柴油机排气微粒凝并及旋流分离的基础理论与实验研究

According to the characteristics of the diesel engine exhaust and particulates, the mechanisms of agglomeration and inertial cyclone separation have been studied in this research work by using the method of the combination of theoretical analysis with experimental study. The possibility of promoting the diesel particulate agglomeration by using Brown coagulation, static coagulation, polarization coagulation and cyclone effect, and the possibility of achieving suitable cyclone field for the particulate separation by using the method of introducing second wind into the cyclone separator and extracting exhaust from the cyclone separator in this way to promote diesel particulate separation, have been studied. The main work and research results include: (1) Analyzing the characteristics of the diesel particulate from the point of particulate inertial separation for the first time, and presenting a method for the evaluation of the irregular degree of the diesel particulate. (2) Establishing the cooling agglomeration model and pulse corona discharge agglomeration model of the diesel particulate for the first time, designing and making the perfect experimental system of water-cooled agglomeration and pulse corona discharge agglomeration of exhaust particulate, and studying the main factors affecting the diesel particulate agglomeration on the basis of the established mathematical mode and experimental system. (3) Establishing the calculation mode of the pulse flow cyclone field and particulate separation for the first time, designing and making the perfect diesel particulate separation experimental system with the second wind introducing device and extracting exhaust device, and studying the characteristics of diesel particulate cyclone separation on the basis of the established mathematical mode and experimental system. The research results can provide the theoretical and experimental basis for the studying of the practical technology of diesel particulate cyclone separation.

采用理论分析与实验研究相结合的方法，根据柴油机排气及微粒的特点，研究高速脉动的柴油机排气微粒的凝并及旋流分离机理；探求利用布朗凝并、静电凝并、极化凝并及旋流作用促使微粒凝并，并利用二次风和排气引流方法以获得适合于微粒分离的旋源流场，促进柴油机排气微粒的分离捕集；为柴油机排气微粒旋流分离实用技术的研究提供理论和实验依据。