乙撑双硬脂酰胺喷雾造粒研究

论述了雾化装置离心式喷的工作原理。通过对乙撑双硬酯酰胺（EBS）所用的喷特性的研究,调整了喷嘴内部结构,得到了能够满足粒度要求的喷。同时对喷嘴的设计及应用提出了一些建议。     

小型钨丝电热原子吸收光谱仪的电源

随着对分析仪器的小型化、便携式需求的提高,钨丝电热原子吸收光谱仪在便携式分析仪器方面显示了很大的潜力.为进一步满足现场分析的需要,以单片机为芯片,为小型钨丝电热原子吸收光谱仪的空心阴极灯和钨丝电热原子化器设计稳定的一体化恒流电源;并编写PC机的控制软件,以USB或RS232方式与电源通信,方便控制空心阴极灯和钨丝电热原子化器电流,以及原子吸收过程.以此电路设计的小型钨丝电热原子吸收光谱仪对镉、铅、金和银的标准溶液测试结果为:检出限分别为(0.1,6.0,5.0,0.6)μg/L,相对标准偏差分别为8.2%,5.3%,6.0%和7.2%.测试结果表明:电源很稳定,达到了文献报道的钨丝电热原子吸收光谱的分析性能.     

新型水煤浆喷嘴试验研究与应用

本文提出了一种新型水煤浆喷嘴──撞击式多级雾化水煤浆喷嘴，该喷嘴雾化质量高，气耗率低，防堵性能好，使用寿命长，且具有良好的负荷调节性能。     

多层喷射沉积板坯设备的优化设计

将原始多层喷射沉积板坯设备改为由计算机控制，步进电机驱动，钢丝卷筒结构传动，介绍了该设备的设计思路，实际生产应用表明，优化后的设备操作简单平稳，工作环境良好，制备出的板坯形貌平整，厚薄均匀。     

Laval型雾化器气液流动特性研究

喷嘴出口气流速度和气液质量流率比是影响液态金属雾化效果的两个主要因素。为改善雾化效果,对现有环缝型雾化器进行改进,出口采用Laval型。建立了喷嘴出口速度、气体与金属质量流率的表达式,获得稳定气、液质量流率比的坩埚背压与金属液面高度的关系。通过实验方法建立了采用限制型Laval喷嘴导流管出口负压值与雾化压力之间的关系。     

Microscopic and macroscopic atomization characteristics of a pressure-swirl atomizer,injecting a viscous fuel oil

Combustion of heavy fuels is one of the main sources of greenhouse gases, particulate emissions, ashes, NOxand SOx. Gasification is an advanced and environmentally friendly process that generates combustible and clean gas products such as hydrogen. Some entrained flow gasifiers operate with Heavy Fuel Oil(HFO) feedstock. In this application, HFO atomization is very important in determining the performance and efficiency of the gasifiers.The atomization characteristics of HFO(Mazut) discharging from a pressure-swirl atomizer(PSA) are studied for different pressures difference(Δp) and temperatures in the atmospheric ambient. The investigated parameters include atomizer mass flow rate( _m), discharge coefficient(CD), spray cone angle(θ), breakup length(Lb), the unstable wavelength of undulations on the liquid sheet(λs), global and local SMD(sauter mean diameter) and size distribution of droplets. The characteristics of Mazut sheet breakup are deduced from the shadowgraph technique. The experiments on Mazut film breakup were compared with the predictions obtained from the liquid film breakup model. Validity of the theory for predicting maximum unstable wavelength was investigated for HFO(as a highly viscous liquid). A modification on the formulation of maximum unstable wavelength was presented for HFO. SMD decreases by getting far from the atomizer. The measurement for SMD and θ were compared with the available correlations. The comparisons of the available correlations with the measurements of SMD andθ show a good agreement for Ballester and Varde correlations, respectively. The results show that the experimental sizing data could be presented by Rosin-Rammler distributions very well at different pressure difference and temperatures.     

一种新型液包气雾化喷嘴流场特性的研究

基于CFD技术对一种新型液包气雾化喷嘴内部的气液两相流流场进行了数值模拟,分析了该喷嘴内部气液两相流的流动特性,得到气相和液相入口压力对气液两相流流动特性的影响,并结合试验数据对模拟结果进行了验证.结果表明:当气相和液相入口压力在0.1～0.5 MPa变化时,喷嘴的出口湍流强度随气相和液相入口压力的提高而增大;提高气相入口压力有利于减小雾化粒径;提高液相入口压力有利于提高雾化粒径的均匀性.     

气泡雾化喷嘴雾化射流场性能仿真

研究气泡雾化喷嘴外部射流场的特性问题,由于喷嘴出口处液膜破碎过程的复杂性,有时会影响雾化质量.为了提高雾化性能,提出将雾化过程细分两个子过程,利用FORTRAN语言程序计算液膜破碎过程,得出液滴初始数据,再用计算流体仿真软件Fluent,建立描述气流-液滴两相流动的合理模型,用Realizable κ-ε湍流模型与DPM离散相组合,进行二次雾化过程,并考虑气液两相间的耦合作用以及液滴破碎和碰撞模型,对雾化射流中的液滴粒径SMD沿喷嘴轴向的分布进行仿真,计算结果与实验数据进行比较吻合较好,可为雾化性能的优化提供有效的数据支持.     

Durchsatzverhalten von Hohlkegeldüsen

A semi empirical relationship is proposed for swirl nozzle discharge coefficients. It considers the theoretical background and is matched to an extended own experimental database and to data from manufacturers of industrial nozzles. The equation considers the liquid viscosity and can be used for very different nozzle designs.