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合理的混合器结构对组合动力系统的高效燃烧和推进性能具有重要意义。为了获得最佳掺混效果,缩短燃烧室长度,利用CFD程序分别对环形、旋流器型和波瓣混合器中内、外涵燃气/空气的流动和掺混特性进行了全三维数值模拟。燃气为甲烷液氧富燃燃气。结果表明:无论采用何种混合器,随着掺混距离的增加,总温和组分均趋均匀;其中,波瓣混合器的掺混效果最好,内外双旋流型混合器的掺混效果次之,环形混合器的掺混效果较差;环形混合器内涵燃气喷射角度对燃气/空气掺混效果具有一定的影响,燃气与轴向成15°喷射时,掺混效果优于无角度喷射。
A reasonable mixer structure is of great importance to the efficient combustion and propulsion performance of a combined power system. In order to obtain the best mixing effect and shorten the length of the combustion chamber, a full three-dimensional numerical simulation of the flow and blending characteristics of the gas / air inside and outside the toroidal, cyclone and lobed mixers was carried out by CFD program. Gas for the methane liquid oxygen rich combustion gas. The results show that no matter what type of mixer is used, the total temperature and the components tend to be uniform with the increase of the mixing distance. Among them, the mixing efficiency of the lobe mixer is the best, Secondly, the mixing efficiency of the ring mixer is poor. The gas injection angle of the annular mixer has some influence on the gas / air blending effect. When the gas is injected with the axial direction at 15 °, the blending effect is better than the non-angle injection .