Supersonic Flow Ignition by Plasma Torch and H2/O2 Torch
Supersonic Flow Ignition by Plasma Torch and H2/O2 Torch
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等离子炬和 H2/O2 炬的超音速流动点火
DOI：
10.2514/1.1760
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发表时间：
2004
影响因子：
1.9
通讯作者：
T. Mitani
中科院分区：
文献类型：
--
作者：
Kan Kobayashi;S. Tomioka;T. Mitani
对H2/O2火炬式点火器和等离子体火炬式点火器在超声速燃烧室中促进H2/空气混合气点火的有效性进行了理论分析和实验研究。首先，在氧等离子体火炬点火器的本体温度和本体自由基浓度估计的渐近分析。通过平衡计算得到了H2/O2火炬式点火器中的热力学参数。其次，气体采样进行，以确定点火剂的浓度和当量比的区域中的点火，即，在一个面向后的步骤的基础上的再循环区域。然后，利用H2/O2两步反应机理和上述结果，对该区域内混合物的着火时间进行了解析估算。结果表明，在给定的输入能量下，等离子体火炬点火器的点火促进效果优于H2/O2火炬点火器。然而，H2/O2火炬点火器也被期望充分促进点火，因为它很容易通过增加质量流量来增加输入能量。为此，在马赫数为2.5的气流中进行了H2/O2火炬式点火器的点火实验.与等离子体火炬点火器的结果比较表明，H2/O2火炬点火器也有足够的点火促进效果从分析结果预期。
The effectiveness of an H 2 /O 2 torch igniter, which injects H 2 /O 2 combustion gas, and a plasma torch igniter in promoting ignition of an H 2 /air mixture within a supersonic combustor was investigated analytically and experimentally. First, bulk temperature and bulk radical concentration in an O 2 plasma torch igniter were estimated by asymptotic analysis. Those in the H 2 /O 2 torch igniter were also obtained by equilibrium calculation. Second, gas sampling was conducted to determine the concentration of igniter injectant and the equivalence ratio in the region of ignition, namely, the recirculation region at the base of a rearward-facing step. Then, ignition time of the mixture in the region was analytically estimated by using a two-step H 2 /O 2 reaction mechanism and the results just-mentioned. The estimation showed that the ignition promotion effect of the plasma torch igniter was higher than that of the H 2 /O 2 torch igniter at a given input energy. However, the H 2 /O 2 torch igniter was also expected to sufficiently promote ignition because it was easy to increase the input energy by increasing the mass flow rate. Thus, an ignition experiment with the H 2 /O 2 torch igniter was conducted in Mach 2.5 airflow. Comparison of the results with those of the plasma torch igniters showed that the H 2 /O 2 torch igniter also had a sufficient ignition promotion effect as expected from analytical results.
影响因子：
4.4
作者：
T. Mitani;T. Kouchi
通讯作者：
T. Mitani;T. Kouchi