制动工况桃腔偶合器三维涡特征分析及仿真评价

doi:10.13229/j.cnki.jdxbgxb.20211131

Abstract

Abstract:

Based on large eddy simulation， different sub-lattice turbulence models are used to simulate the flow field of a peach cavity hydrodynamic coupling under braking condition. The Q-criterion vortex recognition method is used to extract the three-dimensional multi-scale vortex structure inside the turbine. The unsteady multi-scale vortex spatiotemporal evolution law， energy transfer and loss mechanism inside the turbine is analysed based on the vortex dynamics theory. In order to verify and evaluate the accuracy and reliability of the simulation results， the velocity field and vorticity field are extracted based on flow field visualization experiment by particle image velocimetry. From the perspective of the qualitative identification of three-dimensional vortex structure spatiotemporal characteristics and the quantitative extraction of two-dimensional flow field parameters： WMLE S-Ω model simulation can provide rich information of three-dimensional multi-scale vortex of the near-wall region on the blade，the small-scale vortex can be captured accurately. WALE model simulation can accurately identify small-scale vortices in the corner area where the blade and the outer ring intersect. The simulation results of the two-dimensional flow field in the mainstream area by WMLES S-Ω model tend to be true， the secondary flow phenomenon in the corner area can be presented accurately. The numerical distribution of the two-dimensional flow field simulation in the near-wall region on the blade by WMLES model is consistent with experimental values. The research results can provide certain theoretical and technical guidance for the flow field simulation of hydrodynamic coupling.

Key words: mechanical engineering, hydrodynamic coupling, large eddy simulation, multi-scale vortex, particle image velocimetry

CLC Number:

TH137.331

Bo-sen CHAI,Dong YAN,Guang-yi WANG,Wen-jie ZUO. Three-dimensional vortex characteristic analysis and simulation evaluation of peach cavity hydrodynamic coupling under braking condition[J].Journal of Jilin University(Engineering and Technology Edition), 2023, 53(11): 3045-3055.

Figures/Tables 16

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References 21

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分析类型	设置条件
计算方法	SIMPLE算法
迭代求解时间步长/s	0.01
迭代计算总步数	300
收敛残差	10^-4

所属系统	设备名称	所属公司
机械部分	YS7124型号三相异步变频调速电机	天津林普机电有限公司
机械部分	2CY 型号齿轮泵负载装置 CLZ 型号联轴器	长春通用机械厂
光学部分	FIBER-21激光片光系统	中西安远讯光电科技有限公司
光学部分	EMT260激光转速测量仪	上海摩亿公司
图像采集	FR340-10G高清CCD相机	广州元奥仪器有限公司

序号	检测直径/px	实际直径/mm	标定系数/（mm·px^-1）
均值	20.33	2	0.098
1	20.94	2	0.096
2	20.56	2	0.097
3	18.86	2	0.106
4	19.96	2	0.098
5	21.08	2	0.092
6	20.56	2	0.097

序号	流速/（m·s^-1）
序号	SL	WALE	KET	WMLES	WMLESS-Ω	PIV
1	3.7	3.8	3.4	3.4	3.7	2.7
2	4.2	3.4	3.7	3.8	3.4	3.1
3	1.9	2.9	2.4	2.0	3.1	3.2
4	1.3	2.1	1.3	1.6	1.6	3.5
5	1.6	1.4	0.8	1.2	1.4	2.4
6	1.5	1.3	0.4	0.6	0.9	3.2
7	1.1	1.2	1.0	0.2	0.7	2.5
8	0.3	1.6	1.1	1.9	1.9	2.0
9	2.7	3.1	3.9	2.6	3.6	4.7
10	5.3	3.5	5.2	5.4	5.2	5.1

序号	涡量/s^-1
序号	SL	WALE	KET	WMLES	WMLES S-Ω	PIV
1	170	160	200	470	140	-100
2	650	500	750	900	450	380
3	210	420	330	550	350	350
4	360	320	200	150	930	230
5	130	160	350	220	360	-260
6	850	100	230	230	370	220
7	450	320	250	230	370	220
8	200	320	500	370	850	-340
9	890	740	900	930	950	580
10	170	320	130	100	270	-320

Three-dimensional vortex characteristic analysis and simulation evaluation of peach cavity hydrodynamic coupling under braking condition

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