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Numerical Simulation on New Conical Spray for Diesel Premixed Charge Compression Ignition
( Li Yan Feng ),( Wu Qiang Long ),( Bao Guo Du ),( Xian Yin Leng ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
Concerning the difficulty of pre-mixture preparation for diesel HCCI combustion, a new conical spray is proposed. The new conical spray is formed by the combination of multi-hole nozzle and close impingement structure. The new spray has characteristics of high dispersion and acts with flexible penetration in design. Three-dimensional CFD package AVL FIRE 8.2 was used to simulate pre-mixture preparation process with the new conical spray. The effects of combustion chamber shape and impingement structure on pre-mixture quality were analyzed. The calculation results indicate the following conclusions: (1) with the application of new conical spray, fuel impingement and adhesion on piston or liner surface are avoided; (2) combustion chamber shape has crucial effect on pre-mixture homogeneity, which is apparent when start of injection is or later than 60°CA BTDC; (3) compared with other kinds of combustion chamber, deep reentrant combustion chamber performs better on pre-mixture preparation if the start of injection is 60° or 80°CA BTDC; (4) the geometry of impingement orientation structure also affects pre-mixture quality.
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