沿驻点线化学非平衡程度评估方法  

Evaluation Method of Chemical Non-equilibrium along Stagnation Line

作　　者：杨天鹏 严东升[1] 于江鹏 郭阳 刘文伶[1] Yang Tian-peng;Yan Dong-sheng;Yu Jiang-peng;Guo Yang;Liu Wen-ling(Beijing Institute of Space Long March Vehicle,Beijing,100076)

机构地区：[1]北京航天长征飞行器研究所,北京100076

出　　处：《导弹与航天运载技术（中英文）》2023年第1期122-126,共5页Missiles and Space Vehicles

摘　　要：为了研究高温真实气体效应中的化学非平衡的程度,针对球头的沿驻点线流动,通过高温高压气体的化学反应历程估算化学反应特征时间,使用正激波流动关系来估算流动特征时间,建立了化学非平衡评估模型,给出了化学非平衡程度随马赫数和高度的变化关系。计算结果表明,马赫数越大、高度越低,化学反应特征时间比流动特征时间越小,定义的化学反应特征时间与流动特征时间量级相当时为化学非平衡流动,时间比大于10则接近化学冻结流,时间比小于0.1则接近化学平衡流。在设定的球头模型下,化学反应平衡流在高度0km、10km、20km、30km、40km分别需要马赫数大于8.0、9.5、10.8、12.7、20.0,化学反应冻结流在高度30km、40km、50km、60km分别需要马赫数小于8.4、10.2、12.9、17.5,中间来流状态对应化学反应非平衡状态。In order to study the degree of chemical non-equilibrium in high-temperature real gas effect,this paper begins with the flow of the ball head along the stagnation line to establish a chemical non-equilibrium evaluation model.In this model,the chemical reaction characteristic time is calculated by using the chemical reaction process,and the flow characteristic time is evaluated by using the relationship before and after the normal shock wave.The degree of chemical non-equilibrium variation law with Mach number and height is given.Calculation results show that the larger the Mach number and the lower the height makes the ratio of chemical reaction characteristic time and flow characteristic time smaller.The flow is chemical non-equilibrium when the chemical reaction characteristic time and flow characteristic time is in the near order of magnitude.If the time ratio is greater than 10,the flow is close to the chemical equilibrium flow,and if the time ratio is less than 0.1,the flow is close to the chemical frozen flow.Under this ball head model,the chemical equilibrium flow requires Mach numbers greater than 8.0,9.5,10.8,12.7,and 20.0 at heights of 0 km,10 km,20 km,30 km,and 40 km respectively.The chemical frozen flow requires Mach numbers less than 8.4,10.2,12.9,and 17.5 at heights of 30 km,40km,50 km,and 60 km respectively.The intermediate inflow state is chemical non-equilibrium flow.

关 键 词：数值模拟 高温真实气体效应 化学非平衡 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]