张博,李富柱,王匀,等.小孔流道内容积交变空化流场特性分析[J].精密成形工程,2023,15(10):204-211.
ZHANG Bo,LI Fu-zhu,WANG Yun,et al.Analysis of Cavitation Flow Field Characteristics of Small Hole Runner Based on Volume Alternating Cavitation[J].Journal of Netshape Forming Engineering,2023,15(10):204-211. |
| 小孔流道内容积交变空化流场特性分析 |
| Analysis of Cavitation Flow Field Characteristics of Small Hole Runner Based on Volume Alternating Cavitation |
| 投稿时间：2023-07-27 |
| DOI：10.3969/j.issn.1674-6457.2023.10.024 |
| 中文关键词: 小孔流道 容积交变空化流场 含气率 湍流强度 空化强度 容积交变频率 容积变化量 |
| 英文关键词: small hole runner volume alternating cavitation flow field vapor volume fraction turbulence intensity cavitation intensity volume alternating frequency volume change |
| 基金项目:装备预先研究领域基金(8092301201) |
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| 中文摘要: |
| 目的 基于容积交变空化原理，研究小孔流道内容积交变空化流场的演变规律，以及容积交变频率和容积变化量等关键工艺参数对流场特性的影响，为容积交变空化抛光小孔内表面提供指导。方法 首先，建立小孔流道内容积交变空化流场的三维瞬态仿真模型。其次，采用标准k-epsilon模型、Zwart-Gerber-Belamri模型模拟不同容积交变频率和容积变化量下容积交变空化流场含气率和湍流强度，并与高速摄像结果进行比较分析。最后，对机械加工的Al 1060和T2 Cu小孔内表面进行抛光，验证容积交变空化抛光小孔内表面的可行性。结果 在一个周期内，当容积变化量为20 mm，容积交变频率分别为90、100、110、120 Hz时，小孔流道内容积交变空化流场含气率和湍流强度均随容积交变频率的增大而增大，含气率最高可达0.664 8;当容积交变频率为120 Hz，容积变化量分别为10、15、20、25 mm时，小孔流道内容积交变空化流场含气率和湍流强度均随容积变化量的增大而增大，含气率最高可达0.706 8。随着活塞的拉伸和压缩，湍流强度也由两边强、中间弱逐渐转变为两边弱、中间强，并在周期末达到最大。实验研究表明，经过容积交变空化抛光后，Al 1060小孔内表面的粗糙度由0.704 4 μm降低到0.324 7 μm，T2 Cu小孔内表面的粗糙度由0.721 4 μm降低到0.357 3 μm，小孔内表面粗糙度明显降低。结论 容积交变空化抛光小孔内表面具有可行性。可通过提高容积交变频率和容积变化量来提高小孔流道内容积交变空化流场含气率和湍流强度，进而提高容积交变空化抛光小孔内表面的抛光效率。 |
| 英文摘要: |
| The work aims to analyze cavitation flow field characteristics of the small hole runner based on the principle of volume alternating cavitation and the effect of key process parameters such as volume alternating frequency and volume changes on flow field characteristics, to guide the finishing of inner surface of the small holes based on volume alternating cavitation. A three-dimensional transient simulation model of the volume alternating cavitation flow field in the small hole runner was established. The standard k-epsilon model and the Zwart-Gerber-Belamri model were used to simulate the changes of vapor volume fraction and turbulence intensity under different volume alternating frequencies and volume changes. The results were compared with those of the high-speed camera. In addition, two different materials Al 1060 and T2 Cu were chosen as the target material to verify the feasibility of volume alternating cavitation finishing effects. In a cycle when the volume change was 20 mm and the volume alternating frequency was 90, 100, 110, and 120 Hz respectively, the vapor volume fraction and turbulence intensity in the small hole runner increased with the increase of the volume alternating frequency, and the vapor volume fraction was up to 0.664 8. When the volume alternating frequency was 120 Hz and the volume change was 10, 15, 20, and 25 mm respectively, the vapor volume fraction and turbulence intensity also increased with the increase of the volume change, and the vapor volume fraction was reach up to 0.706 8. As the pistons were stretched and compressed, the turbulence intensity gradually changed from strong on both sides and weak in the middle to weak on both sides and strong in the middle, and reached the maximum at the end of the cycle. Furthermore, the experimental results showed that after volume alternating cavitation finishing, the roughness value of the inner surface of the Al 1060 hole was reduced from 0.704 4 μm to 0.324 7 μm, and the roughness value of the inner surface of the T2 Cu hole was reduced from 0.721 4 μm to 0.357 3 μm, showing an obvious decrease in inner surface roughness. Therefore, it is feasible to finish the inner surface of the small hole by volume alternating cavitation. The vapor volume fraction and turbulence intensity of the cavitation field in the small hole runner can be improved by increasing the volume alternating frequency and volume change, and then the finishing efficiency of the inner surface of the small hole can also be improved. |
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