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针对煤矿轴流通风机叶片断裂的情况,运用高倍扫描电镜的试验观察方法,进行了叶片断口分析。建立了通风机叶轮叶片的三维模型,采用有限元仿真的方法完成了叶轮的模态分析及应力分析,提取了不同振型下的振动频率。该分析方法为叶片的强度优化设计提供了依据,对振动噪声控制具有重要参考意义。 相似文献
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为了研究3种进气型式对风机内部瞬态流场的影响,采用SST k-ω湍流模型结合自动近壁面处理方法,对包括进气风道在内的压入式矿用对旋主通风机装置全流道内的三维流动进行数值模拟,并应用FFT技术对风机叶轮内部的瞬态压力变化进行频谱分析,得到叶轮流场内部的压力脉动频谱。分析结果显示,相对于无畸变进气型式,弯管畸变与复杂畸变进气型式严重恶化了对旋风机叶轮上游进气风道内的流场,从而显著降低了风机的性能;而且,第二级叶轮内部流场的压力脉动幅值最大,气流沿周向的流动不均匀性增加。 相似文献
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在进行煤矿局部对旋式轴流通风机机械设计的过程中,根据孤立翼型设计方法完成前后两级叶轮及叶片的设计,在完成集流器、整流罩和扩散筒等主要部件设计后完成整机的机械设计。之后采用有限元仿真方法对风机集流器、整流罩、扩散筒和内筒表面的压力分布进行仿真分析,主要分析其表面的压力分布趋势。通过在矿井通风机设计过程中将有限元仿真方法应用到风机主要结构部件设计过程中,提高了设计的可靠性,具有重要的指导意义和应用价值。 相似文献
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《矿业工程研究》2018,(4)
矿用对旋式轴流通风机因其流量大、效率高、安全可靠等特点,在矿山通风领域中应用十分广泛,本文以矿用对旋式轴流通风机为研究对象,首先运用三维Solidworks软件构建不同风机轮毂比的矿用对旋式轴流通风机三维几何模型,然后利用计算流体力学软件Fluent分析不同风机轮毂比对矿用对旋式轴流通风机气动性能的影响,结果表明:随着矿用对旋式轴流通风机轮毂比的增大,矿用对旋式轴流通风机的全压会先增大而后减小,而矿用对旋式轴流通风机的效率会不断增大.通过进一步对比不同轮毂下的矿用对旋式轴流通风机内部三维流场的流动状况可知,当轮毂比为0.6时通风机三维流场的流动状况更为理想.研究结果对矿用对旋式轴流通风机的优化设计具有重要的指导意义. 相似文献
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流动显示技术是流体力学和空气动力学研究中常用的重要实验手段,把流动显示实验方法中的油流显示技术应用到轴流风机内部流动研究中,成功地捕捉到了轴流风机中的流动分离线及其二次流动的流动现象。使我们可以通过简单易行的表面油流显示技术来取得复杂流动现象中许多重要的信息。 相似文献
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针对矿用两级轴流式通风机建立整机几何模型,选用非结构化网格,通过求解三维N-S方程对其全流场进行了数值模拟。主要分析了通风机内部特定面处的压力场、速度场及涡量场的分布,揭示了轴流式通风机内部流场的基本特性。数值模拟结果可为通风机的设计参数优化和内部流动优化提供参考,对提高轴流式通风机的整体性能和运行安全性具有重要的工程应用价值。 相似文献
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O. Sammarco 《Mine Water and the Environment》1999,18(1):75-80
This paper describes characteristics of tailings ponds, highlighting situations and events that weaken such facilities, and
provides a method for calculating the destructive capacity of tailings flow slides from failed facilities. There are generally
two classes of failures. The first type is caused by water flowing over the tailings, causing erosion and transportation of
the material (overtopping), as well as by piping, which weakens the mechanical characteristics of the dam fill. In such cases,
the eroded material is progressively deposited down-gradient. In the second class, dam failures can produce violent flow slides
that rush downhill and cause devastation. This extreme effect is caused by liquefaction of the material contained in the ponds
and/or the dams, with failure of the latter. The consequences of the flow slide are considered by making comparisons between
the pressure the flow exerts on downstream structures, and the pressures required to cause such structures to collapse. Some
precautionary measures are proposed to limit damages if failure occurs. Given the similarity between such failures and other
landslides, it may also be desirable to apply the measures suggested here to natural slopes. 相似文献
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露天矿传统车流规划以路径最短为基础,没有考虑路段通过能力和路段拥挤程度,车流规划结果存在超过路段通过能力的隐患。为了解决这一问题,以Wardrop均衡原理为理论依据,综合考虑路段车流、路段通过能力的影响,引入综合路阻理念,建立了露天矿车流路网均衡分配模型,实现了在传统车流规划结果基础上对路段车流进行再次优化。实验结果表明,路网均衡分配模型在不考虑路段综合路阻时,其分配结果与传统车流规划一致;当考虑综合路阻时,各路段的车流行驶总时间最小,有效避免了路段拥堵,实现了对卡车调度进一步优化,证明本模型具有更强的通用性和实用性。 相似文献
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C. M. Evertsson 《Minerals Engineering》1999,12(12):1479-1499
The possibility to simulate and predict cone crusher performance is of great interest for the development of crushers as well as for the design and optimization of crushing plants.To calculate the output from a cone crusher, models for size reduction and flow are needed. The interaction between these two models is quite complex as the overall size reduction in a cone crusher is a result of a repeated consecutive comminution process. The flow model is important since it describes how the rock material moves through the crusher chamber. Thereby the flow model provides input to the size reduction model. In turn, the size reduction model predicts the size distribution after compressing the rock material.Previously presented flow models have only in a simplified way described the material flow. In the present paper the way an aggregate of particles moves down a crusher is described based on the equations of motion. A constitutive relation between size distribution and the uncompressed bulk density of the material is presented. Along with compatibility conditions from the crusher geometry, mass continuity is preserved. This is a very important aspect of flow modelling.Three different mechanisms are assumed to describe the material flow: sliding free fall and squeezing. For a single particle only one of these three can be active at a time. Sliding occurs when a rock particle is in contact with the mantle and slides downwards. If the mantle accelerates away rapidly enough, the corresponding particle will fall freely. When a particle comes into contact with both mantle and concave or when the density of a material volume exceeds a critical value, squeezing will occur. During squeezing, particles will be compressed and thereby crushed.The flow model provides detailed information about how different machine parameters affect the flow of the rock material through the crusher chamber. From the model it can be explained why crushers with smaller inclination of the mantle require a larger stroke compared to the ones with steep inclination. 相似文献