Applicability and Structure Optimization of Cyclone Separator Based on Numerical Simulation

旋风分离器是一种利用气-固两相流体的涡旋运动使固体颗粒在离心力的作用下从气流中分离出来的设备，它具有结构简单、操作维护简便、制造安装价格低等优点，被广泛应用于石油、化工、冶金等领域。由于其内部流场具有强旋流湍流特征，气流和颗粒的运动十分复杂，传统的实验方法很难深入研究其内部流场规律和分离机理，随着计算流体动力学的发展，数值仿真分析成为研究旋风分离器的主要手段。 旋风分离器的工况和结构参数会对其性能产生决定性影响。对于一个给定的旋风分离器，其工况参数包括颗粒半径、颗粒密度和入口速度，由于工况参数可以在一定范围内变化，因此需要讨论分离器的适用性，为分离器在不同工作环境下工作参数的选择提供理论依据...Cyclone separator is a kind of equipment that uses rotary motion of gas-solid two-phase fluid to make the solid particle separated from the gas flow by centrifugal force. Their simple design, operational and maintenance conveniently, low manufacturing costs make them widely used in the fields of petroleum, chemistry, metallurgy. Because the internal flow has strong vortex turbulence characteristic...学位：工学硕士院系专业：物理与机电工程学院_机械制造及其自动化学号：1992012115273

Simulation analysis of separation efficiency of cyclone separator under different conditions

针对旋风分离器的适用性问题,研究了不同工况条件下各工作参数对分离效率的影响。选择了环境参数为固体颗粒粒径和密度,分离器工作参数为进口速度,基于fluEnT运用rng k-ε模型模拟旋风分离器内气相紊流,采用了离散相模型(dPM)模拟固相流场颗粒轨迹。由于粒径、密度和进口速度分别变化具有多种组合,为此引入了正交试验法以图减少仿真的次数。讨论了在不同颗粒粒径和颗粒物密度条件下旋风分离器的进气口速度与分离效率之间的关系。研究结果表明,在不同工作环境下旋风分离器工作参数对分离效率有着重要的影响。Aiming at the cyclone separator' s applicability,the separation efficiency affected by working conditions was studied.The solid particle size and density were selected as environment parameters and the inlet velocity as working parameters.Based on FLUENT,the RNG k- ε model and discrete phase model( DPM) were used to simulate the turbulent flow of gas phase and particle trajectory of solid phase respectively in cyclone separator.Because the particle size,density and inlet velocity change respectively will produce a variety of combinations,the orthogonal test method was introduced to reduce the number of simulation.The relationship between the cyclone separator inlet velocity and separation efficiency was discussed under different particle size and density.The results indicate that working parameters of cyclone separator has significant influence on the separation efficiency in different environment

装配机器人视觉定位系统的研究

建立视觉定位系统,用于工业机器人对工件的精确定位,从而引导机器人完成精确的装配动作。介绍了此装配机器人的系统结构并着重分析了视觉定位系统,推导了摄像机参数标定算法公式,并用MATlAb标定工具箱求解,重点分析推导了工件圆心的定位算法。在有无视觉定位系统的两种情况下,对工件同一装配位的到位情况做重复性试验。实际应用证明工业机器人与视觉定位系统相互协作的模式是可行和稳定的,能满足工业现场对装配精度的要求

基于回归正交试验的旋风分离器结构优化研究

针对旋风分离器多结构参数变化,选取影响旋风分离器性能较大的4个结构参数作为优化变量:圆柱体高度H/D、排气管直径d/D、排气管插入深度h/D、锥体高度He/D。以回归正交试验法为实验方案,做36组仿真模拟实验。采用湍流计算的雷诺应力模型(RSM)进行气固两相流场数值模拟,并用拉格朗日法追踪固体颗粒的运动轨迹;在此基础上分别建立了旋风分离器压降和分离效率对其结构参数的回归数学模型;根据回归数学模型针对结构参数对旋风分离器的压降和分离效率的影响程度进行了分析,得出影响压降的最主要因素是升气管直径(随着升气管直径增大压降显著减小)、影响分离效率的最主要因素是升气管直径和锥体段高度

Design of Intelligence Electricity-economized Device of Air-condition

针对空调、冰柜等家用高能耗制冷设备,开发一种新型空调智能节电器;该节电器根据地区气候区划的不同,选择相应节电模式;同时,根据一天24H室内外昼夜温差的变化规律,自动调整节电率,优化压缩机运行曲线,充分利用制冷剂的余冷,实现对空调、冰柜等压缩机设备的优化控制,达到节约电能的目的;另外,在温度检测模块的作用下,控制室内温度不超过预先设定范围,保证节电与人体的舒适度;节电器硬件电路以8位微处理器为核心,外接瞬态型SC2272-M4遥控解码芯片、开关电源、实时时钟、温度检测等模块;软件设计主要由初始化、键码采集、按键处理、参数保存、温度检测、压缩机控制等部分构成;经测试,节电器制冷与制热节电率分别达到27%和22%,市场应用前景广阔。Air-condition intelligence electricity-economized device is a new electricity saving product, which is developed in view of high energy consumption refrigeration equipment, such as air-condition, refrigerator.This device can modify the electricity-economized mode by the change of region, climate, time and temperature.It optimizes the air-condition's operating curve and makes the best of the over-plus cold or heat air , decreasing the starting times of the compressor system to realize the electricity saving control of the air-condition and refrigerator.The hardware is composed of MCU HT48R70A-1, transient remote control decoding chip SC2272-M4, power integration, digital thermometer, etc.Software includes initialization, key gathering, key processing, parameter preservation, displaying and compressor control, etc.The electricity-economized rate of refrigeration and heating respectively achieves 28% and 21% by test, and it has a broad market application prospect.福建省科技计划重点资助项目(2008HOO60

不完全性脊髓损伤患者主要照顾者负性情绪与创伤后成长的纵向研究

目的探讨不完全性脊髓损伤患者主要照顾者在其治疗不同时期负性情绪与创伤后成长的纵向变化及二者之间的关系。方法以不完全性脊髓损伤患者主要照顾者76例作为研究对象,采用心境和焦虑症状问卷、创伤后成长量表在术前、术后进行问卷调查。结果心境和焦虑症状总分术后三个月(50.34±3.46)与术前(57.23±9.06)、术后一周(56.89±9.03)相比有显著差异,术后一个月心境和焦虑症状总分(52.30±9.05)与术后一周(56.89±9.03)相比有显著差异,差异有统计学意义(P<0.05);术后三个月创伤后成长总分(62.43±11.03)与术前(56.72±12.75)、术后一周(58.71±14.63)相比有显著差异,术后一个月创伤后成长总分(60.12±14.48)与术后一周(58.71±14.63)相比有显著差异,差异有统计学意义(P<0.05)。结论负性情绪各维度与创伤后成长相关。负性情绪各维度与创伤后成长总分、新的可能性、个人力量、自我转变相关

要勇敢面对一流本科教育这个世界性难题(笔谈)

本科教育是培养高层次人才的根本,也是培养科学创新型人才的起点。"双一流"建设背景下,建设一流本科教育日益成为社会共识,因为一流本科教育是一流大学之基。一流本科教育离不开高质量教学,高质量教学相信学生具有理性探究能力,只有坚持平等性、建构性和个性化原则,把能力培养作为教学的中心任务,才能进行有效的教学创新。合作学习是教学生态重建的抓手,也是提高教学质量、促进教学创新的一个重要向度。高质量教学需要可靠的保障机制,学生课程评估已成为高校教学质量保障体系的重要一环。但课程评估的主要目标是通过反馈以帮助教师改进教学,而不是对教师教学质量实施"监控"。一流本科教育最根本的标志是能够培养出一流人才,对"拔尖学生"的培养自然而然就成了人们关注的一个重点,学习投入、学习方法、学习情绪等"过程性指标"应成为关注的核心。一流人才的培养需要教学和科研发挥各自优势,协同育人。同时,一流本科教育依赖于一流的专业教育,一流的专业教育必须实现对传统专业教育模式的超越。教育部人文社会科学重点基地重大项目“中国特色的大学治理结构与质量保障机制建设研究”(项目编号:18JJD880005);教育部人文社会科学重点研究基地重大项目“经济新常态下的教育财政研究”(项目编号:16JJD880002)国家社科基金教育学一般项目“‘创新战略’背景下中国一流大学‘拔尖计划’本科生的深层学习研究”(BIA180169);国家社科基金“十三五”规划(教育类)一般课题“‘双一流’建设大学教学和科研协同育人机制研究”(项目编号:BIA180163)山东省高等教育改革与发展研究院重大委托项目“中国特色高等教育质量治理体系建构研究

Chlorofullerenes featuring triple sequentially fused pentagons

通讯作者地址: Tan,YZ(通讯作者),Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 2. Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Xiamen 361005, Peoples R China 电子邮件地址: [email protected], [email protected] triple sequentially fused pentagons (TSFP) motif is one of the basic subunits that could be used for constructing fullerenes, but it violates the isolated pentagon rule (IPR) and has not been found in carbon cages to date. The properties of TSFP-incorporating fullerenes are thus poorly explored both theoretically and experimentally. Reported herein are four chlorinated derivatives of three different fullerene cages, all with the TSFP motif. X-ray crystallographic analyses indicate that the molecular strain inherent to the pentagon adjacency of a TSFP is significantly relieved upon exohedral chlorination, leaving one of the four pentagon fusion sites unsaturated and rendering the present derivatives chiral. This unique reactivity, in stark contrast to that of previously reported non-IPR fullerenes containing double fused pentagons or triple directly fused pentagons, can be rationalized by density functional theory calculations, and are expected to stimulate further studies of these new members of the fullerene family, both theoretically and experimentally.NNSF of China 20525103,20531050,20721001,20423002 20673088 973 Program 2007CB81530

Two I-h-symmetry-breaking C-60 isomers stabilized by chlorination

通讯作者地址: Xie, SY (通讯作者), Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] abiding surprise in fullerene science is that I-h-symmetric buckminsterfullerene C-60 (ref. 1) (I-h-C-60 or C-#1,812(60), the nomenclature specified by symmetry or by Fowler's spiral algorithm(2)) remains the sole C-60 species experimentally available. Setting it apart from the other 1,811 topological isomers (isobuckminsterfullerenes) is its exclusive conformity with the isolated-pentagon rule(3), which states that stable fullerenes have isolated pentagons. Although gas-phase existence of isobuckminsterfullerenes has long been suspected(4-7), synthetic efforts have yet to yield successful results. Here, we report the realization of two isobuckminsterfullerenes by means of chlorination of the respective C-2v-and C-s-symmetric C-60 cages. These chlorinated species, (C60Cl8)-C-#1,809(1) and (C60Cl12)-C-#1,804(2), were isolated in experimentally useful yields. Structural characterization by crystallography unambiguously established the unique pentagon-pentagon ring fusions. These distinct structural features are directly responsible for the regioselectivity observed in subsequent substitution of chlorines, and also render these unprecedented derivatives of C60 isomers important for resolving the long-standing puzzle of fullerene formation by the Stone-Wales transformation scheme(8-11).NNSF of China,20525103 ,20531050 ,20721001 , 20571062 ,20425312 973 Program 2007CB81530