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基于CMAQ模拟结果，统计、归纳出各种污染物排放控制因子与污染物浓度之间的函数关系，建立空气质量响应曲面模型RSM，通过留一法交叉验证和外部验证对模型进行可靠性验证。使用RSM，研究不同污染物的PM2.5响应值，评估现有政策不变（Ⅰ）和政策收紧（Ⅱ）两种减排情景，发现NOX、SO2、NH3和VOC对PM2.5浓度体现明显的非线性响应特征，情景Ⅱ的减排效果明显好于情景Ⅰ，夏季的减排效果好于冬季。 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＭａｎｙｅｘｐｅｒｉｍｅｎｔａｌａｎｄｎｕｍｅｒｉｃａｌｓｔｕｄｉｅｓｈａｖｅｂｅｅｎｃｏｍｐｌｅｔｅｄｔｏｉｎｖｅｓｔｉｇａｔｅｔｈｅｐａｒｔｉｃｌｅｍｏｔｉｏｎｉｎｔｕｒｂｕｌｅｎｃｅ .Ｐｒｅｖｉｏｕｓｆｌｕｉｄｄｙｎａｍｉｃｓｓｔｕｄｉｅｓｗｅｒｅｃｏｍｍｏｎｌｙｂａｓｅｄｏｎｔｉｍｅ ａｖｅｒａｇｅｄＲｅｙｎｏｌｄｓｅｑｕａｔｉｏｎｓ,ｓｕｃｈａｓｔｈｅｔｗｏ ｅｑｕａｔｉｏｎｍｏｄｅｌ.Ｊｕｓｔｌｉｋｅｔｈｅｃａｒｒｉｅｒｇａｓｐｈａｓｅ,ｔｈｅｐａｒｔｉ ｃｌｅｐｈ… 相似文献
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To find out the detailed characteristics of the coherent structures and associated particle dispersion in free shear flow, large eddy simulation method was adopted to investigate a two-dimensional particle-laden wake flow. The well-known Sub-grid Scale mode introduced by Smagorinsky was employed to simulate the gas flow field and Lagrangian approach was used to trace the particles. The results showed that the typical large-scale vortex structures exhibit a stable counter rotating arrangement of opposite sign, and alternately form from the near wall region, shed and move towards the downstream positions of the wake with the development of the flow. For particle dispersion, the Stokes number of particles is a key parameter. At the Stokes numbers of 1.4 and 3.8 the particles concentrate highly in the outer boundary regions. While the particles congregate densely in the vortex core regions at the Stokes number of 0.15, and the particles at Stokes number of 15 assemble in the vortex braid regions and the rib regions between the adjoining vortex structures. 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＭａｎｙｆｌｏｗｓａｎｄｈｅａｔｅｘｃｈａｎｇｅｓｉｎｅｎｇｉｎｅｅｒｉｎｇｏｃｃｕｒｉｎｃｏｍｐｌｅｘｒｅｇｉｏｎｓ.Ｉｎｔｈｅｓｔｕｄｙｏｆｃｏｍｐｕｔａｔｉｏｎａｌｆｌｕｉｄｄｙｎａｍｉｃｓ,ｔｈｅｇｅｎｅｒａｔｉｏｎｏｆｂｏｄｙｆｉｔｔｅｄｃｏｏｒｄｉｎａｔｅｓｆｏｒｔｈｅｓｅｃｏｍｐｌｉｃａｔｅｄａｒｅａｓｉｓｇｅｎｅｒａｌｌｙａｃｒｉｔｉｃａｌｒｅｑｕｉｒｅｍｅｎｔｆｏｒａｃｃｕｒａｔｅｎｕｍｅｒｉｃａｌｆｌｏｗｓｉｍｕｌａｔｉｏｎｓ.Ａｐｏｏｒｌｙｃｏｎｓｔｒ… 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｍｏｄｅｌｉｎｇｍｅｔｈｏｄｓｏｆｇａｓ ｓｏｌｉｄｆｌｏｗａｒｅｋｎｏｗｎｔｏｉｎｃｌｕｄｅｔｈｅＥｕｌｅｒｉａｎ/ＥｕｌｅｒｉａｎａｐｐｒｏａｃｈａｎｄｔｈｅＥｕｌｅｒｉａｎ/Ｌａｇｒａｎｇｉａｎｏｎｅ.ＴｈｅＥｕｌｅｒｉａｎ/Ｅｕｌｅｒｉａｎａｐｐｒｏａｃｈｔｒｅａｔｓｂｏｔｈｐｈａｓｅｓａｓｓｅｐａｒａｔｅｉｎｔｅｒｐｅｎｅｔｒａｔｉｎｇｃｏｎｔｉｎｕｕｍ ,ｗｈｉｌｅｔｈｅＥｕｌｅｒｉａｎ/Ｌａｇｒａｎｇｉａｎａｐｐｒｏａｃｈｔｒｅａｔｓｔｈｅｇａｓｐｈａｓｅａｓ… 相似文献
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INTRODUCTIONPlanewakeflowisonetypeoffreeshearflowandexistswidelyinnatureandmanyengi neeringsystems.Tounderstandthekineticchar acterofthelarge scalecoherentvortexstructuresandparticledispersioninplanewakeflowishelpfulforimprovingmanyprocessesinenergyengineering,chemicalengineeringandmaterialengineering .LargeeddysimulationinvolvesbothdirectsimulationandReynolds averagedapproaches.MethodshavebeendevelopedinrecentyearstosolvetheproblemofinstantaneousgasflowfieldandtosimulatehighReynoldsnumb… 相似文献
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目前试点高校均已启动"卓越工程师教育培养计划",部分高校和企业正在积极申报国家级工程实践教育中心。为了鼓励更多行业企业积极主动投入与高校联合培养工程师后备人才的事业中,保证学生企业实习的质和量,建议国家层面制定激励机制,鼓 相似文献
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应用计算流体力学方法对高温下的线板式静电除尘器进行数值模拟，建立综合考虑温度场、电场、流场和颗粒动力场的多场耦合模型。采用有限体积法对计算域进行离散进而求解电场，采用欧拉-拉格朗日方法求解气固两相流动。研究温度对于静电除尘器内颗粒受力的影响。结果表明：随着温度的升高，颗粒所受的静电力减小而Saffman升力、布朗力和曳力均增大；曳力随温度的增加速率比静电力变化快，这可能是导致高温下除尘效率降低的原因。 相似文献
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Gas-solid two-phase turbulent plane jet is applied to many natural situations and in engineering systems. To predict the particle
dispersion in the gas jet is of great importance in industrial applications and in the designing of engineering systems. A
large eddy simulation of the two-phase plane jet was conducted to investigate the particle dispersion patterns. The particles
with Stokes numbers equal to 0.0028, 0.3, 2.5, 28 (corresponding to particle diameter 1 μm, 10μm, 30μm, 100μm, respectively)
inRe=11 300 gas flow were studied. The simulation results of gas phase motion agreed well with previous experimental results.
And the simulation results of the solid particles motion showed that particles with different Stokes number have different
spatial dispersion; and that particles with intermediate Stokes number have the largest dispersion ratio.
Project (No. G19990222) supported by the Special Funds for Major State Basic Research of China 相似文献
10.
依托Ansys Fluent平台及其二次开发程序建立静电除尘器（ESP）内除尘及活性炭汞吸附的数值模型,多场模型耦合了流场、电场、颗粒吸附、颗粒荷电及颗粒运动等子模型,通过该模型对静电除尘器内喷射活性炭汞吸附及颗粒收集的机理和影响因素进行探讨。结果表明活性炭颗粒粒径和ESP内的离子风效应对于除汞除尘效率均有重要影响。活性炭颗粒粒径越小,除汞效率越高,当活性炭粒径为5 μm时,ESP脱汞效率可达89.6%。而离子风的作用对于ESP内两种汞吸附机制有着不同的影响。其中,在ESP内悬浮活性炭颗粒对于汞的吸附机制占主导地位,而近壁面汞吸附效率较低,最大除汞效率不超过10%。将汞吸附子模型的计算结果与实验结果进行对比验证,发现该模型能较好地预测活性炭的脱汞率。 相似文献