气体取样分析在脉冲燃烧风洞试验中的应用

发布时间：2019-06-24 19:15

【摘要】：针对脉冲燃烧风洞试验条件及超燃冲压发动机燃烧室出口流场环境,设计了用于脉冲燃烧风洞流场氧气组分浓度校核及发动机燃烧室出口气流组分分析的探针取样-气相色谱分析测量系统,并在此基础上完成了对取样探针内部流场特性及燃气化学反应冻结情况分析。分析结果表明,进入探针的气流被有效冷却,能够实现化学反应冻结。利用风洞试验气流进行了系统校核,系统控制方面能够满足脉冲风洞试验测量要求,所得到的气流中氧气含量测量值与理论值吻合较好,偏差小于5%,甚至低至0.4%。利用该系统对马赫数2.6来流条件、直连式燃烧室模型燃烧工况下,出口不同位置处燃气中O2、N2和CO2等主要气体组分进行了直接测量,并进而估算了各测点处的表观燃烧效率,获得了其变化情况,所得到的结果在一定程度上反映了燃烧室中燃料的分布情况。
[Abstract]:According to the test conditions of pulse combustion wind tunnel and the flow field environment at the outlet of scramjet combustion chamber, a probe sampling-gas chromatography analysis and measurement system for checking the concentration of oxygen components in the flow field of pulse combustion wind tunnel and the analysis of air flow components at the outlet of engine combustion chamber is designed. On this basis, the internal flow field characteristics of the sampling probe and the freezing of gas chemical reactions are analyzed. The analysis results show that the air flow entering the probe is effectively cooled and the chemical reaction freezing can be realized. The wind tunnel test air flow is used to check the system, and the system control can meet the requirements of pulse wind tunnel test. The measured values of oxygen content in the air flow are in good agreement with the theoretical values, and the deviation is less than 5% or even as low as 0.4%. The system is used to directly measure the main gas components such as O _ 2, N _ 2 and CO2 in the gas at different positions at the outlet under the Mach number 2.6 flow condition and the direct combustion model combustion condition, and then the apparent combustion efficiency at each measuring point is estimated, and the variation is obtained. to a certain extent, the results reflect the fuel distribution in the combustion chamber.
【作者单位】：中国空气动力研究与发展中心吸气式高超声速技术研究中心;
【分类号】：V211.74

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