共查询到20条相似文献,搜索用时 171 毫秒
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叶片式抛送装置工作时,高速旋转的抛送叶轮所产生的空气流在出料管协助输送物料。为了提高输送效率,采用计算流体力学软件Fluent对叶片式抛送装置内部的三维气流流场进行了模拟,获得了抛送装置出料管气流流场的基本特征。并对出料管处气流速度的模拟值与试验值进行了比较,检验了数值模拟的可靠性。同时,对出料管高度、截面形状等结构参数的不同变化作了对比模拟,得出出料管高度越大,管内气流速度分布越均匀,但平均气流速度越小,可见出料管高度太大不利于输送物料;圆形截面出料管内气流速度分布较均匀且平均气流速度略大,较方形截面和矩形截面管更有利于输送物料。 相似文献
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叶片式抛送装置气固两相流仿真及优化 总被引:2,自引:0,他引:2
为了揭示叶片式抛送装置抛送玉米秸秆切碎段时内部复杂的气固多重耦合流动特性,使用计算流体力学软件fluent中的Eulerian模型对装置内部气固两相流场进行数值模拟。在高速摄像试验验证可行的基础上,对抛送装置的叶片数、叶片倾角及进料口物料体积浓度等参数对气固两相流场以及抛送物料的影响进行了数值分析,结果表明:4叶片较3和5叶片更有利于抛送物料;后倾10°叶片较前倾10°以及径向叶片更有利于抛送物料;进料口物料体积浓度变化仅改变整个区域物料分布浓度,对物料抛送速度影响不大。 相似文献
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叶片式抛送装置气流运动仿真与参数优化 总被引:1,自引:0,他引:1
《机械科学与技术》2010,(10)
为了减少能量损失,提高叶片式抛送装置的抛送效率,采用计算流体力学软件Fluent对叶片式抛送装置内部的三维气流流场进行了仿真,获得了流场气流运动的基本规律及其影响因素。并对计算出的气流速度与试验值进行了比较,检验了数值模拟的可靠性。同时,对其叶片数、叶片倾角等几何参数的不同变化作了对比模拟,得出4叶片、后倾10°叶片更有利于抛送,且适当提高喂料口的位置、减小轴承座处的间隙将有利于减少叶轮区的涡流,从而减少能量的损失,产生更有利于物料抛送的气流流场。 相似文献
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《中国设备工程》2021,(3)
皮带输送机是一种输送过程中物料与输送皮带没有相对运动的输送设备,广泛用于各行各业。对于制丝生产线的主要设备(简称"主机"),都需要物料均匀稳定地输入,有助于产品工艺质量的稳定,物料进入主机主要是通过振动输送机,振动输送机是利用激振器使料槽振动,从而使槽内物料沿一定方向滑行或抛移的连续输送机械,具有良好的匀料功能;然而,当进入振动输送机的物料是通过皮带输送机送入时,进入的物料较集中于振动输送机横截面中部,不利于振动输送机在较短时间能实现横截面上的平铺均匀,很多工厂采用在振动输送机上设置导流板,取得了一定的匀料效果。而本文则是对皮带输送机出料口进行技术改造,增加分料装置,将物料由一路分成三路,均匀分布到下游振动输送机上,为振动输送机能在短时间内达到匀料的目的提供更好的条件。 相似文献
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对管道气体流场模型进行了说明.空气质量传感器安装在滤清器出口的进气管道中,用Fluent仿真软件对模型做流场分析,改变传感器水平方向和垂直方向的安装位置,得出多组速度数据进行比较分析,确定其最优安装位置.仿真结果表明,随着传感器的垂直方向安装位置从管道底部向管道顶部的上移,且水平方向安装位置从滤清器出口向外移,其热电阻表面流场的同一水平方向的速度一致性变好,但垂直方向速度梯度变大,兼顾速度一致性和速度梯度,得到传感器的热电阻处于管道中心垂直往上h,且距离滤清器出口1.3H的优化位置. 相似文献
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Woo Gun Sim B. M. Bae N. W. Mureithi 《Journal of Mechanical Science and Technology》2010,24(10):1981-1988
The characteristics of two-phase flow in a vertical pipe are investigated to provide information for understanding the excitation
mechanisms of flow-induced vibration. An analytical model for two-phase flow in a pipe was developed by Sim et al. (2005),
based on a power law for the distributions of flow parameters across the pipe diameter, such as gas velocity, liquid velocity
and void fraction. An experimental study was undertaken to verify the model. The unsteady momentum flux impinging on a ‘turning
tee’ (or a ‘circular plate’) has been measured at the exit of the pipe, using a force sensor. From the measured data, especially
for slug flow, the predominant frequency and the RMS value of the unsteady momentum flux have been evaluated. It is found
that the analytical method, given by Sim et al. for slug flow, can be used to predict the momentum flux. 相似文献
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This paper and its companion describe an experimental study of some aspects of the upheaval buckling of buried pipelines by means of a small-scale model apparatus. After a discussion of relevant literature, the experimental apparatus is described in detail: it involves a thin-walled steel pipe of diameter 6 mm and length 5 m, buried in a bed of artificial soil. The horizontal and vertical profiles of the pipe are measured by an electrical remote-sensing device. Axial load is imparted to the pipe by a screw arrangement and/or by interior oil pressure; and transverse horizontal loading may be applied through a string and pulley. The arrangements for assaying the resistance of the soil to transverse motion of the pipe are described. Results are presented for several tests involving both axial and transverse loading, and cyclic axial loading. The paper concludes with a short discussion. 相似文献
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为了实现对油气管道应力的实时监测,提出了一种基于电磁技术的管道应力检测方法.在磁机械效应的J-A模型基础上,对铁磁性材料力磁耦合关系进行数学建模,推导出应力与材料磁导率的函数关系;设计管道应力检测系统,并给出了管道表面漏磁信号与材料磁导率、激励电压和线圈匝数之间的数学关系;搭建管道打压实验平台,对管壁切向应力信号与管壁... 相似文献
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Sun Linzhi Luo Yi Zhang Yanan Sun Ping Qin Xinjie Gong ZhenbangPrecision Machinery Institute Shanghai University Shanghai China 《机械工程学报(英文版)》2002,15(4):303-307
An experimental bimorph piezoelectric element (PZT) actuator for small pipe robot is developed. The robot can move in φ20 mm pipe, and can carry a CCD camera for detecting cracks or fine holes on inner surface of pipe. The velocity of the robot can reach 17~22 mm/s for vertical pipe up/down, respectively. Moving principle and its performance characteristics are presented. 相似文献
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INVESTIGATIONINTOTHESPRINGBACKOFPIPEBENDINGUSINGINDUCTIONHEATINGHuZhongQinghuaUniversityXiaFuqingChangzhouPowerRepairworksAbs... 相似文献
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《Flow Measurement and Instrumentation》2006,17(4):207-224
This paper presents a novel measurement method using ultrasonic echo signals on the flow of air–water mixtures. This method has the capability of measuring an instantaneous echo intensity profile along an ultrasonic beam, so it is expected to apply to pattern recognition of two-phase flow. Additionally, this method has an advantage compared with conventional techniques because of the clump-on type. The principle of the flow pattern recognition is based on the delay time and strength of the pulse echo. In this paper, first of all, the transmission of ultrasound through solid plates, which are made of plexiglass and carbon steel, has been investigated and the effective incidence angles for these materials were found. Then, echo signals reflected off a boundary between water and air in a vertical pipe, having a diameter of 50 mm, were obtained using an ultrasound system, and the effects estimated of a two-phase pattern, from bubbly to slug flow, on the signals. In addition, water flows down the inner surface of a pipe as annular flow, and the echo signals then also investigated. 相似文献