浓缩型入口下排气旋风分离器流场和性能的数值计算

运用CFD方法,对浓缩型入口下排气旋风分离器内的气固两相流动进行了研究。计算中气相采用RNGk-ε湍流模型,颗粒相采用拉格朗日坐标系下的离散相模型。重点计算了分离器流场、分离效率及其阻力特性,结果表明,采用浓缩入口后分离器内流场发生明显改变,分离器上部切向速度明显提高,有利于大颗粒的分离。同时通过对不同浓缩结构旋风分离器的分离效率和阻力特性进行分析比较,为工程设计提供了依据。     

出口小家电产品环境适应性试验中常见问题及分析

本文介绍了小家电产品在环境检测中常见的安全问题,分析其通常存在的不符合IEC标准的条款和产生的原因,提出了解决类似问题的措施,从而提高出口小家电产品的安全性能.     

影响脱硫塔性能的因素分析与研究

湿法烟气脱硫是成熟且具有较好发展前景的工艺,其中关键是对脱硫塔的选择及通过各项参数的控制达到良好的脱硫效率.通过对脱硫塔酸碱度(PH)、气液比(L/G)、流场特性、结垢等各种性能进行分析研究,对脱硫塔的选择和实际运行具有一定的指导意义.     

高压输电线路环境影响评价模拟类比研究

本文按照《规范》对高压输电线路工程环境影响评价模拟类比的说明,结合对输电线路下方形成的工频电磁场和无线电干扰值的理论计算,通过分析影响线路下方工频电磁场、无线电干扰强度及空间分布的因素,总结出几点关于类比线路选取方面的经验,为今后电磁环评中模拟类比线路的选择提供依据和参考。     

街道峡谷内汽车排放污染物浓度分布的观测与数值模拟

在上海某典型街道峡谷内按一定的空间布点,在一定时段内同时对各布点进行采样并做一氧化碳浓度分析,同时记录车辆种类、车流量、气象条件等,分析街道峡谷内污染物浓度的分布.运用风向频率加权(WDFW)方法,结合大气流动和污染物扩散的CFD模型进行数值模拟计算.结果表明,数值模拟结果和现场观测结果较吻合,建筑物低的一侧污染物浓度远高于建筑物高的一侧污染物浓度,两侧的污染物浓度随着高度的增加而降低.     

强磁场影响下菌株B1对染料的脱色作用

从校园土壤中筛选出一株对人工合成染料酸性红B有一定脱色能力的菌株B1(芽孢杆菌属),经过6.0、8.0、8.0T的强磁场分别作用30、15、30 min后进行了脱色试验;根据实验数据,得到染料脱色模型.结果表明,强磁场对B1具有诱变作用,能使其脱色能力得到强化.     

染料废水电催化氧化及降解动力学研究

以新型钛基二氧化铅电极为阳极、石墨为阴极、活性炭-纳米二氧化钛为催化粒子电极降解染料模拟废水酸性红B溶液,考察了槽电压、pH值、催化剂量等对处理效果的影响。实验结果表明:纳米二氧化钛催化剂的催化效果显著,该反应器能够有效的降解酸性红B,降解机制主要是电致H2O2、.OH对有机物的氧化、降解。同时用一级反应拟合了酸性红B溶液COD去除反应,由实验数据确定了反应动力学方程。     

Mass transport model of ions within biofilms under the effect of external field

A mass transport model was developed to predict the transport rate of ions within biofilms, which was experimentally verified using the fluxes of NH4^＋ and Ca^2＋ through the heterotrophic biofilms with the thickness varying from 230 to 1430μm under the effect of external field in the range of-20 V/m to 60 V/m. It is found that the result predicted by the model is in agreement with the experimentally obtained one, with the error less than 5 percent for the thin biofilms. The error increases with the increase of the biofilm thickness. The transport rate of ions caused by electric migration is affected by the charges, field strength, and biofilm thickness and so on.     

热阻力概念的修正及计算方法

以隧道火灾为背景,对一维加热管流中的热阻力进行了研究。通过压力场数值模拟与理论分析,直接证实了热阻力的存在,并表明传统概念上的热阻力明显大于实际的能量损失。根据能量方程提出水平无粘管流的热阻力应等于气流经过加热区的全压力降,而非静压力降;等截面管流的热阻力大小应为传统热阻力值的1/2。这一修正使热阻力概念具有了严格的流体力学意义。在定义新的热阻力系数基础上,建立了2个热阻力系数表达式及低马赫数条件下热阻力的近似表达式。将该近似表达式与热损失方程进行对比,表明两者在低马赫数条件下具有一致性。研究成果进一步发展了热阻力理论体系,对隧道火灾及其它相关工程热物理问题的研究与应用都具有重要价值。     

Numerical study on premixing characteristics and explosion process of starch in a vertical pipe under turbulent flow

Fire and explosion accidents are frequently caused by combustible dust, which has led to increased interest in this area of research. Although scholars have performed some research in this field, they often ignored interesting phenomena in their experiments. In this paper, we established a 2D numerical method to thoroughly investigate the particle motion and distribution before ignition. The optimal time for the corn starch dust cloud to ignite was determined in a semi-closed tube, and the characteristics of the flame propagation and temperature field were investigated after ignition inside and outside the tube. From the simulation, certain unexpected phenomena that occurred in the experiment were explained, and some suggestions were proposed for future experiments. The results from the simulation showed that 60–70 ms was the best time for the dust cloud to ignite. The local high-temperature flame clusters were caused by the agglomeration of high-temperature particles, and there were no flames near the wall of the tube due to particles gathering and attaching to the wall. Vortices formed around the nozzle, where the particle concentration was low and the flame spread slowly. During the explosion venting, particles flew out of the tube before the flame. The venting flame exhibited a “mushroom cloud” shape due to interactions with the vortex, and the flame maintained this shape as it was driven upward by the vortex.