Effect of porosity and injection ratio on the performance of transpiration cooling through gyroids

Benjamin J. Brimacombe; James A. Scobie; Joseph Flynn; Carl M. Sangan; Oliver J. Pountney

doi:10.3390/ijtpp8040050

Effect of porosity and injection ratio on the performance of transpiration cooling through gyroids

Benjamin J. Brimacombe, James A. Scobie, Joseph Flynn, Carl M. Sangan, Oliver J. Pountney

Research output: Contribution to journal › Article › peer-review

Abstract

This paper presents experimental measurements of adiabatic effectiveness for three transpiration cooling porosities ( (Formula presented.) 0.3, 0.4, and 0.5) constructed from gyroid lattice structures. To the authors’ knowledge, this is the first use of a Triply Periodic Minimal Surface (TPMS) function to produce transpiration test coupons of varying porosity. Polymer gyroid lattice structures were successfully printed using Stereolithography (SLA) down to (Formula presented.) 0.3 for a print resolution of 25 microns and unit cell size of 2 mm. Cooling performance was measured in a small-scale wind tunnel. High-resolution Infrared Thermography was used to determine wall temperatures downstream of the porous section. When tested at both common blowing ratios ( (Formula presented.) = 0.029, 0.048, and 0.062) and common injection ratios ( (Formula presented.) = 0.010, 0.017, and 0.022) the cooling performance was found to be dependent on porosity for constant (Formula presented.) but not for constant (Formula presented.). Having determined (Formula presented.) as the more important parameter for comparison, results are presented alongside transpiration and effusion data from literature.

Original language	English
Article number	50
Number of pages	12
Journal	International Journal of Turbomachinery Propulsion and Power
Volume	8
Issue number	4
DOIs	https://doi.org/10.3390/ijtpp8040050
Publication status	Published - 1 Dec 2023

Bibliographical note

Funding:
Engineering and Physical Sciences Research Council (Grant No. EP/R021279/1; Funder ID: 10.13039/501100000266).

Data Availability Statement:
Data are contained within the article. Additional data are available on request from the corresponding author.

Funding

This research was funded by the Engineering and Physical Sciences Research Council (Grant No. EP/R021279/1; Funder ID: 10.13039/501100000266).

Funders	Funder number
Engineering and Physical Sciences Research Council	EP/R021279/1

Keywords

additive manufacturing
effective area
gyroids
injection ratio
periodic porous structures
transpiration cooling

ASJC Scopus subject areas

Mechanical Engineering
Aerospace Engineering
Energy Engineering and Power Technology

Access to Document

10.3390/ijtpp8040050Licence: CC BY

Cite this

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title = "Effect of porosity and injection ratio on the performance of transpiration cooling through gyroids",

abstract = "This paper presents experimental measurements of adiabatic effectiveness for three transpiration cooling porosities ( (Formula presented.) 0.3, 0.4, and 0.5) constructed from gyroid lattice structures. To the authors{\textquoteright} knowledge, this is the first use of a Triply Periodic Minimal Surface (TPMS) function to produce transpiration test coupons of varying porosity. Polymer gyroid lattice structures were successfully printed using Stereolithography (SLA) down to (Formula presented.) 0.3 for a print resolution of 25 microns and unit cell size of 2 mm. Cooling performance was measured in a small-scale wind tunnel. High-resolution Infrared Thermography was used to determine wall temperatures downstream of the porous section. When tested at both common blowing ratios ( (Formula presented.) = 0.029, 0.048, and 0.062) and common injection ratios ( (Formula presented.) = 0.010, 0.017, and 0.022) the cooling performance was found to be dependent on porosity for constant (Formula presented.) but not for constant (Formula presented.). Having determined (Formula presented.) as the more important parameter for comparison, results are presented alongside transpiration and effusion data from literature.",

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AU - Flynn, Joseph

AU - Sangan, Carl M.

AU - Pountney, Oliver J.

N1 - Funding: Engineering and Physical Sciences Research Council (Grant No. EP/R021279/1; Funder ID: 10.13039/501100000266). Data Availability Statement: Data are contained within the article. Additional data are available on request from the corresponding author.

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Effect of porosity and injection ratio on the performance of transpiration cooling through gyroids

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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An investigation into combined film and internal cooling of turbine blades

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Effect of porosity and injection ratio on the performance of transpiration cooling through gyroids

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Projects

An investigation into combined film and internal cooling of turbine blades

Cite this