以环形橡胶-硅油组合式减振器为研究对象,通过ANSYS开展了其静态刚度特性研究.通过橡胶样件的单轴拉伸试验,基于试验数据拟合确定了多种橡胶超弹性本构模型参数.分别建立了减振器固体有限元模型和流体有限元模型,进行静态刚度仿真.通过试验机开展了该减振器静态刚度试验.对比分析静态仿真与静态试验,选取了Neo-Hookean超弹性本构模型,分析了橡胶外径、橡胶内径和硅油粘度对静态刚度的影响.研究结果为该减振器的应用提供了支持.

It is easy for CO2to block the anode channel due to the reduction of μDMFC structure size,and effect the gas-liquid flow in the channel. Since it is difficult for post-processing to directly obtain the gas fraction of cross section along the S-shaped channel,the second development of FLUENT post-processing was carried out. The model characteristic parameters is transferred in second development program through GUI. The parametric model can be displayed in realtime in the interactive visualization environment based on MAYA. The journal file is taken as the interface to realize the data transmission between MAYA and FLUENT,parametric modeling,and acquire the gas fraction of the cross section along the channel. A new flow-field plate structure is studied on the basis of second development software. It is found that the change of wetting property of channel sidewalls of double-layer flow-field plate can improve the gas-liquid flow property effectively. The post-processing method can provide the effective data acquisition means for studying the channel transport property of the fuel cell,and also provide a solu-tion for studying the gas-liquid two-phase flow phenomenon.

Miniaturization of μDMFC flow channel increases the flow resistance of fluid in the channel.It is easy to make CO2 bubbles block channel.It not only affects the transporting of methanol solution,but also hinders the mass transfer of methanol to the catalyst layer,and decreases electrochemical reaction efficiency.Therefore,it is necessary to improve the transporting properties of gas-liquid in tμDMFC anode channel.The effects of double flow field plate trench sidewall surface wetting properties on gas-liquid two-phase distribution were studied based on the VOF method,and gas-liquid two-phase flow of μDMFC anode channel was simulated by using CFD software FLUENT.It is shown that gas-liquid two-phase in single flow field plate channel renders segmented flow phenomena,and gas-liquid two-phase in double flow field plate channel presents stratified flow phenomena;containing gas rate in double flow field plate is lower than that in the single layer flow field plate channel and pressure drop characteristics of the former is better than the latter.At the same time,the upper layer of the two-layer flow field plate trench sidewalls is hydrophobic,and the lower is hydrophilic,not only good for gas and liquid transportation,but also conducive to the methanol mass transfer.It provides a kind of effective method to enhance the performance of μDMFC.

To study the effects of cross-section shape containing gas rate and pressure drop characteristics on the flow field plates,by keeping the same hydraulic diameter,the rectangle,triangle,hemicycle,trapezoid and inverted trapezoid cross-section channel were designed,respectively,the micro direct methanol fuel cell(μDMFC) anode channel of gas-liquid two-phase flow based on the volume of fluid(VOF) method was simulated.For the rectangle cross-section channel in the single flow field plate,the gas rate was stable at 0.55,the average value of pressure drop was 750 Pa which was minimum thus suitable for optimization.In the case of the same cross-section,for the double flow field plate,the gas rate was about 50％ lower than that of the single flow field plate and the average value of pressure drop was also lower,while the gas rate was the lowest (less than 0.2),the average value of pressure drop was minimum (less than 200 Pa) for the triangle cross-section shape channel which could be used as the optimized shape.

利用Fluent作仿真模拟过程中,有时需要获取某些特殊的曲线或横截面上的数据.传统方式中采用用鼠标点击和参数输入的方式建立这些特殊平面或曲线,不仅工作量大,而且容易出错.本文使用Fluent脚本文件(Scheme语言和TUI语言)编写日志文件,然后由Fluent解释器解释执行的方式获取数据,不仅提升了工作效率,减轻了后处理的工作量,而且此方法还能用于算法研究、批处理等工作中,提升了软件的适用性,满足了用户在特殊工况下的后处理需求.