反射激波后状态分析及对燃料反应进程的影响  

States Analysis Behind Reflected Shock Waves and Effects on Fuel Reaction Processes

作　　者：何东 丁艳军[1] 彭志敏[1] He Dong;Ding Yanjun;Peng Zhimin(State Key Laboratory of Power System and Generation Equipment,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学能源与动力工程系电力系统及发电设备控制和仿真国家重点实验室,北京100084

出　　处：《燃烧科学与技术》2022年第2期111-118,共8页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(11972213).

摘　　要：反射激波后的压力随时间推移往往呈现不稳定状态.该现象会对燃料的反应进程产生影响,是造成激波管测量数据和模拟结果存在偏差的主要原因之一.针对上述问题,基于激波管流动理论,计算了非反应气体反射激波后的压力演变过程,计算结果和压力测量结果吻合较好.为了分析中、高压条件下压力渐升过程对燃料反应进程的影响,利用激光吸收光谱技术测量了正庚烷氧化过程中温度和CO摩尔分数的演变过程;测量结果快于基于定容、定热力学能假设和定压、定焓假设的机理预测结果,说明压力渐升过程明显促进燃料反应;采用测量压力作为输入信号进行模拟,模拟过程更接近实际,可减少实验和模拟之间偏差造成的影响.The pressures behind reflected shock waves are usually in unstable states.With its effect on fuel reac-tion processes,this phenomenon has become a main factor causing gaps between the measured data inside the shock tube and the simulated data.This study calculated the pressure time-history behind reflected shock waves based on the shock-wave theory.The calculated results fitted well with the measured ones.Laser absorption spectroscopy was used to measure temperature and CO-concentration time-history during n-heptane oxidation to demonstrate the influences of unstable states on fuel reaction processes.The measured results were illustrated to be faster than the predictions based on the constant-volume,constant-internal-energy assumption and the constantpressure,constant-enthalpy assumption.The results demonstrate that the pressure gradual rising processes can significantly promote fuel oxidation.Using measured pressure profiles as inputs during kinetics simulation helps diminish the influences caused by the gaps between experiments and simulation.

关 键 词：激波管 激光吸收光谱 非理想效应 边界层 

分 类 号：TK31[动力工程及工程热物理—热能工程]