Numerical Simulations and Pressure Measurements of the Flow of an Oily Control Valve for Decreasing its Operating Noise.

油控制阀流量的数值模拟和压力测量，以降低其操作噪音。

• 批准号: 05650161
• 负责人: OKAJIMA Atsushi
• 金额: $ 1.6万
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650161/
• 关键词: Oil Hydraulics System; Noise Measurement; Numerical Analysis; Cavitation; Control Valve of Oil Hydraulics; Finite Volume Method; Noise Reduction; Shape of Valve

The valve noise due to cavitation has frequently been serious problems with the increase of an operating pressure. This study contributes to the optimistic design of velve and to the decrease of cavitation noise by studying the internal flow of the calve in the transient process of closing and opening. First, at Reynolds number of about 10 ^3, for poppet valves with different configurations, we have carried out noise tests and numerically simulated oil-flows under an assumption of noncavitating conditions by a finite difference method. In addition, we have performed the measurements of pressure at two locations in a valve chamber, the flow visualization and noise tests. By comparison of the measured and computed results, good correspondences between the flow pattern and noise measurements were obtained. It is confirmed that the noise is mainly generated from cavitation and strongly depends on the valve configuration of the poppets and the sleeves. A large valve chamber is effective to … More suppress cavitation due to the formation of a stationary large circulating flow, and the second stage restrictors is effective to reduce the pressure fluctuation by suppressing the generation of periodic vortiodic vortices. On the other hand in the case of expansion valve, simulation were made for both laminar and turbulent (kappa-epsilon turbulence model) flows. For laminar flow, strong vortex street was observed to shed along the axis of chamber downstream the poppet and pressure fluctuation also increases, while for turbulent flow by kappa-epsilon turbulence model, the jet flow separated from the poppet gets reattached over chamber walls, resulting in the formation of recirculation region just behind the poppet and the decrease of pressure fluctuation. These results agree well with visualization. Second, for spool valve, nomerical simulations were conducted for various valve configuration. The static characteristics at various valve open/close ratios and dynamic characteristics in the transient process of opening and closing operation, such as flow patterns, axial forces and angles of jet were computed. For static characteristics, fluid forces change, greatly corresponding with the flow direction through the valve and the associated recirculation region. For dynamic characteristics, unsteady flow patterns, force fluctuations in the transient process of closing and opening operations were numerically simulated. Correspondence between the vortices formed from valve shoulder and the fluctuating component of fluid forces with high frequency was certified. In experiments, both actual valves and valve-models with half size of actual one were employed. Axial forces at various valve open/cose ratios were measured using a load cell. The measured results agree well with those of simulations. In addition, flow-patterns visualized with the half size model were found to agree quantiatively well with those of simulations. With the assumption of laminar, axial symmetric flow, t Less

随着操作压力的增加，由于气穴现象而产生的阀噪声经常成为严重的问题。通过对阀门启闭瞬态过程中内部流动的研究，有助于阀门的优化设计和降低空化噪声。首先，在雷诺数约为10^3时，我们对不同结构的锥阀进行了噪声试验，并采用有限差分法在非空化条件下对油流进行了数值模拟。此外，我们还进行了阀室内两个位置的压力测量、流场显示和噪声测试。通过计算结果与实测结果的比较，得到了流场与噪声测量值之间的良好对应关系。据证实，噪声主要是由气穴产生的，并强烈依赖于阀配置的提升阀和套筒。一个大的阀室有效地 ...更多信息 抑制由于形成稳定的大循环流而引起的空化，并且第二级限制器通过抑制周期性涡流的产生而有效地减小压力波动。另一方面，在膨胀阀的情况下，模拟层流和湍流（kappa-kappa湍流模型）。层流时，在提升阀后沿腔体轴线方向沿着脱落，压力脉动增大;而湍流时，采用kappa-martz湍流模型，从提升阀分离出来的射流在腔体壁面上重新附着，在提升阀后形成回流区，压力脉动减小。这些结果与可视化吻合得很好。其次，对于滑阀，对不同的阀结构进行了数值模拟。计算了不同启闭比下的静态特性和启闭瞬态过程中的流态、轴向力和射流角度等动态特性。对于静态特性，流体力变化，与通过阀和相关的再循环区域的流动方向极大地对应。针对动态特性，数值模拟了非定常流态、启闭瞬态过程中的力波动。验证了阀肩处形成的旋涡与流体力高频脉动分量的对应关系。实验中采用了实际阀门和尺寸为实际阀门一半的阀门模型。使用测力传感器测量不同瓣膜开闭比下的轴向力。测量结果与模拟结果吻合较好。此外，与半尺寸模型可视化的流动模式被发现同意定量以及与模拟。假设层流、轴对称流，t减

项目成果

大路 芳弘: "スプール弁内流れの数値シミュレーション" 日本油空圧学会 平成7年秋季油空圧講演会講演論文集. 53-56 (1995)

Yoshihiro Ohji：“滑阀中流量的数值模拟”日本液压与气动学会，1995 年秋季液压与气动会议论文集 53-56 (1995)。

上野 久儀: "スプール弁内の流れと流体力" 日本油空圧学会 平成6年秋季油空圧講演会講演論文集. 9-12 (1994)

Hisayoshi Ueno：“滑阀中的流量和流体力”日本液压气动学会，1994 年秋季液压气动会议论文集 9-12 (1994)。

Hisanori,UENO: "Visualization of cavitating flow and numerical simulation of flow in a poppet valve" Proceedings of the 2nd JHPS International Symposium on Fluid Power. 385-390 (1993)

Hisanori，UENO：“空化流的可视化和提升阀中流动的数值模拟”第二届 JHPS 国际流体动力研讨会论文集。

Yasunari MUROMIYA, Hisanori UENO, Atsushi OKAJIMA: "Flow-pattern and Fluiddynamic Force of Oily Spool Valve" Proceedings of the 31 Hokuriku-Shinetsu Branch Annual Meeting, JSME. No.947-01. 151-153 (1994)

Yasunari MUROMIYA、Hisanori UENO、Atsushi OKAJIMA：“油滑阀的流动模式和流体动力”第 31 届北陆信越分会年会记录，JSME。

Atsushi OKAJIMA, Takashi NISHI, Tatsumi KANNON: "Numerical and Experimental Studies on Flows Through an Expansion Valve and a Sudden-Expansion Pipe" Proceedings of the 3rd JSME-KSME Fluids Engineering Conference. 692-696 (1994)

Atsushi OKAJIMA、Takashi NISHI、Tatsumi KANNON：“通过膨胀阀和突然膨胀管道的流动的数值和实验研究”第三届 JSME-KSME 流体工程会议论文集。