摘要
介绍了采用热态试验和理论分析相结合的方法，对高速供热下的金属冲击加热过程所进行的研究。结果表明：选择适宜的炉膛高度以保证烧嘴喷口至被加热表面的相对距离Ｈ／ｄ在５～６的范围，并使烧嘴在高热负荷下燃烧以维持其气流喷口速度Ｗ在２００～２３０ｍ／ｓ的水平，即可有效地强化金属的加热过程；高速气流强烈的冲击作用使金属表面的对流传热率高达８０％，而且对流传热愈强，金属表面在加热后期出现反向辐射的时间就愈早。
his paper presents the study on metal shock reheating under the circumstance of highspeed heat-providing by using thermal test associated with theoretical analysis. The result shows that selecting appropriate furnace hearth height to make the relative distance (H/d) between jet tip and heated surface be at about 5～6, and making the nozzle burn at high heat load to maintain its jetting velocity at 200～300m/s can effectively strengthens metal heating. The intensive shock of high-speed gas stream make convective heat-transfer efficiency of metal surface be as high as 80 %. The stronger the convective heat-transfer, the earlier the back radiation of metal sufrace at later period of heating.
出处
《冶金能源》
1994年第3期29-34,共6页
Energy For Metallurgical Industry
关键词
高速烧嘴
冲击加热
金属
High-speed burner Shock reheating
