氢气/氧气/稀释气混合气高温高压下层流燃烧速度的测量  

Measurements on laminar burning velocities of hydrogen/oxygen/diluents at elevated pressure and temperature

作　　者：吕鑫[1] 胡二江[1] 彭成[1] 孟鑫[1] 黄佐华[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《航空动力学报》2017年第7期1599-1604,共6页Journal of Aerospace Power

基　　金：国家自然科学基金(91441118)

摘　　要：利用定容燃烧弹和高速纹影摄像系统,研究了高温高压条件下,不同稀释气和稀释系数对氢气/氧气/稀释气混合气层流燃烧速度的影响,获得了当量比为0.6~4.0,初始压力为0.1~0.5MPa,稀释系数为4~8的氢气/氧气/稀释气混合气的层流燃烧速度,并对其进行了数值模拟。实验和模拟均发现,在当量比小于1.0和大于3.0的范围内,层流燃烧速度均随初始压力升高而降低。而在当量比为1.0~3.0范围内,层流燃烧速度随初始压力升高呈现非单调变化的规律。通过敏感性分析发现三体反应(R15)在氮气作为稀释气的时候是抑制反应,而在氩气和氦气作为稀释气时是促进反应,主要是由于各稀释气热物性不同引起的。在当量比为1.0~3.0范围内,层流燃烧速度随初始压力升高呈现的非单调变化主要是链分支反应R1和链终止反应R15相互竞争的结果。The effects of different diluents and dilution ratios on laminar burning veloci ties of hydrogen/oxygen/diluents mixtures were studied at elevated pressures and temperatures with a constant volume combustion chamber and a high-speed schlieren system. Both experimenfal and numerical laminar burning velocities of hydrogen/oxygen/diluents mixture were obtained at equivalence ratios of 0. 6-4.0, initial pressures of 0.1-0.5 MPa, and dilution ratios of 4-8. The results showed that the laminar burning velocity varied non-mono- tonically with the increase of the initial pressures and equivalence ratios among 1.0--3.0, and the laminar burning velocity deceased with the increase of initial pressure when the e- quivalence ratio was less than 1.0 or more than 3.0. Through sensitivity analysis of elemen- tal reaction, three-body reaction （R15） was found to restrain reaction in nitrogen diluted mixture, and promote reaction in both argon and helium diluted mixtures, mainly due to dif-ferent thermal physics properties of different diluents. When the equivalence ratios were within the ranges of 1.0-3.0 the non-monotonic change of laminar burning velocities with the increase of initial pressures was mainly due to the coml）etition between chain-branching reaction R1 and chain-terminating reaction R15.

关 键 词：氢气 稀释气 层流燃烧速度 非单调变化 敏感性分析 

分 类 号：V231.21[航空宇航科学与技术—航空宇航推进理论与工程]