Recent studies have demonstrated that cylindrical hole with backward injection arrangement, of which the jets are injected reverse to the mainstream flow direction, outperforms its forward injection counterpart, of which the jets are injected along the flow direction, at high blowing ratio, since the jet starts to lift off typically for forward injection when blowing ratio is greater than 1.0. However, the backward injection configuration features a large separation and induces high heat transfer near the hole. Relative few studies have been conducted to mitigated the drawbacks of backward injection arrangements. The present study investigated several flat plate trenched hole arrangements with backward injection. Experiments were conducted in a low speed suction type wind tunnel. The trench width was varied from 2d to 4d for the backward arrangements with fixed trench depth of 0.75d. Besides, a simple backward and a trenched hole with forward injection, whose width is 2d and depth is 0.75d, were also studied as references. Transient thermal measurements were carried out for all the arrangements with IR camera. Detailed distributions of heat transfer coefficient were obtained. For each case, blowing ratio was varied from 0.25 to 4.0, while the density ratio was almost unity. Effects of injection angle, trench width and blowing ratio on the surface heat transfer distributions were obtained, and the results are presented and explained in this investigation.
Skip Nav Destination
ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
June 11–15, 2018
Oslo, Norway
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5110-4
PROCEEDINGS PAPER
High Resolution Heat Transfer Measurements of Cylindrical Holes Embedded in a Trench With Backward Injection
Xueying Li,
Xueying Li
Tsinghua University, Beijing, China
Search for other works by this author on:
Hongde Jiang
Hongde Jiang
Tsinghua University, Beijing, China
Search for other works by this author on:
Bo Shi
Tsinghua University, Beijing, China
Xueying Li
Tsinghua University, Beijing, China
Jing Ren
Tsinghua University, Beijing, China
Hongde Jiang
Tsinghua University, Beijing, China
Paper No:
GT2018-76676, V05CT19A029; 10 pages
Published Online:
August 30, 2018
Citation
Shi, B, Li, X, Ren, J, & Jiang, H. "High Resolution Heat Transfer Measurements of Cylindrical Holes Embedded in a Trench With Backward Injection." Proceedings of the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. Volume 5C: Heat Transfer. Oslo, Norway. June 11–15, 2018. V05CT19A029. ASME. https://doi.org/10.1115/GT2018-76676
Download citation file:
39
Views
Related Proceedings Papers
Related Articles
Wind-Related Heat Transfer Coefficient for Flat-Plate Solar Collectors
J. Sol. Energy Eng (May,1987)
Unsteady Interaction Effects on a Transitional Turbine Blade Boundary Layer
J. Turbomach (April,1989)
A
Periodic-Transient Method for High-Resolution Heat Transfer Measurement on Two-Dimensional Curved
Surfaces
J. Heat Transfer (December,2007)
Related Chapters
The Design and Implement of Remote Inclinometer for Power Towers Based on MXA2500G/GSM
International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3
Efficient Transmission Images with QAM Modulation over an AWGN Channel
International Conference on Computer and Electrical Engineering 4th (ICCEE 2011)
Role of Surface Analysis
Micro and Nanotribology