壁面振动致气缸套空蚀现象模拟

发布时间：2019-07-06 13:53

【摘要】：为研究气缸套受活塞敲击而产生的壁面振动对气缸套振动壁面附近冷却水流场的空蚀影响情况,通过使用计算流体力学(CFD)方法,基于AVL-Fire流体计算软件提供的欧拉多相流空化模型,结合动网格技术建立近振动壁面处流场区域的多相流流场空化模型,将气缸套出现空蚀的振动壁面处的振动特性及其附近冷却水的流场特性进行耦合分析,得到了壁面衰减振动条件下流场的空化特性.对比在壁面振动条件下的流场空化云图,结果表明:气缸套壁面振动是气缸套空蚀的主要因素,受振动壁面影响而产生的空化气泡将在狭隙后圆弧壁面处聚集并溃灭,造成此处的空蚀较为严重,这与气缸套穴蚀部位的试验统计结果一致.通过对比同样壁面振动条件下入口流速不同时流场的空化云图,发现流场处于较大流速状态下,更容易产生空化区域.
[Abstract]:In order to study the effect of wall vibration on cavitation erosion of cooling water flow field near the vibrating wall of cylinder liner caused by piston percussion, the cavitation model of multiphase flow field near the vibrating wall of cylinder liner is established by using computational fluid dynamics (CFD) method and Euler multiphase flow cavitation model provided by AVL-Fire fluid calculation software. The vibration characteristics of the vibration wall of the cylinder liner with cavitation erosion and the flow field characteristics of the cooling water near the cylinder liner are analyzed by coupling analysis, and the cavitation characteristics of the flow field under the condition of wall attenuated vibration are obtained. Compared with the cavitation cloud diagram of the flow field under the condition of wall vibration, the results show that the wall vibration of the cylinder liner is the main factor of cavitation erosion of the cylinder liner, and the cavitation bubbles produced by the vibration wall will gather and collapse at the circular arc wall behind the gap, resulting in serious cavitation erosion, which is consistent with the experimental statistical results of the cavitation corrosion site of the cylinder liner. By comparing the cavitation cloud images with different inlet velocity under the same wall vibration condition, it is found that the cavitation region is more likely to occur when the flow field is in a high velocity state.
【作者单位】：河南科技大学车辆与交通工程学院;
【基金】：河南省科技计划项目(144300510039)
【分类号】：TK421

【相似文献】