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     

中温固化水溶性酚醛树脂粘结剂制备与性能

水溶性酚醛树脂粘结剂,国外已广泛应用于防水砂纸的生产,国内尚未见此类报道。 研究了中温固化水溶性酚醛树脂生产的投料比(HCHO/PhOH),催化剂用量(NaOH/PhOH),反应温度和时间,增韧剂聚乙烯醇缩醛与树脂配比,制出防水砂纸并检验其性能。     

A THEORY ON TEA-POT EFFECT

In this paper exit.bend angle(tea-pot effect)has been analysed theoretically based on thebasic)aw of hydromechanics.It was proved that it is the transverse shear stress that causes exitbend angle while the bending direction is along with the resultant force of the shear stresses andthe magnitude of the exit angle is directly proportional to the resultant force.The equation re·lating exit bend angle with the resultant force was set up and experiment verification of theequation was carried out with rational agreement to theoretical results.     

高压射流雾化性能实验分析

利用高压射流雾化系统，观测了不同条件对射流雾化形态的影响，并对射流雾化规律进行了分析。其结果参于再生式液体发射药火炮弹道性能稳定性控制具有指导意义。     

德士古渣油气化炉冷态浓度分布的测试与研究

采用双通道喷嘴，在直径1000mm和高4000mm的大型冷模装置上，对德士古渣油气化炉冷态浓度分布进行了测试和研究，考察了喷嘴中心与环隙射流动量比对宏观混合过程的影响，给出了无因次径向浓度分布，无因次最大浓度和混合分数的轴向衰减以及无因次浓度半半径沿轴向的变化规律。     

国产磨料的杂质及研磨对硅片的污染分析

本文研究了国产磨料的成分、杂质和磨料、磨具对硅片的污染,分析了铁对硅器件的危害,提出了减少污染的方法.     

后混合磨料水射流切割石材的特性

对后混合磨料水射流切割石材特性进行了理论和实验分析，并探讨了磨料水射流切割石材的切割机理，分析了改变切割工艺参数对切割深度的影响特性，最后对石材切割的表面形貌进行了论述和分析。