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浙江大学学报(工学版)
浙江大学学报(工学版)  2024, Vol. 58 Issue (5): 1050-1059    DOI: 10.3785/j.issn.1008-973X.2024.05.018
机械工程     
喷水推进器系泊工况性能的数值模拟
冯若凡1,2(),梁天雄1,梁宁1,曹琳琳1,2,*(),吴大转1,2
1. 浙江大学 化工机械研究所，浙江 杭州 310027
2. 浙江省清洁能源与碳中和重点实验室，浙江 嘉兴 314031
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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摘要：

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    
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
收稿日期: 2023-05-11 出版日期: 2024-04-26
CLC:  U 644  
基金资助: 国家自然科学基金资助项目（52171326）.
通讯作者: 曹琳琳     E-mail: 22227168@zju.edu.cn;caolinlin@zju.edu.cn
作者简介: 冯若凡（2000—），男，硕士生，从事流体机械的研究. orcid.org/0009-0007-7998-6050. E-mail：22227168@zju.edu.cn
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引用本文:

冯若凡,梁天雄,梁宁,曹琳琳,吴大转. 喷水推进器系泊工况性能的数值模拟[J]. 浙江大学学报(工学版), 2024, 58(5): 1050-1059.

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.

链接本文:

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

图 1  喷水推进器的结构
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}}}$10
表 1  喷水推进器的参数
图 2  喷水推进器系泊试验台的结构
图 3  喷水推进器系泊试验台的搭建
图 4  数值模拟计算域和边界条件
区域网格单元数
进口流道1 292 914
叶轮2 095 674
导叶1 402 700
喷口附近外流场2 080 789
远离喷口外流场2 678 444
总网格单元数9 550 521
表 2  计算域各部分的网格单元数
图 5  计算域各部分的网格
网格编号N网格编号N
111 507 09237 930 255
29 550 52146 593 938
表 3  不同密度的4套网格的数量
图 6  网格无关性分析
网格${R_{\mathrm{G}}}$${U_{{\text{SN}}}}$/%${U_{\text{V}}}$/%
1,2,3?0.0890.2366.005
2,3,4?0.3560.6646.037
表 4  转矩不确定度的分析结果
图 7  喷泵性能参数的计算结果与试验结果对比
图 8  不同转速正航工况下的喷射流场
图 9  射流长度与扬程的关系
图 10  扬程与叶轮转速的关系
图 11  叶轮的前缘面和尾缘面
图 12  不同流量下叶轮的总体欧拉扬程分布
图 13  不同流量下的叶轮正则化总体欧拉扬程分布
图 14  正则化总体欧拉扬程曲线的斜率分布
图 15  叶轮效率随转速的变化
图 16  泵效率与转速的关系
图 17  叶轮区域的熵生成率
图 18  不同区域的熵生成率占比
图 19  转速为1 485 r/min时的叶轮单位体积熵生成率（span = 0.05、0.50、0.95）
图 20  叶轮的熵生成率增及速度分布（span = 0.5）
图 21  进口流道的熵生成率分布（1 485 r/min）
图 22  进口流道的流速分布（1 485 r/min）
图 23  进口流道的涡分布
图 24  叶轮进口前各截面的流速分布情况（1485 r/min）
图 25  进口流道的速度矢量图
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