Received September 19, 2018; Revised November 29, 2018

Abstract

This paper presents the results of an experimental study on the transport of entropy waves, representative of those generated by gas turbine burners, within an un-cooled high-pressure gas turbine stage. The prescribed entropy waves were injected in streamwise direction featuring a 7% over-temperature with respect to the main flow at the stage inlet, with a frequency of 30 Hz. The entropy waves are injected in four different circumferential positions with respect to the stator blade. Detailed time-resolved temperature measurements as well as aerodynamic measurements upstream and downstream of the blade rows were performed. Measurements showed a relevant attenuation of the entropy waves throughout their transport within the stator blade row. The temperature distribution resulted in a severe alteration depending on the injection position. Downstream of the rotor, the waves spread over the pitch above midspan and are more concentrated at the hub. Finally, a comparison with measurements performed with conventional steady hot streaks is also reported, remarking both differences and affinities. As a relevant conclusion, it is experimentally shown that entropy waves can be proficiently simulated by considering a number of hot streaks of different amplitude.

Copyright (c) 2018 by ASME
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