Journal of Jilin University(Engineering and Technology Edition) ›› 2018, Vol. 48 ›› Issue (6): 1793-1798.doi: 10.13229/j.cnki.jdxbgxb20170699

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Optimization on thermal surface with rib turbulator inspired by turbulence of alopias' gill in simplified gas turbine transition piece

GUO Hao-tian1(),XU Tao1,LIANG Xiao1,YU Zheng-lei2(),LIU Huan1,MA Long1,3   

  1. 1. College of Mechanical Science and Engineering, Jilin University, Changchun 130022,China
    2. Key of Bionic Engineering,Ministry of Education, Jilin University, Changchun 130022,China
    3. College of Aviation Warfare Scervice,Aviation University of Air Force,Changchun 130022,China
  • Received:2017-07-05 Online:2018-11-20 Published:2018-12-11

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Abstract:

Based on flow characteristics around the gill of alopias, a bionic thermal surface with a rib turbulator was designed in a simplified gas turbine transition piece. The thermal performance of the heat transfer surface with a rib turbulator in a double-chamber model was investigated. The CFD simulation was carried out using software FLUENT to obtain the temperature contour and the velocity vector distribution on the thermal surface. The impinging cooling efficiency and the Nusselt number were computed also. The regression equation about the area weighted average temperature and the minimum pressure on the thermal surface was obtained by using a comprehensive experimental design and regression analysis method to study the effect of height and width of the turbulence generator. The optimal height and width of the ribbed turbulence generator were evaluated by the particle swarm optimization algorithm. The simulation results indicate that the bionic thermal surface can improve the convective heat transfer and the cooling efficiency of the double-chamber is improved by 340%.

Key words: engineering bionics, bionic thermal surface, numerical simulation, optimal design, rib turbulator

CLC Number: 

  • TB17

Fig.1

Gill morphological structure of Alopias"

Fig.2

Structure schematic of transition piece"

Fig.3

Two chamber model of transition piece with bionic surface"

Table 1

Parameters of transition piece in some kind of heavy-duty gas turbine"

类别 边界条件 数值
燃气
入口		 燃气流量/(kg·s-1)
入口温度/K
湍流强度/%
水力直径/m		 32.72
1300
5
0.324
燃气
出口		 出口压力/MPa
湍流强度/%
水力直径/m
对流换热系数/[W·(m2·K-1)]		 1.573
5
0.324
10
冷却
空气
腔室		 冷却空气温度/K
冷却空气压力/MPa
压力恢复系数
湍流强度/%
水力直径/m		 300
1.6558
0.98
10
0.01026

Table 2

Data of designed variables and responses"

序号 H/mm W/mm T/K P/Pa η/10-2 Nuˉ
1 5.13 5.13 1235.28 1 623 164.2 6.47 2146.82
2 5.13 10.26 1234.19 1 623 907.5 6.58 2400.93
3 5.13 15.39 1220.65 1 622 719.4 7.93 2441.41
4 5.13 20.52 1228.74 1 622 658.6 7.13 2205.34
5 10.26 5.13 1220.11 1 622 920.7 7.99 2408.47
6 10.26 10.26 1229.48 1 623 225.9 7.05 2194.11
7 10.26 15.39 1221.64 1 622 817.5 7.84 2295.77
8 10.26 20.52 1205.32 162 4361.8 9.47 3753.20
9 15.39 5.13 1199.92 1 623 140.9 10.01 3987.20
10 15.39 10.26 1190.40 1 624 660.5 10.96 4068.83
11 15.39 15.39 1212.31 1 624 927.0 8.77 2823.34
12 15.39 20.52 1198.00 1 624 995.1 10.20 3895.90
13 20.52 5.13 1154.73 1 625 081.6 14.53 4911.70
14 20.52 10.26 1207.83 1 623 267.7 9.22 3461.25
15 20.52 15.39 1184.81 1 624 841.9 11.52 4064.44
16 20.52 20.52 1183.00 1 624 720.4 11.7 3814.96

Fig.4

Comparison of temperature contours"

Table 3

Comparison of heat transfer on thermal surface"

Tmin/K T/K η
光滑换热表面 783 1262.68 3.73×10-2
仿生换热表面 575 1135.8 16.42×10-2

Fig.5

Comparison of flow streamlines in the coolant clamber"

Fig.6

Comparison of velocity vector in the coolant clamber"

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