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柴油機(jī)壁流式過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)的流動特點，將過濾壁面假設(shè)為由若干球狀單元組成，建立了壁流式過濾體捕集過程的數(shù)學(xué)模型。研究了排氣特征、過濾體結(jié)構(gòu)參數(shù)對壁流式過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；減小過濾體長徑比，能優(yōu)化流阻性能，而對捕集性能沒有影響；增大過濾壁厚度，能優(yōu)化捕集性能，但會使流動性能惡化；改變排氣溫度和孔道寬度，對捕集性能及流阻性能的影響都較小。最后通過試驗驗證了數(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,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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