【摘 要】
：
采用高速图像采集方法,研究了不同节距比时以旋转正方形排列的错列管束间气液两相流旋涡的演化特性,通过动态图像重建了旋涡生成、卷吸及聚合过程,分析了旋涡演化机理,并运用
论文部分内容阅读
采用高速图像采集方法,研究了不同节距比时以旋转正方形排列的错列管束间气液两相流旋涡的演化特性,通过动态图像重建了旋涡生成、卷吸及聚合过程,分析了旋涡演化机理,并运用时间序列图像相关性对比分析了旋涡脱落的周期特征.结果表明:随着节距比的增大,斯特罗哈数增大;随着含气率的增大,斯特罗哈数减小;当含气率大于0.14时,不存在周期性旋涡脱落现象;随着雷诺数的增大,旋涡脱落频率增加.
Using high-speed image acquisition method, the evolution characteristics of vortexes of gas-liquid two-phase flow between staggered tube bundles arranged in a rotating square at different pitch ratios were studied. The vortex generation, entrainment and polymerization processes were reconstructed by dynamic images, and the vortex evolution And the periodic characteristics of vortex shedding were analyzed by using the correlation of time series images.The results show that the Strobel number increases with the increase of the pitch ratio, When the gas content is more than 0.14, there is no periodic vortex shedding phenomenon. As the Reynolds number increases, the vortex shedding frequency increases.
其他文献
The phytohormone abscisic acid (ABA) plays crucial roles in plant development and plant responses to environmental stresses.Although ABA receptors and a minimal
为了减少导航星表的存储容量和提高星图识别的成功率,提出了一种将P向量与三角形内切圆相结合的快速全天自主星图识别算法。该算法在构造导航星表过程中,从天文星表中挑选出
对前缘钝化后的乘波体在非设计状态下的气动性能进行了研究。乘波体的生成基于三维粘性流场,以乘波体上表面底部基线为参数化几何建模对象对乘波体进行设计和优化。采用改进
目的 利用多状态Markov模型对社区老年人轻度认知损害(MCI)转归进行研究.方法 通过MCI患者智商(IQ)变化反映随访人群认知功能的变化趋势,构建一个四状态模型,采用多状态Marko
Background Autosomal recessive polycystic kidney disease (ARPKD) is a rare inherited disease,which is a disorder with multiple organ involvement,mainly the kidn
We investigated the anti-tumor effects of dual cancer specific-oncolytic adenovirus Ad-VP on esophageal cancer(EC).The anti-tumor activity of Ad-VP was compared
Background Cardiac resynchronization therapy (CRT) with biventricular pacing improves cardiac function,functional capacity and quality of life in selected patie
Background Safe placement of the screws is a critical aspect of trans-pedicle internal fixation,and little information on in vivo morphology of the cervical ver