高温升三旋流燃烧室与双旋流燃烧室的性能对比

采用参数化建模的方法,保持扩压器尺寸、外机匣最大直径以及燃烧室出口尺寸与单环腔燃烧室(SAC)一致,将燃烧室头部旋流器从双旋流结构设计为三旋流结构,采用三维数值模拟的方法对双旋流燃烧室(DSC)和三旋流燃烧室(TSC)的流动和燃烧过程进行数值模拟.对比研究了两种燃烧室在高温升条件下的性能.结果表明:传统的DSC已不能满足油气比为0.037的高温升燃烧室的燃烧效率等性能需求,TSC可获得比DSC更高的总压恢复系数、燃烧效率以及温升,更低的出口温度分布系数(OTDF)和径向出口温度分布系数(RTDF);在油气比为0.037情况下,设计的高温升TSC总压降在5%以内;OTDF为0.162,RTDF为0.106;燃烧效率大于99%. 

Performance comparison between high temperature rise triple-swirler combustor and double-swirler combustor

With use of the parametric modeling method, when the size of diffuser, the maximum dimension of outer case and exit size of combustor were kept the same as single annular combustor (SAC), the combustor head swirler was redesigned from the double-swirler structure into triple-swirler structure; the three-dimensional flow and combustion processes of double-swirler combustor (TSC) and triple-swirler combustor (TSC) were numerically simulated, and the performance of two high temperature rise combustors were compared. The results indicate that, the traditional DSC cannot meet performance requirement such as combustion efficiency of high temperature rise combustion with fuel air ratio of 0.037; by using the TSC, the total pressure recovery coefficient, combustion efficiency and temperature rise can be improved compared with the DSC; the outlet temperature distribution factor (OTDF) and radial outlet temperature distribution factor (RTDF) of TSC is lower than that of DSC. With fuel air ratio of 0.037, the total pressure drop of designed high temperature rise TSC is less than 5%, OTDF reaching 0.162, RTDF reaching 0.106, and combustion efficiency is more than 99%.