A numerical study on various pin–fin shaped surface air–oil heat exchangers for an aero gas-turbine engine. (February 2016)

• Record Type: Journal Article
• Authors: Kim, Minsung; Ha, Man Yeong; Min, June Kee
• Is Part Of: International journal of heat and mass transfer. Volume 93(2016:Feb.)
• Page Start: 637
• Page End: 652
• Publication Date: 2016-02
• Subjects: Surface air–oil heat exchanger -- Aero gas-turbine engine -- Bypass effect; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2015.10.035
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: The performance of a surface air–oil heat exchanger is assessed numerically. Three types of pin–fin and plate-fin geometries are examined. The forward-slanted pin–fin shows accelerated flow near the bottom of the fin. Proposed pin–fin shows margin in the pressure drop performance. Detailed assessment using entropy generation is conducted. Abstract: In this study, the performance of a surface air–oil heat exchanger for an aero gas-turbine engine having plate- and pin–fin shaped geometries was investigated numerically. Basic heat-transfer and pressure-drop characteristics were examined using a simplified channel model. Performance of pin-shaped fins is compared with that of the plate fin as a baseline. Using a parametric study, optimal fin pitches of the pin–fin geometries in stream- and span-wise directions were determined. Finally, the high-speed bypass effect of the surface air–oil heat exchanger was calculated using the geometry of a real engine. Aero-thermal performance for such as the heat transfer rate, pressure-drop along the bypass stream of the engine, and distorted velocity boundary layer profiles, were evaluated quantitatively. The entropy generation rate due to the surface air–oil heat exchanger is summarized to assess the irreversibility loss inside the bypass stream and the cooler region.