In this paper , the two - phase flow behaviors of gas - solid circulating fluidized bed have been first studied by analysing experimental data . then , based on fractal theory wavelet package analysis ( wpa ) de - noising method was used to denoise solids concentration and pressure fluctuation signals . the solids concentration signals have also been investigated by wavelet multi - resolution analysis and wavelet package decompose , contributed to disclose the non - uniform flow structures of gas - solids phase 然后将基于分形理论的小波包消噪方法用于颗粒浓度和压力波动去噪，并对气固流化床中的颗粒浓度信号进行了小波多分辨分析和小波包多尺度分解，从新角度揭示了气固流态化系统的非均匀气固两相流动结构。
The 3d turbulent flow fields around high - speed trains of four kinds of model uain have been calculated by 3d parallel compute program coded with the algorithms presented in this thesis . from the calculation results , the aerodynamic drag of different types of model trains are obtained , some characteristics of the flow field over the high - speed train are analyzed preliminarily such as pressure distribution and diversification , velocity distribution and diversification , and the affections of different train head shape to pressure . velocity , pressure gradient and the like 用三维并行计算程序模拟了四种不同高速列车车型的外流场，获得了不同车型的运行阻力；详细分析了列车附近流场的压力分布及其变化情况，讨论了列车头型对列车通过时产生的压力波动的影响；分析了四种车型外部流场的速度分布规律及其变化情况，分析了列车头部形状对它们的影响。
The simulation shows that the valve throttle area should be little as possible but must be more than 40 % of pipe section area ; when the total length of pipe is same , and the flow quantity is enough , pipe before primary valve should be thin and long , and the pipe after primary valve should be thick and short , the upriver and downriver small pressure fluctuation will badly lead to waterdrammer pressure rising , and spending more time in establishing pressure and flow quantity 仿真表明,阀门过流面积在满足大于管道截面积40 %的条件下应尽可能小;在管道总长一定并满足流量要求的条件下,主阀前应采取长而细的管道,阀后则应采用短而粗的管道;上下游微小的压力波动都会严重增大开关阀门引起的水击,并使压力、流量的建立需要更长的时间。
Author has investigated the air - volume affect the pressure oscillation in piping system from converse viewpoint . when the structure parameters of the air - volume are some certain value , the pressure oscillation in the exit of the piping system is magnified . this idea makes us a new way to design the power source of high pressure water - jet 研究表明：当设计的空气室结构参数(空气室的容积，安装位置等)取某组数值时，管道出口端的压力波动幅值远大于系统输入压力波动幅值，从而为设计高压脉冲水射流的动力源提供了一条新的思路。
In this thesis , flow regime identification and malfunction diagnosis of fluidization were studied with fractal technology , the presented methods for both flow regime identification and malfunction diagnosis were proved of effectivity . main achievements are as following : 1 . fractal brownian motion ( fbm ) was made from gauss noise and compared with pressure fluctuation signal of gas - solid fluidization , which demonstrated the similarity between the fbm and the signal 在通过fbm (分数布朗运动)数据仿真证明了气固流化床压力波动信号与分数布朗运动是相似的基础上，提出了用分数布朗运动来模拟气固流化床压力波动信号，并采用r s分析法从信号时间序列中提取出hurst指数，通过分析信号hurst指数值对流化床流型和结块故障进行了研究。
For sand , glass bean , quartz sand and pvc , pressure fluctuations were measured at different conditions . furthermore , statistics analysis , power spectral density ( psd ) analysis and chaos analysis of pressure fluctuations in gas - solid cfb were conducted . an investigation of the effect of circulating solid flux , superficial gas velocity , height from riser bottom and particle property on the parameters ( e . g 本文测定了河砂、玻璃珠、玻璃砂和pvc四种颗粒在不同固体循环量、不同表观气速、不同轴向高度下的压力波动，进而对气固循环流化床压力波动时间序列进行了统计分析、功率谱分析和混沌分析。
