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AERO-THERMAL PERFORMANCE OF A NOZZLE VANE CASCADE WITH A GENERIC NON UNIFORM INLET FLOW CONDITION - PART II: INFLUENCE OF PURGE AND FILM COOLING INJECTION

[+] Author and Article Information
G. Barigozzi

Università degli Studi di Bergamo, Dipartimento di Ingegneria e Scienze Applicate Dalmine (BG) Italy
giovanna.barigozzi@unibg.it

H. Abdeh

Università degli Studi di Bergamo, Dipartimento di Ingegneria e Scienze Applicate Dalmine (BG) Italy
hamed.abdeh@unibg.it

A. Perdichizzi

Università degli Studi di Bergamo, Dipartimento di Ingegneria e Scienze Applicate Dalmine (BG) Italy
antonio.perdichizzi@unibg.it

M. Henze

Ansaldo Energia Switzerland AG Baden, Switzerland
marc.henze@ansaldoenergia.com

J. Krueckels

Ansaldo Energia Switzerland AG Baden, Switzerland
joerg.krueckels@ansaldoenergia.com

1Corresponding author.

ASME doi:10.1115/1.4036437 History: Received September 01, 2016; Revised March 24, 2017

Abstract

In the present paper, the influence of the presence of an inlet flow non uniformity on the aerodynamic and thermal performance of a film cooled linear nozzle vane cascade is fully assessed. Tests have been carried out with platform cooling, with coolant ejected through a slot located upstream of the leading edge. Cooling air is also ejected through a row of cylindrical holes located upstream of the slot, simulating a combustor cooling system. An obstruction was installed upstream of the cascade at variable tangential and axial position to generate a flow non uniformity. The cascade was tested at a high inlet turbulence intensity level (Tu1 = 9%) and at a constant inlet Mach number of 0.12 and nominal cooling condition. Aero-thermal characterization of vane platform was obtained through 5-hole probe and end wall adiabatic film cooling effectiveness measurements. Results show a relevant negative impact of inlet flow non uniformity on the cooled cascade aerodynamic and thermal performance. Higher film cooling effectiveness and lower aerodynamic losses are obtained when the inlet flow non uniformity is located at mid pitch, while lower effectiveness and higher losses are obtained when it is aligned to the vane leading edge. Moving the non uniformity axially or changing its blockage only marginally influences the platform thermal protection.

Copyright (c) 2017 by ASME
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