坡度条件下湍流扩散火焰形态的实验研究

Experimental Study on the Turbulent Diffusion Flame under Slope Conditions

本文以湍流扩散火焰为研究对象,在不同坡度及热释放速率条件下开展了火焰形态参数演化的实验研究。结果表明,当坡度在10°~15°范围内上升,火焰附着长度的增加主要是由于火焰两侧空气卷吸差异引起的压差。火焰附着长度和水平火焰长度之间呈现出较好的线性关系,火焰附着范围可通过火焰长度及火焰倾斜角来表征。当坡度为0°和40°时,无量纲火焰长度和无量纲热释放速率之间满足幂律关系;相对于坡度为0°时,40°时火焰长度随热释放速率的增长速率较为缓慢。

This work investigates the characteristics of turbulent diffusion flame under different slope and heat release rate conditions.The experimental results show that the flame attachment length increases with increasing slope angle in the range of 10°15°,which is induced by the pressure difference due to air entrainment on both sides of the flame.There is a linear correlation between flame attachment length and horizontal flame length.The range of flame attachment can be characterized by flame length and flame tilt angle.For slope angles of 0°and 40°,the correlation between flame length and heat release rate fits the power law.Compared with the slope of 0°,the flame length increases slowly with the heat release rate for the slope of 40°.