Heat Transfer Enhancement for Turbine Blade Internal Cooling

Wright, Lesley M.; Han, Je-Chin

doi:10.1615/jenhheattransf.2015012169

Cited by 27 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Han et al [10][11][12][13] performed detailed studies of typical impingement jets, rib turbulators, dimples, and novel internal cooling structures. In 2014, Wright et al 14 summarized the internal cooling results of the past decade and introduced new cooling design concepts.…”

Section: Abbreviationsmentioning

confidence: 99%

Conjugate heat transfer study of various cooling structures and sensitivity analysis of overall cooling effectiveness

Liu

You

et al. 2022

Sci Rep

View full text Add to dashboard Cite

The conjugate heat transfer of a turbine blade is influenced by several factors. To analyze the influence of each factor, the published one-dimensional conjugate heat transfer model was improved through theoretical analysis in this study. An overall cooling effectiveness equation containing three dimensionless parameters (adiabatic film cooling effectiveness η, Biot number on the mainstream side Big, and ratio between the heat transfer coefficients of the external and internal walls hg/hi) was obtained. The sensitivity of the overall cooling effectiveness ϕ to these three parameters was obtained through a multi-parameter sensitivity analysis. The results showed that increasing η could improve ϕ the most effectively. The interactions between the dimensionless parameters were analyzed by developing sensitivity charts. The results showed that increasing η from 0.4 to 0.5 could reduce the sensitivity of ϕ to the other two parameters by approximately 15%, whereas increasing Big had little effect on the sensitivity of ϕ to each dimensionless parameter. Increasing hg/hi could improve the sensitivity to η. The above conclusions could also be applied to the plate film hole and plate impingement effusion structures. The effects of different internal cooling structures and film hole structures on the three dimensionless parameters were studied by performing numerical simulations, which verified the accuracy of the one-dimensional conjugate heat transfer model in this study. The results showed that the internal cooling structures had little effect on the distribution of η and Big. The heat transfer coefficient on the coolant side could be effectively improved by installing film holes. The film hole structures mainly affected ϕ by influencing the distribution of η.

show abstract

Section: Abbreviationsmentioning

confidence: 99%

Conjugate heat transfer study of various cooling structures and sensitivity analysis of overall cooling effectiveness

Liu

You

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Because multiple stationary and rotating components with unique airfoil counts operate together within the engine, harmonic mechanical and heat transfer mechanisms (often in excess of 35 kHz [1]) can fatigue hot, highly-stressed turbine blades that operate on a tight thermal margin [2,3] and, for that reason, accurate time-resolved models are needed. However, such modeling is computationally intensive and often neglects upstream and downstream component interaction, which causes additional undesired harmonic behaviors [2,4].…”

Section: Introductionmentioning

confidence: 99%

Development of coated heat flux gauges for fast responding measurements

Siroka¹,

Berdanier²,

Thole³

2022

Meas. Sci. Technol.

View full text Add to dashboard Cite

Thermal systems often exhibit transient behaviors that have important implications for the operation of the system and can be difficult to predict. For these reasons, experimental testing is often required to ensure system durability requirements are achieved. One important parameter governing the survivability of components in hot, high-stress environments is the heat flux into the part that dictates the temperature distribution for the component. However, sensors required to experimentally characterize heat fluxes in extreme environments must also be resilient. This study presents the development of coated heat transfer gauges capable of robust, high-frequency measurements in turbine research facilities. The addition of a protective coating increases the durability of the gauge, but inherent of that coating is the attenuation of high-frequency temperature penetrations. As a result, this study first outlines the use of analytical solutions to define a gauge design for a specific frequency range and heat transfer, ensuring that subsurface signals can be rectified to surface conditions through inverse methods. Then, the fabrication of polyimide substrate sensors with a parylene-F coating is described. Micro surface heaters added to the custom sensors were used to determine important geometric and thermal properties necessary to calculate accurate surface heat flux. Ultimately, this work shows increased sensor robustness in a turbine test bed and experimentally validates that the frequency response of the fabricated sensors meet the design intent.

show abstract

“…The journal was first published in 1994 and has a wealth of archival papers on many aspects of enhanced or high-performance heat and mass transfer. Some excellent review articles published recently in this journal included heat transfer enhancement for turbine blade internal cooling (Wright and Han, 2014), heat exchangers (Zimparov et al, 2016;Thome, 2017a;Samokhvalov et al, 2018), heat pipes (Cao and Faghri, 2017), horizontal tube falling film and flooded evaporators (Balaji et al, 2018), solar air heaters (Sahu and Prasad, 2016), boiling and evaporation (Tong et al, 2017;Shatto and Peterson, 2017;Thome, 2017b), extended surfaces and rough surfaces (Shome and Jensen, 2017;Taylor and Hodge, 2017;Chamra and Webb, 2017), and a brief review of 2018 literature on enhanced heat transfer (Guo, 2019), to name a few.…”

Section: Introductionmentioning

confidence: 99%

A Review on Heat Transfer Enhancement With Nanofluids

Guo

2020

J Enh Heat Transf

View full text Add to dashboard Cite

Advances in technology miniaturization with increasing power density call for new technologies for enhancing heat transfer. Enhancement of heat transfer with the use of nanofluids has been a hectic topic of research and development since the term "nanofluid" was first used in 1995, mainly because the thermophysical properties of nanofluids in most reports in the literature showed supremacy or improvement over their base fluids, which may not allow fulfillment of the present cutting-edge technology needs. Significant progress in this field has been made in the past two decades. This review summarizes a variety of the experimentally measured thermal properties of common nanofluids, the enhancement mechanisms discovered or hypothesised, the models used for properties and heat transfer characteristics, and the applications of nanofluids for enhancing heat transfer. The model of an artificial neutral network is particularly emphasized. Applications to cooling technology, renewable energy and energy systems, and building technology are detailed. Challenges and areas for future research are identified.

show abstract

Heat Transfer Enhancement for Turbine Blade Internal Cooling

Cited by 27 publications

References 0 publications

Conjugate heat transfer study of various cooling structures and sensitivity analysis of overall cooling effectiveness

Conjugate heat transfer study of various cooling structures and sensitivity analysis of overall cooling effectiveness

Development of coated heat flux gauges for fast responding measurements

A Review on Heat Transfer Enhancement With Nanofluids

Contact Info

Product

Resources

About