珠江口“门”的双向射流指标体系研究

以虎门为例,根据野外水文、地形图等资料,分析了珠江口"门"的双向射流指标体系,重点讨论了射流强度、双向不对称系数等量化指标.     

喷雾对纳米粉尘采集效率的影响

结合射流负压吸气和湍流雾滴冲击纳米粉尘原理,自制出一套纳米粉尘采样装置.对装置的采集原理进行了介绍,考察了雾化、雾化润湿和双雾化系统对纳米粉尘采集效率的影响.研究结果表明：仅雾化系统对纳米粉尘的采集效率为35%左右;被雾化润湿过的纳米粉尘更易被捕获,装置的采集效率能达到53%;而高速紊乱的双喷雾系统对纳米粉尘的采集效率可高达80%.     

溢洪道消能方案研究进展

将国内外有关溢洪道消能方案的研究成果进行了归纳和总结,着重探讨了挑流消能、底流消能和阶梯溢洪道消能,并介绍了一些新型的消能方案和模型试验成果。     

高压旋喷注浆法简析及实际应用

文中根据“高压旋喷注浆法”在地基加固中的理论依据，对３５ｋｖ双树变电所的地基加固处理工程的实际应用进行了探讨。     

二相流理论在光整加工技术中的应用研究

阐述了二相流的基本理论，探讨了其在光整加工技术中的应用，介绍了二相流基本理论在光整加工技术中的3种应用工艺。     

Effects of injection temperature on the jet evolution under supercritical conditions

A nitrogen jet with subcritical and supercritical injection temperatures injected into a supercritical environment, in which both the pressure and temperature exceed those of the thermodynamic critical state, has been investigated numerically using large-eddy simulation technique. The effects of the injection temperature on the flow evolution are studied. We find that the jet surface is more unstable with the instability waves growing up and rolling into a succession of ring vortices for supercritical injection temperature, and the jet surface is nearly straight with the strong density stratification suppressing the development of the instability waves for subcritical injection temperature. With increasing injection temperature, the spatial growth rate of the surface instability wave strengthens and the frequency of the most unstable mode increases. This behavior is of importance in enhancing the fluid mixing effect. The results obtained in this study provide physical insight into the understanding of fundamental mechanisms of the jet evolution under supercritical conditions.     

Visualization of Coherent Structures in Acoustically Forced, Gas-Particle Turbulent Round Jet

To show the effects of the particles and forced disturbances on the instantaneous large-scale vortex structures in a gas-particle round jet, coherent structures in gas-particle turbulent round jets were investigated experimentally by flow visualization. The 45-μm and 350-μm diameter glass beads were used as the particles in the experiments. An acoustic speaker was used to introduce velocity perturbations at the jet exit. The Strouhal number based on the nozzle diameter, exit velocity, and forcing frequency was varied from 0,1 to 0.9. The Reynolds number was 9400. The coherent structures were visualized in unforced and forced single-phase jet flows and unforced and forced particle-laden jet flows with different diameter glass beads. The experimental results show that the particles have significant effects on the gas phase coherent structures. The coherent structures are controlled by the large 350-μm diameter particles, while the structures are mainly dominated by the forced disturbances in the flows with 45-μm diameter particles.     

砂轮在线液体平衡装置和控制系统

本文系统地论述了砂轮平衡的力学原理及在线液体平衡原理。研制出一套包括高精度测量通道的砂轮在线液体平衡装置，对采用微机实现在线自动平衡控制进行了研究。     

磁粒光整加工技术的应用与发展

光整加工作为模具加工的最后一道工序 ,其加工质量一般影响着产品的最终质量和使用性能 .尽管模具加工的大部分工序实现了自动化 ,但模具光整加工的自动化却一直无法实现 ,其加工工作量要占整个工作量的 30 %～ 40 % ,严重制约着生产的发展 .磁粒光整加工技术的出现 ,为模具光整加工自动化的实现带来了希望