| 姜水生，陈鹏，文华.亚克力透明喷油嘴的流固耦合分析[J].内燃机工程,2017,38(6):80-85. |
| 亚克力透明喷油嘴的流固耦合分析 |
| Analysis of Fluid Structure Interaction of Transparent Nozzles Made with Acrylic |
| DOI： |
| 关键词:柴油机 透明喷油嘴 流固耦合 应力 变形 |
| Key Words:diesel engine transparent nozzle fluid structure interaction stress distribution |
| 基金项目:国家自然科学基金项目（51466009） |
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| 摘要点击次数: 2029 |
| 全文下载次数: 1555 |
| 摘要:基于亚克力(PMMA)透明喷油嘴内流动的试验研究结果，构建了透明喷油嘴的三维模型，通过流固耦合(FSI)方法对透明喷油嘴的固体变形及应力分布情况进行模拟研究。模拟结果表明，透明喷油嘴的变形与应力均主要集中在压力室及喷孔入口处，其中压力室入口处应力最大,超过胶粘剂的粘黏强度是造成透明喷油嘴产生裂缝失效的主要原因。同时分析了孔内流体体积随入口压力的变化情况及固体变形对孔内流体流动特性的影响。结果表明：在使用透明喷油嘴喷油时，固体产生的变形会造成在针阀关闭后柴油完全断流的时间较实际喷油嘴有所延后，最后喷出的质量也略大，导致试验过程中在喷油结束后存在较长时间的滴落现象。 |
| Abstract:For a depth study of the experimental results of the fuel flow inside transparent nozzles made with acrylic (PMMA), a three dimensional numerical simulation was carried out with the fluid-structure-interaction(FSI) for analyzing the solid deformation and stress distribution of a tested acrylic nozzle. The simulation results show that the deformation and stress of the nozzle mainly occur in the pressure cavity and at the inlet of the orifice. And the maximum stress is at the entrance of the cavity where the nozzle is connected to the rest of the injector by adhesive. The maximum stress is greater than the adhesive force, causing the failure of the transparent nozzle. Then the change of fluid volume with injection pressure and the effect of solid deformation on fluid flow characteristics were also researched. The results show that the solid deformation of the nozzle leads to the delay of fuel cut-off compared to its actual nozzle, and the total fuel mass discharged from the nozzle increases slightly. The solid deformation also leads to a fact that fuel is continually discharged from the transparent nozzle over a long period of time after injection is over, consistent to the experiment results. |
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