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柴油機(jī)壁流式過(guò)濾體捕集與流阻性能影響規(guī)律
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Filtration and Flow-resistance of Wall-flow Diesel Particulate Filter
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    摘要:

    根據(jù)氣流在柴油機(jī)壁流式微粒捕集器內(nèi)的流動(dòng)特點(diǎn),，將過(guò)濾壁面假設(shè)為由若干球狀單元組成,，建立了壁流式過(guò)濾體捕集過(guò)程的數(shù)學(xué)模型,。研究了排氣特征、過(guò)濾體結(jié)構(gòu)參數(shù)對(duì)壁流式過(guò)濾體捕集及流阻性能的影響規(guī)律,。結(jié)果表明，減小排氣流量,、增大過(guò)濾體體積等方法,，既能優(yōu)化捕集性能,，又能優(yōu)化流阻性能；減小過(guò)濾體長(zhǎng)徑比,，能優(yōu)化流阻性能,，而對(duì)捕集性能沒(méi)有影響；增大過(guò)濾壁厚度,，能優(yōu)化捕集性能,，但會(huì)使流動(dòng)性能惡化；改變排氣溫度和孔道寬度,，對(duì)捕集性能及流阻性能的影響都較小,。最后通過(guò)試驗(yàn)驗(yàn)證了數(shù)學(xué)模型的準(zhǔn)確性。

    Abstract:

    Based on the air-flow characteristics of diesel wall-flow particulate filter, the mathematical model of loading process for the wall-flow filter was proposed. In this model, the porous wall was assumed to be composed of numerous spherical collectors. The effects of the exhaust-flow characteristic and the structural parameter of filter on the over-all properties of filter were analyzed. The results showed that decreasing exhaust-flow and increasing volume of filter optimize the characteristics of filtration and flow-resistance. Decrease in the ratio of length to diameter of filter optimize flow-resistance, whereas has no influence on filtration. Increment in wall thickness optimizes filtration, whereas deteriorates flow-resistance. Exhaust temperature and channel width both have a minor influence on both filtration and flow-resistance. The experimental results verified the accuracy of mathematical model. 

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龔金科,劉云卿,龍罡,吳鋼,余明果,吁璇.柴油機(jī)壁流式過(guò)濾體捕集與流阻性能影響規(guī)律[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2009,40(12):1-7. Filtration and Flow-resistance of Wall-flow Diesel Particulate Filter[J]. Transactions of the Chinese Society for Agricultural Machinery,2009,40(12):1-7.

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