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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part D. Journal of Automobile Engineering >Modelling gas flow pressure gradients in gelcast ceramic foam diesel particulate filters
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Modelling gas flow pressure gradients in gelcast ceramic foam diesel particulate filters

机译：在凝胶铸造的陶瓷泡沫柴油颗粒过滤器中模拟气流压力梯度

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摘要

New mathematical models are proposed that predict fluid flow pressure gradients in gelcast ceramic foam diesel exhaust particulate filters by considering the foam structure conceptually as serially connected orifices. The resulting multiple orifice mathematical (MOM) model is based on the sum of a viscous term derived from an extended Ergun model and the kinetic energy loss derived from the Bernoulli and conservation of mass equations. The MOM model was calibrated using experimental data obtained from measuring the air flowrate and pressure drop across a physical large-scale three-dimensional model of a cellular foam structure produced using rapid manufacturing techniques. The calibrated model was then validated using fluid flow data obtained from gelcast ceramic foam filters of various cell sizes and was found to require no empirical recalibration for each gelcast ceramic foam sample. The MOM model for clean filters was extended to predict pressure gradients of filters loaded with particulate matter (PM), The prediction of pressure gradients through gelcast ceramic filters using the MOM model for clean and PM-loaded cases was shown to be in reasonable agreement with experimental data. The models were finally applied to design a filter for a turbocharged, charge-cooled, 2.01, four-stroke, common rail, direct injection passenger car diesel engine.
机译：提出了新的数学模型，该模型通过将泡沫结构概念上视为连续连接的孔口，来预测凝胶铸造陶瓷泡沫柴油机排气颗粒过滤器中的流体压力梯度。所得的多孔数学（MOM）模型基于从扩展的Ergun模型导出的粘性项与从Bernoulli导出的动能损失和质量方程守恒的总和。使用通过测量使用快速制造技术生产的多孔泡沫结构的物理大规模三维模型的空气流速和压降获得的实验数据对MOM模型进行校准。然后使用从各种泡孔大小的凝胶浇铸陶瓷泡沫过滤器获得的流体流量数据验证校准后的模型，发现不需要对每个凝胶浇铸陶瓷泡沫样品进行经验性的重新校准。扩展了用于清洁过滤器的MOM模型，以预测装有颗粒物（PM）的过滤器的压力梯度。事实证明，使用MOM模型对清洁和PM加载情况下的凝胶铸造陶瓷过滤器进行压力梯度预测与实验数据。该模型最终应用于为涡轮增压，增压冷却，2.01，四冲程，共轨，直喷客车柴油发动机设计的过滤器。

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