为改善进气道出口流场畸变对燃烧室性能的不良影响，开展了气动格栅设计。采用数值模拟方法，对扩压器、带气动格栅扩压器、扩压器-燃烧室和带气动格栅扩压器-燃烧室的三维流场进行了数值模拟。结果表明，进气道出口流场畸变，使扩压器出口流场均匀性变差，存在大面积的低速区和分离区；燃烧发生在火焰稳定器上游，燃烧室边区也出现大面积燃烧，导致组件容易被烧毁和组织燃烧性能变差；气动格栅能有效改善扩压器出口流场的均匀性，改善燃烧室性能。%In order to alleviate the negative effect of the air intake outflow distortion on ramjet combustor performance, aerodynamic grids were designed. The flow field of diffuser and diffuser-combustor with/with-out aerodynamic gird was simulated with a 3D numerical study. The results show that, for the distortion of intake outflow, the uniformity of diffuser flow field deteriorates, and a large proportion of low speed area and separation zone appear; the combustion appears at the upstream of the flame-holders and the boundary zones of combustor, which will cause the burning of the flame-holders and fuel injection poles and the com-bustion-arrange performance deteriorates;the aerodynamic grid can improve the uniform profile of the dif-fuser outflow, so the combustor performance become better.
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