This paper is focused on the experimental study of the effects of stator clocking on the performance of a low-speed repeating stage axial compressor with compound-lean stators as well as the one with conventional stat...This paper is focused on the experimental study of the effects of stator clocking on the performance of a low-speed repeating stage axial compressor with compound-lean stators as well as the one with conventional stators （the baseline） for comparison. The experimental results show that as the clocking positions vary, the upstream stator wake enters the following passage at different circumferential positions, and then mixes with the local fluid in the following passage. This is the main reason for the variation of the compressor performance resulted from the stator clocking effects. The variation of the compressor performance due to the clocking effect is less pronounced for the compressor with compound-lean stators than with the baseline. At a certain clocking position, the efficiency of the compressor with compound-lean stators is increased in comparison with that of the baseline, especially on small mass flow rate conditions, e.g., 0.7% at design condition and 3.5% at near-surge condition in this case. The maximum 1.22% and the minimum 0.07% increases in efficiency on design condition are obtained through the combined effects of the stator compound-lean and the stator clocking in this case.展开更多
为研究稀薄燃烧方式对甲醇进气道喷射(methanol port injection,MPI)-汽油缸内直喷(gasoline direct,GDI)双燃料发动机的影响,在缸内直喷光学发动机上加装甲醇进气道喷射装置实现MPI-GDI发动机双燃料复合喷射功能;基于Converge软件建立...为研究稀薄燃烧方式对甲醇进气道喷射(methanol port injection,MPI)-汽油缸内直喷(gasoline direct,GDI)双燃料发动机的影响,在缸内直喷光学发动机上加装甲醇进气道喷射装置实现MPI-GDI发动机双燃料复合喷射功能;基于Converge软件建立仿真模型,利用试验喷雾图像和缸压试验结果验证模型的准确性,研究分层稀燃和均质稀燃对双燃料复合喷射发动机燃烧及排放特性的影响。结果表明:MPI-GDI双燃料发动机的甲醇替代比较低时,相比分层稀燃,均质稀燃缸内峰值压力更大且对应的相位提前,靠近上止点燃烧放热,燃烧定容度更好;随着甲醇替代比增加,分层稀燃情况改善,2种方式燃烧差距减小;相同工况下,均质稀燃时CO和碳烟排放比分层稀燃低,分层稀燃时NO_(x)排放较低;过量空气系数为1.3时,均质稀燃THC排放较低;过量空气系数为1.5时,分层稀燃时THC排放更低。该研究可为降低甲醇-汽油双燃料发动机在不同燃烧方式下的排放提供参考。展开更多
基金National Natural Science Foundation of China (50236020)
文摘This paper is focused on the experimental study of the effects of stator clocking on the performance of a low-speed repeating stage axial compressor with compound-lean stators as well as the one with conventional stators （the baseline） for comparison. The experimental results show that as the clocking positions vary, the upstream stator wake enters the following passage at different circumferential positions, and then mixes with the local fluid in the following passage. This is the main reason for the variation of the compressor performance resulted from the stator clocking effects. The variation of the compressor performance due to the clocking effect is less pronounced for the compressor with compound-lean stators than with the baseline. At a certain clocking position, the efficiency of the compressor with compound-lean stators is increased in comparison with that of the baseline, especially on small mass flow rate conditions, e.g., 0.7% at design condition and 3.5% at near-surge condition in this case. The maximum 1.22% and the minimum 0.07% increases in efficiency on design condition are obtained through the combined effects of the stator compound-lean and the stator clocking in this case.
文摘为研究稀薄燃烧方式对甲醇进气道喷射(methanol port injection,MPI)-汽油缸内直喷(gasoline direct,GDI)双燃料发动机的影响,在缸内直喷光学发动机上加装甲醇进气道喷射装置实现MPI-GDI发动机双燃料复合喷射功能;基于Converge软件建立仿真模型,利用试验喷雾图像和缸压试验结果验证模型的准确性,研究分层稀燃和均质稀燃对双燃料复合喷射发动机燃烧及排放特性的影响。结果表明:MPI-GDI双燃料发动机的甲醇替代比较低时,相比分层稀燃,均质稀燃缸内峰值压力更大且对应的相位提前,靠近上止点燃烧放热,燃烧定容度更好;随着甲醇替代比增加,分层稀燃情况改善,2种方式燃烧差距减小;相同工况下,均质稀燃时CO和碳烟排放比分层稀燃低,分层稀燃时NO_(x)排放较低;过量空气系数为1.3时,均质稀燃THC排放较低;过量空气系数为1.5时,分层稀燃时THC排放更低。该研究可为降低甲醇-汽油双燃料发动机在不同燃烧方式下的排放提供参考。
