CAJ | 학술논문

为探索带交错尾部支板的超燃燃烧室流场特性,运用有限体积法对乙烯喷注当量比0.6的燃烧室进行了数值模拟. 对比喷孔不同布置方式,支板尾部交错结构不同数目、不同翘角对混合效率、总压损失的影响. 研究发现,喷孔数目越多,对燃料与空气充分混合越有利,但过多喷孔会降低穿透深度,且导致可燃混合区重叠,不利于掺混增强;交错结构数目越多,产生的流向涡涡量强度越大,但远场混合效率并不理想,当支板交错结构数目等于4时,在凹腔附近能取得较大掺混效率;在一定范围内,支板翘角越大,掺混效果越好,交错结构掠形尾部也有利于掺混增强,但均会导致更大的总压损失.
위탐색대교착미부지판적초연연소실류장특성,운용유한체적법대을희분주당량비0.6적연소실진행료수치모의. 대비분공불동포치방식,지판미부교착결구불동수목、불동교각대혼합효솔、총압손실적영향. 연구발현,분공수목월다,대연료여공기충분혼합월유리,단과다분공회강저천투심도,차도치가연혼합구중첩,불리우참혼증강;교착결구수목월다,산생적류향와와량강도월대,단원장혼합효솔병불이상,당지판교착결구수목등우4시,재요강부근능취득교대참혼효솔;재일정범위내,지판교각월대,참혼효과월호,교착결구략형미부야유리우참혼증강,단균회도치경대적총압손실.
The numerical simulation based on the finite volume method of combustor with an ethylene equivalence ratio of 0.6 was carried out to investigate the flow field characteristics of supersonic combustor patterns with alternating-wedge strut. The impacts of different arrangements for injectors, different numbers of alternating-wedge structures of strut and different upswept angles on mix-ing efficiency and total pressure loss were considered. The result shows that more injectors will lead to better mixing effect of air with fuel, whereas too many injectors will reduce the penetration depth and lead to the lapping of fuel plume area which goes against the mixing efficiency. More alternating-wedge structures lead to stronger stream wise vortices, but the mixing efficiency of farther region is not ideal and high mixing efficiency can be obtained near the cavity by four rears. To some degree, the bigger the upswept angle is, the higher the mixing efficiency will be and tapered rear strut is also in favor of enhancing the mixing effect, however both of them will result in more total pressure loss.