高静温预混超声速气流斜激波诱导脱体爆震波不稳定机理研究

With the background of detonation potential application in the hypersonic propulsion system, the structure, initiation and propagation of oblique detonation wave (ODW) will be investigated based on the continuous high temperature premixed supersonic air heater and the results of unattached ODW experiment. First windows will be designed at the surface of premixed nozzle to study the process of fuel jetting and mixing with acetone PLIF. Then high speed schlieren system and OH PLIF will be adopted to analyze the structure and form mechanism of ODW and unattached ODW. Additionally the transition process of unattached ODW to CJ ODW will be also discussed. At last the influence of parameters such as the coming flow state, the hot jet strength and wedge angle on the ODW initiation will be researched. The ODW initiation mechanism and frequency will be summarized. Moreover the propagation characteristic of unattached ODW in supersonic flow will also be studied.. This research will be helpful to understand the shock inducing detonation initiation, the detonation development and the structure, initiation and propagation of ODW..

以爆震燃烧在未来高超声速推进系统中潜在的应用为背景，在已成功研制的连续式高静温预混超声速加热器以及脱体斜爆震的实验基础上，开展斜爆震结构、起爆及传播特性的深入研究。首先结合在阵列喷管处开窗和丙酮PLIF等手段，对二次流的喷注和混合过程进行研究，明确超声速预混气的来流状态；接着采用高速纹影及OH基PLIF技术，对斜爆震和脱体爆震波的形成机理和结构进行分析，并研究脱体斜爆震向CJ斜爆震的转变过程；最后通过改变来流状态、热射流强度、斜劈角度等手段，对比研究多种参数对斜爆震起爆过程的影响，总结斜爆震波的起爆机理和起爆频率，并对脱体爆震波在超声速气流中的传播特性进行研究。. 该项研究将加深认识激波诱导直接起爆与爆震发展的物理过程，有助于更全面地理解斜爆震的结构、起爆和传播特性。..    .

系统开展了超声速气流中斜劈、斜坡斜爆震起爆机理研究，获得了突跃、平滑两种斜爆震构型，认为波后产生亚声速区是形成突跃型斜爆震的主要因素；总结了当量比、来流温度、马赫数、斜劈角度等因素对起爆的影响规律，提出了带折角斜劈的斜爆震起爆及驻定方案；初步总结了边界层对斜爆震形态的影响规律。开展了超声速气流中斜爆震波驻定特性研究，揭示了斜爆震波前传诱因并建立了理论分析模型。分析了超声速气流中悬臂斜坡的燃料喷注与混合特性，数值验证了斜爆震波对非均匀来流的自适应能力。