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          華中科技大學學報(自然科學版) 2020, Vol. 48 Issue (12): 61-65 DOI10.13245/j.hust.201211

          欄目:機械工程
          柴油機排氣管內碳煙顆粒的形貌計算
          鞠洪玲 , 卞釩全 , 魏明銳
          武漢理工大學 1.現代汽車零部件技術湖北省重點實驗室;汽車零部件技術湖北省協同創新中心,湖北 武漢 430070
          摘要 以排氣管內碳煙顆粒為模擬對象,基于流體-軌道模型,采用拉格朗日方法追蹤每個顆粒的運動軌跡,考慮顆粒之間的碰撞、凝并等動力學過程,構建了顆粒動力學演變過程的模型.在柴油機轉速為1 800 r/min條件下,計算不同平均有效制動壓力(0.38,0.63,0.88,1.13 MPa)下排氣管內碳煙顆粒的動力學演變過程,獲得碳煙顆粒的形貌并統計出分形維數.結果表明:構建的模型可以很好地計算顆粒碰撞后的形貌和分形維數,顆粒最終形貌呈現出枝狀和簇狀,分形維數與實驗結果相符合;隨著負荷的增加,分形維數增加.此外,構建的模型可以很好地觀察到顆粒的生長過程,有助于更深入地研究碳煙形成.
          關鍵詞 柴油機排氣管 ;碳煙顆粒 ;動力學演變 ;形貌 ;分形維數
          Morphology calculation of soot particles in diesel exhaust pipe
          JU Hongling , BIAN Fanquan , WEI Mingrui
          1.Hubei Key Laboratory of Advanced Technology for Automotive Components;2.Hubei Collaborative Innovation Center for Automotive Components Technology,Wuhan University of Technology,Wuhan 430070,China
          Abstract With the soot particles in diesel exhaust pipe was took as simulation object,based on the fluid-orbit model,the Lagrangian method was used to track the trajectory of each particle,and the dynamic events such as collision and agglomeration between particles were considered to construct the particle dynamic evolution process model.At the engine speed was 1 800 r/min,the dynamic evolution processes of soot particles with different BMEPs (brake mean effective pressure) (0.38,0.63,0.88,1.13 MPa) were simulated to obtain the morphology and fractal dimension of soot particles in diesel exhaust pipe.It can be seen that the constructed model can well calculate the morphology and fractal dimension of particles after collision.The final morphology of soot particles is dendritic and cluster,and the fractal dimension is consistent with the experimental results.With the increase of BMEPs,the fractal dimension increases.In addition,the constructed model can well observe the growth process of particles,which is helpful for more in-depth study of soot formation.
          Keywords diesel exhaust pipe ; soot particles ; dynamic evolution ; morphology ; fractal dimension
          基金資助國家自然科學基金青年基金資助項目(51706163).

          中圖分類號TK411
          文獻標志碼A
          文章編號1671-4512(2020)12-0061-05
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          文獻來源
          鞠洪玲, 卞釩全, 魏明銳. 柴油機排氣管內碳煙顆粒的形貌計算[J]. 華中科技大學學報(自然科學版), 2020, 48(12): 61-65
          DOI:10.13245/j.hust.201211
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