Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (5): 64-69.doi: 10.6040/j.issn.1672-3961.0.2020.093

• Electrical Engineering • Previous Articles     Next Articles

Optimization of the inner deflector of the shrimp-waist elbow

Jinsheng QI1(),Hongzhen CAO1,Yan SHI2,Wenjing DU2,Zhan WANG2,*()   

  1. 1. Shandong Electric Power Engineering Consulting Institute Corporation, Jinan 250013, Shandong, China
    2. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2020-04-08 Online:2020-10-20 Published:2020-10-19
  • Contact: Zhan WANG E-mail:qijinsheng@sdepci.com;wangzhan@sdu.edu.cn

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Abstract:

In order to study the distribution of the flow field and improve the uniformity of the flow field in a shrimp-waist bend, a series of three-dimensional numerical simulation studies on the turbulent secondary flow in a bend before and after the installation of the deflector was carried out by using the Realizable k-ε model. The results showed that when the deflector was not arranged in the shrimp-waist bend pipe, a large range of low-speed zones appeared in the horizontal straight pipe section after the fluid turns, and a backflow phenomenon occured at the same time. The airflow distribution was extremely uneven and the pressure resistance was large. After the deflector was arranged, the flow characteristics of the fluid in the elbow were effectively improved and the energy loss of the system was reduced. Based on the analysis of the influence of different number, structure and arrangement of deflectors on the uniformity of flow field and pressure drop loss of the bend, the optimal arrangement of deflectors in the shrimp-waist bend was proposed as follows: the number of deflectors was 3, the deflectors′ center angle was 60°, and the deflectors were all arranged backward.

Key words: elbow, flow field optimization, resistance loss, deflector, numerical simulation

CLC Number: 

  • TB126

Fig.1

Geometry model of elbow"

Fig.2

Validation of solver and turbulence model"

Fig.3

Independence analysis of grid number"

Fig.4

Pressure distribution in the central section of bend"

Fig.5

Velocity distribution and streamline diagram in the center section of bend"

Fig.6

Cv of different number of deflector models at the reference section"

Fig.7

Total resistance loss for different number of deflector models"

Fig.8

Pressure distribution of the elbow after the deflectors arranged"

Fig.9

Velocity distribution and streamline diagram of the elbow after the deflectors arranged"

Fig.10

Variation of flow field uniformity with θ"

Fig.11

Variation of total resistance loss with θ"

Fig.12

Cv at different starting and ending positions"

Fig.13

Velocity distribution and streamline diagram of different models of start and stop position of deflectors(θ=60°)"

1 STUDENT O Z , SVIRS′KA L M , Dzioba I R . Influence of the long-term operation of 12Kh1M1F steel from different zones of a bend of steam pipeline of a thermal power plant on its mechanical characteristics[J]. Materials Science, 2012, 48 (2): 239- 246.
doi: 10.1007/s11003-012-9498-6
2 KUAN B , YANG W , SCHWARZ M P . Dilute gas-solid two-phase flows in a curved duct bend: CFD simulation with experimental validation[J]. Chemical Engineering Science, 2007, 62 (7): 2068- 2088.
doi: 10.1016/j.ces.2006.12.054
3 陈冠益, 耿页, 原国栋, 等. 新型电厂烟道弯头的设计及数值模拟[J]. 天津大学学报(自然科学与工程技术版), 2015, 48 (6): 93- 99.
CHEN Guanyi , GENG Ye , YUAN Guodong , et al. Numerical simulation and design of new power plant-based flue duct bend[J]. Journal of Tianjin University(Science and Technology), 2015, 48 (6): 93- 99.
4 赵全斌, 薛朝囡, 刘明, 等. 火电厂烟风通道主要异形件优化研究[J]. 工程热物理学报, 2015, 36 (4): 780- 784.
ZHAO Quanbin , XUE Chaonan , LIU Ming , et al. Optimization on main types of major irregular parts for air & flue gas ducts in thermal power plant[J]. Journal of Engineering Thermophysics, 2015, 36 (4): 780- 784.
5 ZHANG Y , MCLAURY B S , SHIRAZI S A . Improvements of particle near-wall velocity and erosion predictions using a commercial CFD code[J]. Journal of Fluids Engineering, 2009, 131 (3): 031303.
doi: 10.1115/1.3077139
6 El-BEHERY S M , HAMED M H , IBRAHIM K A , et al. CFD evaluation of solid particles erosion in curved ducts[J]. Journal of Fluids Engineering, 2010, 132 (7): 071303.
doi: 10.1115/1.4001968
7 LIN Nan , LAN Huiqing , XU Yugong , et al. Effect of the gas-solid two-phase flow velocity on elbow erosion[J]. Journal of Natural Gas Science and Engineering, 2015, 26, 581- 586.
doi: 10.1016/j.jngse.2015.06.054
8 刘荣堂, 王宇, 刘明, 等. 燃煤电站除尘器前烟道磨损特性与优化研究[J]. 工程热物理学报, 2019, 40 (4): 88- 92.
LIU Rongtang , WANG Yu , LIU Ming , et al. Investigation and optimization on erosion characteristics of the flue gas pipe before the dust collector in power plants[J]. Journal of Engineering Thermophysics, 2019, 40 (4): 88- 92.
9 于飞, 刘明, 王汀, 等. 弯头内气-固两相流动与管壁磨损特性研究[J]. 工程热物理学报, 2015, 36 (4): 796- 800.
YU Fei , LIU Ming , WANG Ting , et al. Numerical research on gas-solid two phase flow and erosion in elbows[J]. Journal of Engineering Thermophysics, 2015, 36 (4): 796- 800.
10 邹欢.锅炉尾部烟道烟气三维流场的数值模拟及均流装置的研究[D].济南:山东大学, 2013.
ZOU Huan. Numerical simulation of three-dimensional gas flow field in boiler tail flue and study on flow-equalizing equipment [D]. Jinan: Shandong University, 2013.
11 TAYLOR A M K P . Curved ducts with strong secondary motion: velocity measurements of developing laminar and turbulent flow[J]. Journal of Fluids Engineering-transactions of the Asme, 1982, 104 (3): 350- 359.
doi: 10.1115/1.3241850
12 KLIAFAS Y , Holt M . LDV measurements of a turbulent air-solid two-phase flow in a 90° bend[J]. Experiments in Fluids, 1987, 5 (2): 73- 85.
doi: 10.1007/BF00776177
13 ENAYET M M , GIBSON M M , TAYLOR A M K P , et al. Laser-doppler measurements of laminar and turbulent flow in a pipe bend[J]. International Journal of Heat and Fluid Flow, 1982, 3 (4): 213- 219.
doi: 10.1016/0142-727X(82)90024-8
14 谢振华, 周艳荣. 90°方截面弯管内加装导流板的优化研究[J]. 应用基础与工程科学学报, 2009, 17 (4): 79- 85.
XIE Zhenhua , ZHOU Yanrong . Optimization research on guide plate installed in quadrate 90° curved duct[J]. Journal of Basic Science and Engineering, 2009, 17 (4): 79- 85.
15 周艳荣, 谢振华. 90°方截面弯管内气固两相流场的数值模拟[J]. 西安科技大学学报, 2008, 28 (1): 50- 54.
ZHOU Yanrong , XIE Zhenhua . Numerical simulation of gas-solid two-phase flow in a 90° curved duct[J]. Journal of Xi′an University of Science and Technology, 2008, 28 (1): 50- 54.
16 于飞, 刘明, 李卫东, 等. 90°矩形截面弯头内置导流板的布置优化研究[J]. 动力工程学报, 2015, 35 (2): 147- 152.
YU Fei , LIU Ming , LI Weidong , et al. Layout optimization of guide plates in a 90 degree elbow with rectangular cross section[J]. Journal of Chinese Society of Power Engineering, 2015, 35 (2): 147- 152.
17 贾兴豪, 彭向和, 龙血松. 导流板改善弯管流场的数值模拟与优化[J]. 西南大学学报(自然科学版), 2011, 33 (3): 139- 143.
JIA Xinghao , PENG Xianghe , LONG Xuesong . Numerical simulation and optimization of flow field in elbow pipes with baffle[J]. Journal of Southwest University(Natural Science), 2011, 33 (3): 139- 143.
18 王周君, 黎星华, 唐立军, 等. 矩形截面直角弯管内置导流板的优化研究[J]. 华电技术, 2019, 41 (8): 32- 37.
WANG Zhoujun , LI Xinghua , TANG Lijun , et al. Optimization research on deflectors installed in right-angle bend tube with rectangular sectior[J]. Huadian Techno-logy, 2019, 41 (8): 32- 37.
19 王宇, 何琪, 于飞, 等. 组合弯头内气固两相流动磨损特性的数值模拟与结构优化[J]. 中国电机工程学报, 2018, 38 (3): 832- 839.
WANG Yu , HE Qi , YU Fei , et al. Numerical simulation of the erosion characteristics and structure optimization of elbows connection for gas-solid flow[J]. Proceedings of the CSEE, 2018, 38 (3): 832- 839.
20 SUN hongchuang , QIN Jiang , HUANG Hongyan , et al. Numerical simulation of flow and heat transfer in a square rotating U-duct using hydrocarbon fuel[J]. Journal of Heat Transfer, 2019, 141 (3): 031701.
doi: 10.1115/1.4042299
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