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1、附录C关于电旋风除尘器模拟实验报告本文实验室的旋风除尘器在标度下对气体流程领域做了一次详细的实验性调查，从入口分离向排气管输送的报告。这个研究活动的主要目的是对这些工业设备的复杂流程领域的研究来做一个完全的数据集，以便用CFD数字模仿更好的理解的检验。作为工作的引伸，企图被确定的一些设备的重要区域，在那里固相与气相在相对滑动速度下被分散，其起到分离作用。一般，气体通过一台离心通风机被捕捉，其被开闭环路控制。在管口流程线上被插入一个流量测量计，用来测量气体流量，由一个节流孔阀门控制着。在各个实验过程中，流量变化率在1%之内。旋风除尘器在一个密闭的环路下别控制，被捕获的固体颗粒通过排灰装置被排出。
2、有一部分的颗粒有被气流带走，接着到了一个袋式除尘器，是最后的气体清洗阶段。由于吹风机引起的压缩作用，可变的环流最基本的导致气体发热：类型K（铝镍合金）的热电偶被放在流量测量计上方的气流流线上，它的作用是对该阶段的气流温度的测量，当达到热平衡的条件时，可变的动态分析就可以实现了10。在旋风除尘器的边缘条件的气流样本的主要成分被CFD数据检验并且进行了分析，对主要的物理过程的更好的理解。结果各组成成分分别的被报告和分析。在操作条件A下，对旋风除尘器入口和排气管之间的环行空间进行了速度测量，边缘速度的测量，由于光学的可及性，从旋风除尘器的顶盖的产物是非常困难的，因为它的数量级比切线方面要低。探针容量
3、对准线的任意偏差都是以一个正确的体积为基准的，即使非常的小，导致不正确的测量，因为径向上的切线方向增加到光的速度。结果被总结在3（）和4（）中三个低速成分组成的外形对半径为圆柱形分离室的一个坐标进行标态下分析。在现阶段技术上的考虑旋涡核心的气体流程，特别是在旋风除尘器离中心轴近的区域，在旋风除尘器里是不能被知道的，还因为压力运动似乎有一定的周期性，在任意阶段跃进。其他的修正方法已经被提议，但是他们是依靠的是任意选择的截止频率和高数据率的传达，但是在一个旋风气体和耐热玻璃壁就很难传达。在当前的调查，以常规的平均时间为手段的测量，并且分别以rms速度组被推出而得出结论，从1000个极小的速度数据样
4、本中保证统计错误少于（可信度在左右），按平均值和少是rms中的一个。这类型的数据的分析和执行是以生产为目的的，对于商业CFD是数据库中的一个代码。这项任务的结果已经在早期被报告过。附录DAbout the electric whirlwind dust remover simulation laboratory report This paper reports a detailed experimental investigation of the gas flow field within the whole body of a laboratory scale cyclone, from
5、 the inlet chamber to the exhaust duct. Main aim of this research activity was the better understanding of the complex flow field typical of these industrial devices and the achievement of a complete data set useful for validation of CFD numerical simulation, as already reported in a previous paper
6、. As an extension of the work, an attempt was made to determine the relative slip velocity of the dispersed solid phase with respect to the gaseous one in some critical regions of the device, important for separation effects. As it can be seen, the gas stream is fed to the cyclone through a centrifu
7、gal blower (0.1 bar differential pressure) operating in a open/closed-loop circuit. An orifice flow meter is inserted in the feeding line to provide measurement of the gas flow rate, whose regulation is operated by a throttle valve. The mass flow rate was kept constant throughout each experiment wit
8、hin 1%. The cyclone can be operated in the closed-loop mode by feeding solid particles through a loosing weight screw feeder. Separated particles are collected in a mobile hopper below the cyclone, while a bag filter downstream the device allows final purging of the gas phase, which is reticulated t
9、o the cyclone. Owing to work compression effects generated by the blower, the fluid recirculation initially induces gas heating: a type K (ChromelAlumel) thermocouple inserted in the feeding line just upstream the flow meter provided temperature measurement of the gas phase, indicating the reaching
10、of thermal equilibrium conditions, at which fluid dynamic analysis has been carried out10.The gas phase flow pattern has been analysed inside the main components of the cyclone to provide boundary conditions and validation data for CFD code development, and a better understanding of the main physica
11、l processes. The results are reported and discussed for each component separately.Velocity measurements have been performed in the operating condition A inside the inlet annular space between the cyclone body and the gas exhaust duct, along two orthogonal directions indicated as and at different dep
12、ths (and 105 mm). The measurement of the radial velocity component was limited by the optical accessibility from the top cover of the cyclone and resulted very difficult because its value is an order of magnitude lower than that one of the tangential component. Any deviation of the probe volume alig
13、nment from the correct one, even if very small, leads to incorrect measurements, since the projection of the tangential component on the radial direction adds to the radial velocity. Results are summarized in () and (), where the profiles of the three mean velocity components are plotted versus a ra
14、dial coordinate normalized to the cylindrical chamber inner radius (144 mm).The use of phase averaging techniques of the time dependent flow caused by the precession of the vortex core was considered, particularly for the tangential velocity component near the cyclone axis, but it resulted not feasi
15、ble inside the cyclone body, also because the processing motion is quasi-periodic with random phase jumps. Other correction methods have been proposed, but they rely on the arbitrary selection of a cut-off frequency and the attainment of high data-rates, difficult to achieve in a gas cyclone with Pl
16、exiglas walls. In the present investigation, conventional time averaged measurements of the mean and rims velocity components are reported, as deduced from a minimum sample size of 1000 velocity data to ensure statistical errors less than 3% (at 95% confidence level) in the mean value and less than 6% in the rms one. This type of data analysis was also performed because one of the aims was to produce a
