煤油富燃燃气旋转爆震燃烧实验研究

Experimental Investigation on Rotational Detonation Combustion with Fuel-Rich Gases of Kerosene

关键词:  旋转爆震  煤油  富燃燃烧  实验  传播

Key words:  Rotational detonation  Kerosene  Fuel-rich combustion  Experiments  Propagation

摘要:

为了了解煤油富燃燃气旋转爆震燃烧的过程及其特点，采用液体煤油一次燃烧后的富燃燃气与富氧空气二次爆震燃烧的方案，对0.51~1.29余气系数条件下的旋转爆震燃烧过程开展了实验研究。实验研究结果表明：与液体煤油相比，煤油富燃燃气能够在更低氧含量的富氧空气中实现旋转爆震波的稳定传播。氧气质量含量为29%，余气系数为0.74时，煤油富燃燃气与富氧空气形成的旋转爆震波的传播速度均值为926.3m/s。贫氧条件下，随着空气流量增大，旋转爆震波的传播速度先减小后增大，其最小值为氧浓度降低与空气流量增大对爆震波传播速度影响的平衡点。本实验范围内，该平衡点对应的氧气质量含量和余气系数分别为35%与0.92。

Abstract:

In order to know the processes and characteristics of the rotational detonation combustion with kerosene fuel-rich gases, the experiments were accomplished by using the scheme of the secondary detonation combustion with kerosene fuel-rich gases and oxygen-rich air under the excessive air coefficient from 0.51 to 1.29. The experimental results show that the stable propagation of rotational detonation wave can be realized at lower oxygen concentration with the fuel-rich gases of kerosene and oxygen-rich air contrast to liquid kerosene. At the condition of 29% oxygen mass concentration and 0.74 air coefficient, the average velocity of the rotational detonation wave is 926.3m/s. The velocity of the rotational detonation wave decreases first and then increases with the increased air flow rate under the oxygen-poor condition, and the minimum velocity is the balance of the influence of the oxygen concentration decrease and the air mass flow increase. Within the tests of this paper, the mass fraction and the excessive air coefficient corresponding to the critical value are 35% and 0.92, respectively.