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| 液压阀内部漩涡流动的数值研究 |
| Numerical study on vortex flow in hydraulic valves |
| 投稿时间：2023-03-14 |
| DOI：10.13259/j.cnki.eri.2023.03.008 |
| 中文关键词: 数值模拟|漩涡|流场|压力脉动|涡识别方法 |
| 英文关键词:numerical simulation|vortex|flow field|pressure fluctuation|vortex identification method |
| 基金项目:国家自然科学基金资助项目（51106099）；国防科工局基础产品创新科研项目 |
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| 中文摘要: |
| 针对液压阀内漩涡流场及其诱发振动噪声的非定常流动激励力特性，采用计算流体力学方法对内部漩涡流动进行了数值计算，分析了阀内涡系结构的成因及流动特性，对比了不同漩涡识别方法捕捉阀内涡系结构的特性。结果表明：液压阀的流量特性为快开型，阀内不同节流段的压力损失特性不同。液压阀内出现分离涡、对冲涡、死区涡和迪恩涡四种典型的漩涡结构，漩涡的成因各异。在不同工况下，迪恩涡区域的压力脉动均较强，且受流量和漩涡的叠加影响，压力脉动幅值与阀门开度不是线性相关，在50%阀门开度时，压力脉动幅值最大。对比4种不同涡识别方法发现，Ω−Liutex方法有助于识别液压阀内漩涡结构。 |
| 英文摘要: |
| Aiming at the unsteady flow excitation force of vortex flow field and its induced vibration noise in hydraulic valves, the internal vortex flow was simulated using the computational fluid dynamics method. The cause and flow characteristics of vortex system structure in a valve were analyzed. The characteristics of different vortex identification methods for capturing the vortex system structure in a valve was compared. Results show that the flow characteristics of hydraulic valves is fast opening type, and the pressure loss characteristics at different throttling sections in the valves is different. There are four typical vortex structures in the hydraulic valves such as separation vortex, counter vortex, dead zone vortex and Dean Vortex with different origins. Under the four opening degrees, the pressure pulsation in Dean Vortex area is strong, which is affected by the superposition of flow and vortex. The amplitude of pressure pulsation in Dean Vortex area is not linear with the opening degree, and its largest value is achieved at 50% opening. The comparison of four different vortex identification methods indicates that Ω - Liutex method is helpful to identify the vortex structure in the hydraulic valves. |
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