Heat transfer investigation in new cooling schemes of a stationary blade trailing edge

被引：14
|
作者：
Beniaiche, A. [1 ,2 ]
Ghenaiet, A. [3 ]
Carcasci, C. [4 ]
Facchini, B. [4 ]
机构：
[1] Univ Mhamed BOUGARA, Fac Engn, Energy Mech & Engn Lab LEMI, Boumerdes, Algeria
[2] Ecole Mil Polytech, Lab Thermal Power Syst, Bordj El Bahri 16046, Alger, Algeria
[3] Univ Sci & Technol Houari Boumediene, Fac Mech & Proc Engn, Algiers 16111, Algeria
[4] Univ Florence, DIEF Dept Ind Engn, Florence, Italy
来源：
APPLIED THERMAL ENGINEERING | 2015年 / 87卷
关键词：
TLC technique; Stationary gas turbine blade; Trailing edge cooling schemes; Ribs; Pedestals; Heat transfer coefficient; Nusselt number; PRESSURE; CHANNEL;
D O I：
10.1016/j.applthermaleng.2015.05.001
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
This paper describes an experimental study for a 30:1 scaled model reproducing an innovative wedge shaped discharge trailing edge (TE) cooling scheme. Three configurations were investigated: Smooth, Ribs +60 degrees and Ribs -60 degrees with both closed and open tip. Thermochromic Liquid Cristal TLC technique was used to measure the heat transfer coefficient, for a Reynolds number between 10,000 and 40,000 in the stationary condition. The results reveal a direct effect of the Reynolds number and the configurations of cooling scheme on the heat transfer coefficient. Cooling efficiency is influenced by the ribs, the tip configuration and the flow regime. The average Nusselt number at the inlet duct region L0 and the exit trailing edge L1 region is correlated firstly based only on the Reynolds number and secondly on the Reynolds number, Prandtl number and a fraction of blade height. The derived Correlations may serve in assessing the effectiveness of blades TE cooling systems. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：816 / 825
页数：10
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