强旋流适应性一体化消旋波瓣混合器射流掺混机理研究

Lobe mixer has been widely applied in turbofan engine with medium/small bypass ratio, for its significant effect on increased thrust, noise reduction and suppression of infrared radiation. The project focused on the jet mixing mechanism of lobe mixer integrating with outlet guide vanes of the highly-loaded low pressure turbine. The experiments will be carried out on the co-axial, low-speed wind tunnel which can change the inlet swirl with different radial distribution by assembling different guide vanes rings. The seven-hole probe, three-dimensional hotwire and surface mounted hot-film will be used to measure the detail flow field downstream of lobed mixer. The optimal collocation scheme for lobe mixer and the integrated outlet guide vanes will be explored, its effect on development and interaction of vortex downstream of the lobe mixer will be revealed. Finally, it will assess the jet mixing performance under different inlet swirl conditions. On this basis, the design guidelines of the lobed mixer integrating with outlet guide vanes will be concluded.

波瓣混合器在中小涵道比涡扇发动机中有着广泛的应用，其对于增加推力、降低噪音和抑制红外辐射具有十分显著的效果。本申请项目拟以消旋波瓣混合器与高负荷低压涡轮出口导叶一体化配置规律及其对射流掺混的影响机理为主题，以能产生不同径向布局的进口预旋的低速同心双环流风洞实验台为实验载体，借助七孔探针、PIV及表面油流显示等实验测量技术，探索波瓣与集成出口导叶的优化配置规律，揭示消旋波瓣与出口导叶一体化设计对下游流向涡和正交涡发展及其相互作用过程的影响，评估一体化消旋波瓣混合器的的射流掺混特性，为排气系统减重及其与高负荷LPT叶片的良好匹配提供基础性的技术支撑。

波瓣混合器在中小涵道比涡扇发动机中有着广泛的应用，其对于增加推力、降低噪音和抑制红外辐射具有十分显著的效果。本申请项目以消旋波瓣混合器与高负荷低压涡轮出口导叶一体化配置规律及其对射流掺混的影响机理为主题，以能产生不同径向布局的进口预旋的低速同心双环流风洞实验台为实验载体，探索了波瓣与集成出口导叶的优化配置规律，揭示了消旋波瓣与出口导叶一体化设计对下游流向涡和正交涡发展及其相互作用过程的影响机理，并详细评估了一体化消旋波瓣混合器的的射流掺混特性。通过研究，突破了新型消旋波瓣混合器设计、及其与中心锥及涡轮后支板一体化优化集成等方面关键技术，为排气系统减重及其与高负荷LPT叶片的良好匹配提供了基础性的技术支撑。经试验验证，新型旋流适应性紧凑波瓣混合器的应用使得排气系统掺混效率提高5.2%，掺混管缩短21%，抗预旋能力提高到20°，排气系统减重15.5%，实现了显著提升发动机排气系统性能和降低排气系统重量的双重目标。在该项目资助下，累计（待）发表论文12篇，其中已发表SCI检索论文5篇，申请专利7项，获省部级奖励1项，培养研究生3名。