%0 Journal Article
%T 锥形节流阀的三维流-固耦合非稳态动力学特性仿真分析<br>Simulations of the unsteady fluid-structure coupling characteristics of a conical orifice valve
%A 吕振华
%A 李明
%J 清华大学学报（自然科学版）
%D 2018
%R 10.16511/j.cnki.qhdxxb.2018.22.006
%X 针对特种重型车辆用液阻减振装置的一种锥形节流阀的动态工作过程，建立了该阀较精细的三维流-固耦合有限元仿真分析模型，利用直接耦合计算方法求解入口瞬态流速激励下锥阀的耦合动力学响应；通过对锥阀在多种弹性压紧力特性、结构设计状态和多种入口流速激励工况下的流体压强差及速度分布、阀门开度及阀芯受力等动态响应的细致量化分析，解释了锥阀流-固耦合自激振动现象的机理：当弹簧预紧力较大而入口流速较小时，锥阀在开启过程中必然出现阀门开度高频波动、阀芯回弹接触冲击等流-固耦合自激振动现象；取消弹簧预紧力，即可有效地抑制阀门开启过程的非稳态自激振动；入口流速幅值较大时，阀门开启波动过程缩短。这些认识对于解决许多流体阀系存在的流-固耦合自激振动问题具有重要意义。<br>Abstract：The dynamics of a conical orifice valve in a heavy-duty vehicle damper were analyzed using 3-D fluid-structure coupling finite element models solved using the direct coupling computational method. The results show the internal 3-D transient fluid pressure and velocity distributions for transient inlet flow rates and the unsteady high-frequency fluctuations of the valve opening and the forces on the valve. The dynamic responses are given for various compression spring characteristics, valve structure parameters and inlet flow rates to understand the fluid-structure coupling self-excited vibrations of the valve. The results show that heavily preloaded valve springs and small inlet flow rates lead to high-frequency fluctuations of the valve opening and collisions of the core onto the seat. In addition, a zero preload of the valve spring eliminates the fluid-structure coupling vibrations and large inlet flow rates reduce the unsteady opening fluctuations. These conclusions are important for understanding fluid-structure coupling self-excited vibration problems in valves.
%K 三维流-固耦合动力学
%K 自激振动
%K 有限元仿真
%K 直接耦合计算方法
%K 锥形节流阀
%K 液阻减振器
%K &lt
%K br&gt
%K 3-D fluid-structure coupling dynamics
%K self-exited vibration
%K finite-element simulation
%K direct coupling numerical method
%K conical orifice valve
%K hydraulic damper
%U http://jst.tsinghuajournals.com/CN/Y2018/V58/I1/35