查询词典 poppet valve

In chapter 7, the DPIV (Digital Particle Image Velocimetry) systems is set up, the physical models such as sudden expansion channel, flow-out poppet valve and spool valve is fabricated.

第七章建立流场DPIV实验可视化系统，制做突然扩大流道模型，外流式锥阀模型和滑阀模型，并利用粒子图像测速技术对模型的速度场进行测量。

Combining experimental solution and CFD analyses,a method to appraise noise of poppet valve was studied.

结合试验结果和计算流体动力学的解析结果，研究液压锥阀的噪声评价方法。

This is the air-actuated poppet valve that will serve as the ballast tank blow vent.

这是空气驱动锥阀将充当压载水舱的打击，发泄。

The hydraulic poppet valve is one of the most important component in the hydraulic transmission and control, whose characteristics of the inner flow field directly influents the valve s performance, especially the moving valve cone.

液压锥阀是流体传动与控制技术中重要的基础元件，锥阀内的流场特性直接影响阀的性能，特别是锥阀阀芯在运动过程中的流动特性对阀的工作性能有很大的影响。

The theoretical foundation for further research is established. In chapter 6, the flow field of poppet valve and spool valve which are two kinds valve frequently used in hydraulic technique are predicated by finite element method. The flow field structure at different valve opening are illustrated by visualizing images. The effect on the flow noise and energy loss probably caused by vortexes is analyzed quantitatively, the flow channel of the valve is improved.

第六章用有限元方法对液压传动与控制中最常见的两种结构形式的液压阀—液压滑阀和液压锥阀流场进行数值预报，给出不同开口度和不同结构尺寸下流场结构的可视化图像，定性分析涡旋的产生对流体噪声及能量损失可能产生的影响，并对阀的流道结构进行改进。

To improve the response speed of on-off solenoid valve of big flux,detailed analysis on poppet valve is given and an on-off solenoid valve with movement of both spool and cover is designed.

通过对锥阀特性的分析，设计了一种阀芯、阀套同时运动的芯套双动高速开关阀，该阀增大了高速开关阀的开口度，提高了响应速度和流量。

Cavitations is the major problems of designing water hydraulic valve, understanding the relationship between shape of valve and cavitations , avoiding cavitations is extremely important, this paper, the numerical simulation and visualization research of flow field is carried out to research relation between the flow field of poppet valve and the length of valve seat by finite volume numerical method.

气穴是研制水压阀存在的主要难题，认识阀口形状与气穴的关系，避免产生气穴现象是极其重要，本文应用有限体积数值计算方法针对阀座倒角长度变化对水压阀阀道内流场的影响进行数值模拟和可视化研究，得到了一些有益的结论：倒角长度的改变对阀口间隙以及阀芯锥面与柱面相接的地方的负压会产生比较大的影响

Furthermore, The effects of inlet velocity, outlet pressure, opening size as well as cone angle on cavitation intensity in the poppet valve, ball valve and water hydraulic poppet valve were numerically investigated.

进一步分析了锥阀，球阀和纯水液压锥阀阀口几何参数与边界条件对气穴的影响。

In order to optimize the spring of the reciprocating pump valve and establish the best spring factor matching, the unsteady opening-closing process of the poppet valve was simulated. The simulation based on computational fluid dynamics approach, and the dynamic-grid technology and User Defined Function was conducted to depict the law of motion of the poppet valve.

采用RNG k-ε湍流模型、动网格技术以及用户自定义程序，对往复泵泵阀的启闭过程进行了非定常数值仿真，得出了不同弹簧因素下、阀门从开启到关闭的过程中，阀芯的升程随时间的变化规律、阀的迟滞关闭时间以及阀芯落座的瞬时速度。

The flow characteristics in a genuine poppet valve was simulated in three dimensions and calculated at its different opening positions,poppet angles and flow volumes by using a CFD software of Fluent.

运用CFD通用软件F luent，以实际液压锥阀为模型，对阀芯在不同开口度、不同半锥角以及不同流量下的流动特性进行了三维仿真计算，并对可视化图形进行了分析。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。