Conjugate Heat Transfer Measurements and Predictions of a Blade Endwall With a Thermal Barrier Coating

Mensch, Amy; Thole, Karen A.; Craven, Brent A.

doi:10.1115/1.4028233

Cited by 38 publications

(20 citation statements)

References 38 publications

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“…3, which shows the seven blade, six passage linear cascade. The blade geometry used was a generic airfoil common in the literature [1,2,22,24,[28][29][30][31][32][33][34][35][36]. The conducting portion of the endwall is shown in green.…”

Section: Experimental Methods and Uncertaintymentioning

confidence: 99%

“…The overall thermal performance of a turbine endwall geometry with impingement and film cooling was investigated by Mensch et al [1,2] with matched Bi experiments and simulations. The external heat transfer for an endwall differs from that of a flat plate, leading edge or airfoil surface, due to the influence of passage secondary flows including the horseshoe and passage vortices.…”

Section: Relevant Literaturementioning

confidence: 99%

“…The distribution of the external endwall heat transfer coefficients for the airfoil geometry in this study was investigated by Lynch et al [22] through both experiments and computational predictions with a constant wall heat flux boundary condition. For the conjugate endwall studies [1,2], the endwall was cooled with the same cooling features as the current study. Results indicated that the internal impingement cooling had a greater influence than film cooling on the scaled endwall temperatures.…”

Section: Relevant Literaturementioning

confidence: 99%

“…Just as the external wall temperature, T w , is non-dimensionalized as , the data for T w,i can be non-dimensionalized by the mainstream and coolant temperatures to define an internal overall effectiveness, as shown in Eq. (2).…”

Section: Fig 1 Important Parameters and Temperatures Of The Conjugamentioning

confidence: 99%

“…As will be discussed in the following sections, recent experiments and simulations have begun to investigate conjugate heat transfer effects to provide scaled metal temperatures. This study focus on the conjugate heat transfer results due to variations in the internal impingement cooling geometry, building upon the results for a blade endwall with impingement and film cooling by Mensch et al [1,2]. Conjugate experiments and computational simulations are used to examine the influence of internal impingement cooling geometry on wall temperatures and internal heat transfer coefficients.…”

Section: Introductionmentioning

confidence: 99%

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Conjugate heat transfer analysis of the effects of impingement channel height for a turbine blade endwall

Mensch

Thole

2015

International Journal of Heat and Mass Transfer

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Advancements in cooling for applications such as gas turbines components require improved understanding of the complex heat transfer mechanisms and the interactions between those mechanisms. Critical cooling applications often rely on multiple thermal protection techniques, including internal cooling and external film cooling in gas turbine airfoils, to efficiently cool components and limit the use of coolant. Most research to quantify the effectiveness of such cooling technologies for gas turbine applications has isolated internal and external cooling in separate experiments. The research presented in this paper uses a conjugate heat transfer approach to account for the combined effects of both internal and external cooling. The geometry used for this study is a turbine blade endwall that includes impingement and film cooling as well as the relevant conduction through the endwall. Appropriate geometric and flow parameters were scaled to ensure engine relevant dimensionless temperatures were obtained. Using the conjugate heat transfer approach, the effect of varying the height of the impingement channel was examined using spatially resolved external wall temperatures obtained from both experiments and simulations. A one-dimensional heat transfer analysis was used to derive the average internal heat transfer coefficients from the experimental results. Both experiments and simulations showed good agreement between area averaged cooling effectiveness and impingement heat transfer coefficients. The cooling effectiveness and heat transfer coefficients peaked for an impingement channel height of around three impingement hole diameters. However, the heat transfer coefficients were more sensitive than the overall effectiveness to the changes in height of the impingement channel.

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