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针对单元贫油直喷(LDI)喷嘴的旋流器设计问题,实验研究了旋流器结构变化(改变旋流器级数、双旋流器旋向及混合段收缩角等)对燃烧室总压损失、燃烧效率以及污染物排放等性能的影响规律.结果表明:旋流器结构变化对燃烧室性能有很大影响.同向双旋流燃烧室总压损失大于与之相同计算旋流数的单级旋流燃烧室,反向双旋流燃烧室总压损失略低于同向双旋流燃烧室,燃烧室总压损失随收缩角增大而呈增大趋势.相较单级旋流燃烧室和同向双旋流燃烧室,反向双旋流燃烧室在不同贫油气比工况下均具有更高的燃烧效率和更低的污染物排放.另外,燃烧效率及污染物排放受收缩角的影响.最佳收缩角角度的选取需要综合权衡总压损失、燃烧效率及污染物排放水平.
Aiming at the design of swirler of unit lean direct injection (LDI) nozzle, the influences of the structure of swirler (changing the number of swirler, the swirling direction of double swirler and the mixing angle of mixing section) Pressure loss, combustion efficiency and pollutant discharge.The results show that: the cyclone structural changes have a great impact on the performance of the combustion chamber.The total pressure loss in the same direction double-swirl combustion chamber is greater than the same calculation of the number of swirl , The total pressure loss in the reverse double-swirl combustion chamber is slightly lower than that in the same-direction double swirl combustion chamber, and the total pressure loss in the combustion chamber tends to increase with the increase of the shrinkage angle. Flow combustor and co-rotating double-swirl combustor, double swirl combustor have higher combustion efficiency and lower pollutant emission under different lean-to-lean operating conditions.In addition, combustion efficiency and pollutant emissions Affected by the angle of contraction The selection of the optimum angle of contraction requires a comprehensive trade-off of total pressure loss, combustion efficiency and pollutant discharge levels.