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。
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, and it can expand the scope of intense turbulent fluctuation region. Moderate swirl can help to maintain dual vortex. For reacting flow, the effect of swirl on the overall strength of the recirculation zone is stronger than that fornon-reacting flow. However, dual swirl suppresses cavity turbulent fluctuation. Combustion can change cavity recirculation and swirl recirculation form apparently, it strengthens the 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 stronger axial attenuation characteristics for the gas than forturbulent fluctuation.
作者
曾卓雄
张永祺
张龙
ZENG Zhuoxiong;ZHANG Yongqi;ZHANG Long(College of Power and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090*China;School of Aircraft Engineering,Nanchang Hangkong University,Nanchang 330063,China)
出处
《热科学与技术》
CAS
CSCD
北大核心
2020年第2期139-145,共7页
Journal of Thermal Science and Technology
基金
国家重点研发计划资助项目(2018YFB0604204)
上海市科委地方高校能力建设资助项目(9020500900)。
关键词
旋流
驻涡燃烧室
燃烧室性能
swirl
trapped vortex combustor
combustor performance
作者简介
曾卓雄,男,1972年生,博士,教授,主要研究领域为动力工程.E-mail:zerigzhx@163.com。
