共查询到18条相似文献，搜索用时 953 毫秒
1.
本文对侧伸式高浓度厌氧反应器流场进行了数值模拟,计算采用多重参考系法和标准k-ε湍流方程。模拟结果表明,由于高浓度流体具有牛顿流动特性,流体只在反应器底部形成了循环流动,在整个反应器内的湍流特性分布不均匀。在相同条件下,牛顿流体能够形成整体循环,湍流特性比较均匀。 相似文献
2.
3.
4.
对微型燃气轮机旋流燃烧室内湍流流动PIV测量中产生的非轴对称性误差的原因进行了分析,提出了基于CFD技术的旋流燃烧室内湍流流动PIV测量误差的修正方法,将修正后的实验数据与数值计算结果进行了比较,结果表明,该修正方法可以有效地减小旋流燃烧室内湍流流动PIV测量中产生的非轴对称性的误差。 相似文献
5.
应用确定性混沌分析技术,初步研究了下喷自吸环流反应器内气－液两相流动的时序压力波动的局部混沌特性．结果发现,在本文实验条件下,该反应器内局部最大李雅普诺夫指数值均大于零,并且呈现出与局部分形维数类似的分布规律．这些结果表明,该反应器内的流动行为呈现混沌特性,可以应用诸如局部最大李雅普诺夫指数和局部分形维数等局部非线性特征参数从更深层上揭示多相反应器内的流动特性,例如流区过渡及流动结构等． 相似文献
6.
文章以冶金多相反应器内的分散相为研究对象,分析了分散相产生的条件及其在湍流连续相中的运动特性。研究结果表明：经适当假设后,分散相在连续相中的运动可由一阶线性方程描述;湍流反应器内分散相的数量、尺度影响其在连续相中的分布,其数量越多,尺度越大,则分布越不均匀;当分散相与连续相扩散系数相同时,它们之间的运动没有滞后,利于渣-金间的混合。应用现有湍流研究成果可以为优化此类反应器的工艺参数提供有益的参考。 相似文献
7.
对下喷自吸环流反应器内气－液两相流和气－液－团三相流体系的液相局部流动特性进行了实验研究．用改进皮托管对液相瞬时速度进行了测量，并借助湍流统计理论对渡相平均速度、液相湍动速度和湍动微尺度等液相局部流动参数进行了统计分析和处理，着重讨论了喷射液体流量和固体粒子加入量分别对喷射有效区和导流筒内管流区液相局部流动参数的影响． 相似文献
8.
应用重标度范围（Ｒ／Ｓ）分析技术和吸引子重构技术,初步研究了下喷自吸环流反应器内气－液－固三相流动的时序压力波动的局部分形维数和局部最大Ｌｙａｐｕｎｏｖ指数特性．结果表明,在喷射有效区和导流筒内管流区,分形维数和最大Ｌｙａｐｕｎｏｖ指数均随喷射液体流量和固体颗粒加入量的增加而增大,且局部分形维数与最大Ｌｙａｐｕｎｏｖ指数的分布规律相似．在本文实验条件下,反应器内最大Ｌｙａｐｕｎｏｖ指数均为正值,表明该反应器内的流动行为呈现混沌特性．局部分形维数和局部最大Ｌｙａｐｕｎｏｖ指数等局部非线性表征参数可用来从更深层上揭示三相环流反应器内的流动特性,例如流区过渡及流动结构等． 相似文献
9.
〖JP2〗现有商业计算软件对燃烧室内的燃烧流场进行计算时存在精度不高、非开源、不可扩展等问题,难以满足工程设计需要。在前期完成冷态雾化模拟基础上,开发了基于开源计算平台OpenFOAM的燃油雾化燃烧求解系统,构建〖JP〗大涡求解器,对加州大学伯克利分校测量的液雾两相燃烧实验进行了数值模拟。通过计算得出液滴温度维持在350K左右,表明模拟效果较符合燃烧流场温度变化,系统能较好地展示湍流燃烧流动的反应特性,符合工程研究需要。 相似文献
10.
11.
In this paper, the characteristics of fluid mixing time in a novel extra-loop fluidized bed were studied. The results showed that the mixing time was shortened with the increase of fluid velocity. All the discrete numbers of the reactor were above 0.2. The serial number n was 2.5 -3.0. It was judged accordingly that the reactor fluid state was continous stirred tank reactor （CSTR） mainly. When the inspiratory capacity increased the mixing time of the reactor was shortened. Thus the air input was beneficial for the fluid mixing. During the three phases mixing process, the mixing time of the reactor could be decreased by the n increase of carrier and air loading together, but the change was not significant. The parameters affecting the reactor fluid state were fluid velocity, inspiratory capacity and carrier. KLa could be increased with the air loading increase, and at the same gas/liquid ratio when the pressure drop was high, KL~ value was increased. The amount of carrier complex influence on KLa. As the carrier loading continued to increase, its value had been dropped but the changes was not significant, and optimization condition was found at above 800 1 000 g carrier loading （pouzzolane） or 600 g PVC. Under gas/liquid ratio of 0.8% -5.2%, KLa was （0.62-1.37）×10^-2· s^-1. 相似文献
12.
综合讨论了厌氧折流板反应器(ABR)工艺特征,阐述了国内外关于ABR启动及实际应用的研究现状。认为ABR具有耐冲击负荷、对有毒物质适应性强、固液分离效果好等显著特点。因此,ABR作为一种新型高效生物处理技术,在我国废水处理中,特别是对高浓度有毒工业废水处理具有良好的研究开发价值。 相似文献
13.
An expanded granular sludge bed (EGSB) reactor inoculated with anaerobic granular sludge was started up with its COD removal performance, self-balancing of pH, biogas production rate and characteristics of the granular sludge during the start-up period being investigated. The results indicated that the EGSB reactor can be started up successfully in 27 d by increasing the organic loading rate rapidly. The removal efficiency of COD was maintained above 93% with influent COD concentration of 25 000 mg/L and OL... 相似文献
14.
To understand the absorption mechanism of nitrogen dioxide into a sodium sulfide solution, a stirred tank reactor with a plane gas-liquid interface was used to measure the chemical absorption rate of diluted nitrogen dioxide into sodium sulfide solution. The absorption rates under various experimental conditions were measured and the effects of experimental conditions on nitrogen dioxide absorption rate were discussed. The results show that, in the range of this study, nitrogen dioxide absorption rate increases with increasing sodium sulfide concentration, nitrogen dioxide inlet concentration, and flue gas flow rate, but decreases with increasing reaction temperature and oxygen content in flue gas. 相似文献
15.
16.
Absorption of NO2 into Na2S solution in a stirred tank reactor 总被引：1，自引：1，他引：0
To understand the absorption mechanism of nitrogen dioxide into a sodium sulfide solution, a stirred tank reactor with a plane gas-liquid interface was used to measure the chemical absorption rate of diluted nitrogen dioxide into sodium sulfide solution. The absorption rates under various experimental conditions were measured and the effects of experimental conditions on nitrogen dioxide absorption rate were discussed. The results show that, in the range of this study, nitrogen dioxide absorption rate increases with increasing sodium sulfide concentration, nitrogen dioxide inlet concentration, and flue gas flow rate, but decreases with increasing reaction temperature and oxygen content in flue gas. 相似文献
17.
研究了双峰中密度聚乙烯(BMDPE)与纳米碳酸钙不同配比复合物的流变行为与力学性能.讨论了复合物的组成、剪切应力和剪切速率以及温度对熔体粘度和膨胀比的影响,测定了不同配比熔体的非牛顿指数(n)、熔体流动速率(MFR)、粘流活化能以及习用屈服应力,断裂应力和断裂伸长率,用扫描电镜观察了纳米碳酸钙在复合材料中的分散情况.结果发现:纳米碳酸钙可以均匀地分散在BMDPE中,少量的纳米碳酸钙就可以明显提高材料的力学性能,在较高的剪切速率下还可以改善材料的加工性能. 相似文献
18.
采用自行设计的发酵装置,通过温度对挥发性脂肪酸的影响,从而进行了消化温度对柠檬果渣厌氧消化过程中产气量的影响研究．实验表明,在中温（35℃）和高温（55℃）两种消化条件下及pH接近中性时,柠檬果渣消化反应器分别于第7天和第5天开始进入产甲烷阶段,最高产气量分别为44mi和46mi,高温比中温的产气量提高了4．5％．由此可见,高温消化比中温消化缩短了消化时间,提高了产气量,高温消化是提高柠檬果渣厌氧消化产气量的有效方法． 相似文献