A comparative study on showerhead cooling performance

Falcoz, C.; Ott, Peter

doi:10.1016/j.ijheatmasstransfer.2005.10.013

Cited by 10 publications

(11 citation statements)

References 7 publications

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“…In-hole convection has been shown in literature to contribute to a significant portion of the cooling effectiveness [25,26]. As much as 30-50% of the total heat absorbed by the cooling flow has been attributed to the flow passing through the holes in different types of film cooling configurations.…”

Section: Resultsmentioning

confidence: 99%

Effectiveness Measurements of Additively Manufactured Film Cooling Holes

Stimpson

Snyder

Thole

et al. 2017

Journal of Turbomachinery

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As additive manufacturing (AM) technologies utilizing metal powders continue to mature, the usage of AM parts in gas turbine engines will increase. Current metal AM technologies produce parts with substantial surface roughness that can only be removed from external surfaces and internal surfaces that are accessible for smoothing. Difficulties arise in making smooth the surfaces of small internal channels, which means the augmentation of pressure loss and heat transfer due to roughness must be accounted for in the design. As gas turbine manufacturers have only recently adopted metal AM technologies, much remains to be examined before the full impacts of applying AM to turbine parts are understood. Although discrete film cooling holes have been extensively studied for decades, this objective of this study was to understand how the roughness of film cooling holes made using AM can affect the overall cooling effectiveness. Coupons made from a high temperature nickel alloy with engine-scale film holes were tested in a rig designed to simulate engine relevant conditions. Two different hole sizes and two different build directions were examined at various blowing ratios. Results showed that the effectiveness is dependent on the build direction and the relative size of the hole. It was also discovered that commercially available AM processes could not reliably produce small holes with predictable behavior.

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Section: Resultsmentioning

confidence: 99%

Effectiveness Measurements of Additively Manufactured Film Cooling Holes

Stimpson

Snyder

Thole

et al. 2017

Journal of Turbomachinery

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“…In their investigation, Hay and Lampard [19] had already reported that conically flared holes show higher CD values than cylindrical holes, provided that the cylindrical inlet to the flare was sufficiently long (two hole diameters at least), which was the case for the present tests. For a more detailed discussion of the CD values, the reader is referred to [16]. The film cooling effectiveness and non-dimensional heat transfer coefficient were evaluated along the surface with the transient liquid crystal technique.…”

Section: Results With Film Coolingmentioning

confidence: 99%

“…The reader is referred to [15,16] for a more detailed explanation of this measurement method. The heat transfer coefficient is presented mostly in dimensionless form by…”

Section: Measurement Technique and Data Reductionmentioning

confidence: 99%

“…In order to evaluate the performance of showerhead cooling schemes, all three aspects of showerhead cooling have to be addressed. This is the aim of the present and a companion paper [18]. The present paper investigates the external film cooling aspects alone, whereas the companion paper [18] shows the evaluation of the global performance of the showerhead cooling model by using 2D and 3D finite element models (FEM).…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigations on showerhead cooling on a blunt body

Falcoz¹,

Ott²

2006

International Journal of Heat and Mass Transfer

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In modern gas turbines, the turbine airfoil leading edge is currently protected from the hot gases by specific film cooling schemes, socalled showerhead cooling. The present paper shows an experimental study of different showerhead cooling geometries on a blunt body. For these tests, TLC (thermochromatic liquid crystals) have been used for measuring the film cooling performance and the heat transfer. Detailed experimental results for the aerodynamics, the film cooling effectiveness and the heat transfer enhancement are presented for different film cooling geometries.

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“…The deterioration of film cooling effectiveness due to an unsteady wake in the leading edge region was studied (using a spoke wheel) by Funazaki et al (1997) and Heidmann et al (2001). The use of shaped holes to improve film coverage has been studied by Reiss and Bölcs (2000), Falcoz et al (2006) and Gao and Han (2009).…”

Section: Leading Edge Film Coolingmentioning

confidence: 99%

Turbine Blade Film Cooling Using PSP Technique

Han¹,

Rallabandi²

2010

Frontiers in Heat and Mass Transfer

192

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Film cooling is widely used to protect modern gas turbine blades and vanes from the ever increasing inlet temperatures. Film cooling involves a very complex turbulent flow-field, the characterization of which is necessary for reliable and economical design. Several experimental studies have focused on gas turbine blade, vane and end-wall film cooling over the past few decades. Measurements of heat transfer coefficients, film cooling effectiveness values and heat flux ratios using several different experimental methods have been reported. The emphasis of this current review is on the Pressure Sensitive Paint (PSP) mass transfer analogy to determine the film cooling effectiveness. The theoretical basis of the method is presented in detail. Important results in the open literature obtained using the PSP method are presented, discussing parametric effects of blowing ratio, momentum ratio, density ratio, hole shape, surface geometry, free-stream turbulence on flat plates, turbine blades, vanes and end-walls. The PSP method provides very high resolution contours of film cooling effectiveness, without being subject to the conduction error in high thermal gradient regions near the hole.

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A comparative study on showerhead cooling performance

Cited by 10 publications

References 7 publications

Effectiveness Measurements of Additively Manufactured Film Cooling Holes

Effectiveness Measurements of Additively Manufactured Film Cooling Holes

Experimental investigations on showerhead cooling on a blunt body

Turbine Blade Film Cooling Using PSP Technique

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