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为探究先进旋涡燃烧室凹腔稳焰机制,提出了一种后钝体结构改进方案,并对改进后的燃烧室燃烧特性进行了预混和非预混燃烧数值模拟.结果表明:预混燃烧条件下,当量比为0.6和1.0时,钝体改进结构可有效增强凹腔内旋涡流动强度,增加凹腔内温度,同时使温度分布更加均匀.另外,凹腔内温度随预混进气速度增加而增加,且当速度增大到一定值时,温度变化不明显;非预混燃烧条件下,钝体改进结构可改善凹腔内旋涡流动及温度分布,在贫油燃烧状态时,凹腔内仍可维持较高的温度;钝体改进使燃烧室质量更小,具有一定的工程参考意义.
In order to explore the steady flame mechanism of the cavity of the advanced vortex combustor, an improved bluff body structure was proposed and the combustion characteristics of the improved combustor were numerically simulated by premixed and non-premixed combustion. The results show that the premixed combustion conditions , When the equivalent ratio is 0.6 and 1.0, the improved structure of bluff body can effectively enhance the vortex flow intensity in the cavity, increase the temperature in the cavity and at the same time make the temperature distribution more uniform.In addition, the temperature in the cavity increases with the premixed intake speed And the temperature does not change obviously when the velocity increases to a certain value. Under the condition of non-premixed combustion, the improved structure of the bluff body can improve the vortex flow and temperature distribution in the cavity, and in the lean combustion state, Can still maintain a higher temperature; blunt body to improve the quality of the combustion chamber smaller, with some engineering reference.