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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2024, Vol. 58 Issue (5): 1050-1059    DOI: 10.3785/j.issn.1008-973X.2024.05.018
    
Numerical simulation of mooring performance of waterjet propulsion system
Ruofan FENG1,2(),Tianxiong LIANG1,Ning LIANG1,Linlin CAO1,2,*(),Dazhuan WU1,2
1. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China
2. Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Jiaxing 314031, China
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Abstract  

A calculation method based on volume of fluid (VOF) was adopted based on mooring tests to numerically simulate the flow field characteristics of waterjet propulsion under mooring conditions in order to analyze the internal flow characteristics of waterjet propulsion under mooring conditions. The comparison with the mooring test data showed that the total thrust and torque obtained based on this method agreed well with the test data. The method can effectively simulate the free jet flow field of the waterjet propulsion. The numerical simulation results of waterjet propulsion show that the growth rate of the Euler’s head inside the impeller tends to be constant as the impeller speed increases, and the efficiency of the impeller increases. The areas with high entropy increase inside the impeller are mainly distributed near the impeller inlet, wall surface and blade tip, where the flow loss is large, which is closely related to the significant flow separation at waterjet duct under mooring conditions.

Key words： waterjet propulsion      mooring test      volume of fluid      internal flow     
Received: 11 May 2023      Published: 26 April 2024
CLC:  U 644  
Fund:  国家自然科学基金资助项目（52171326）.
Corresponding Authors: Linlin CAO     E-mail: 22227168@zju.edu.cn;caolinlin@zju.edu.cn
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Ruofan FENG
Tianxiong LIANG
Ning LIANG
Linlin CAO
Dazhuan WU
Cite this article:

Ruofan FENG,Tianxiong LIANG,Ning LIANG,Linlin CAO,Dazhuan WU. Numerical simulation of mooring performance of waterjet propulsion system. Journal of ZheJiang University (Engineering Science), 2024, 58(5): 1050-1059.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2024.05.018     OR     https://www.zjujournals.com/eng/Y2024/V58/I5/1050


喷水推进器系泊工况性能的数值模拟

为了分析系泊工况下喷水推进器的内流特性，在系泊试验的基础上采用基于流体体积法（VOF）的计算方法，对喷水推进器的系泊工况内流场特性进行数值模拟研究. 对比系泊试验数据发现，基于该方法得到的推进器总推力和转矩与试验数据吻合较好，该方法可以较好地模拟喷水推进器自由喷射流场. 从喷水推进器数值模拟结果可知，当叶轮转速增加时，叶轮内部欧拉扬程的增长速度趋于恒定，叶轮的效率增加；叶轮内部熵增较高的区域主要分布在叶轮入口、壁面和叶顶附近，表示该区域流动损失较大，与系泊工况下喷水推进器的进口流道处存在较大程度的流动分离密切相关.


关键词： 喷水推进,  系泊试验,  流体体积法,  内部流动 
Fig.1 Structure of waterjet propulsion
参数设计值参数设计值
${n_{\mathrm{r}}}$/（r·min?1）2 500$D$/mm349
${q_{{m}}}$/（kg·s?1）1112.5${C_{\mathrm{r}}}$3
${H_{\mathrm{r}}}$/m23.7${C_{\mathrm{s}}}$10
Tab.1 Parameters of waterjet propulsion
Fig.2 Structure of mooring test rig for waterjet propulsion
Fig.3 Construction of mooring test rig for waterjet propulsion
Fig.4 Computational domains and boundary conditions of numerical simulation
区域网格单元数
进口流道1 292 914
叶轮2 095 674
导叶1 402 700
喷口附近外流场2 080 789
远离喷口外流场2 678 444
总网格单元数9 550 521
Tab.2 Number of grid cells in each part of computational domains
Fig.5 Grids of various parts of computational domains
网格编号N网格编号N
111 507 09237 930 255
29 550 52146 593 938
Tab.3 Number of four sets of grids with different densities
Fig.6 Grid independence analysis
网格${R_{\mathrm{G}}}$${U_{{\text{SN}}}}$/%${U_{\text{V}}}$/%
1,2,3?0.0890.2366.005
2,3,4?0.3560.6646.037
Tab.4 Results of uncertainty analysis of torque
Fig.7 Comparison between calculated and experimental results of waterjet pump performance parameters
Fig.8 Jet flow field at different pump speeds under forward conditions
Fig.9 Relationship between jet length and head
Fig.10 Relationship between head and pump speed
Fig.11 Leading and trailing edge surfaces of impeller
Fig.12 Overall Euler’s head distribution of impeller under different flow rates
Fig.13 Normalized overall Euler’s head distribution of impeller under different flow rates
Fig.14 Slope distribution of normalized overall Euler’s head curve
Fig.15 Variation of impeller efficiency with pump speed
Fig.16 Relationship between efficiency and pump speed
Fig.17 Entropy generation rate of impeller region
Fig.18 Percentage of entropy generation rate in different regions
Fig.19 Entropy generation rate of impeller region at speed of 1 485 r/min (span = 0.05、0.50、0.95)
Fig.20 Entropy generation rate and velocity distribution of impeller (span = 0.5)
Fig.21 Entropy generation rate distribution of waterjet duct (1 485 r/min)
Fig.22 Velocity distribution of waterjet duct (1 485 r/min)
Fig.23 Vortex distribution of waterjet duct
Fig.24 Velocity distribution at each section before impeller inlet (1 485 r/min)
Fig.25 Velocity vector diagram of waterjet duct
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