旋流对驻涡燃烧室湍流流动的影响

The Effect of Swirl on Turbulence Flow in Trapped-Vortex Combustor

中文关键词: 旋流  驻涡燃烧室  燃烧室性能

英文关键词: swirl  trapped vortex combustor  combustor performance

中文摘要:

      为分析旋流对湍流流动的影响,对并排双旋流模式以及无旋流模式下的流场进行了数值模拟。在冷态下,旋流间的相互作用主要影响回流区形态,旋流极大拓展了湍流大脉动区域,适中的旋流更利于维持双涡结构。在热态下,旋流对对回流区总体强度的影响比冷态更强烈,双旋流使凹腔湍流脉动受到抑制。燃烧能显著改变凹腔回流区和旋流回流区形态,增强旋流回流区强度,缩小其尺度,但使凹腔回流区尺度和强度均明显减小。燃烧可改善双涡结构,使气流旋动比湍流脉动具有更强的轴向衰减特性。

英文摘要:

      In order to analyze the influence of swirl on turbulent flow, numerical simulation on traped-vortex combustor with dual swirlers and without swirler was performed. For non-reacting flow, swirl mainly affects recirculation zone structure, it can expand scope of intense turbulent fluctuation region, moderate swirl is better to maintain dual vortex. For reacting flow, the effect on the overall strength of the recirculation zone is stronger than that in the cold flow. However, dual swirl suppresses cavity turbulent fluctuation. Combustion can change cavity recirculation and swirl recirculation form apparently, it strengthens swirl recirculation intensity and reduces its scale, but combustion reduces both cavity recirculation scale and cavity intensity obviously. Combustion can improve dual vortices structure, and make gas axial attenuation characteristics stronger than turbulent fluctuation.