钢板超快速冷却条件下换热实验研究

采用汽雾射流冷却方式,在射流角为0°~60°时,研究了10 mm厚不锈钢板轧后超快速冷却过程中表面射流流动结构、换热区分布和钢板温降规律,分析了倾斜射流对钢板表面热流密度和冷速的影响.结果表明:射流角通过改变钢板表面滞止区和横向流区面积、水流密度、介质流动形态和流动速度,影响钢板表面换热形式和热流密度分布,进而影响超快速冷却冷速;射流角为30°时钢板平均冷速和临界热流密度均达到最大值,分别为146.5℃/s和2.75 MW/m~2.

Experimental Studies on Heat Transfer of Ultra Fast Cooling for Steel Plate

Spray jet cooling method was used to study the surface jet flow structure， heat transfer zone and plate temperature drop during the ultra fast cooling process for a steel plate with the thickness of 10mm， and the effects of inclination jet on heat flux and cooling rate of the plate surface were also analyzed， where the spray inclination angle was ranging from 0° to 60°. The results showed that the spray inclination angle can affect the heat transfer type of plate surface and heat flux distribution by changing plate surface stagnation zone and transverse flow zone’s area， water flow density， flow state and flow velocity， so that it will further influence the cooling rate of ultra fast cooling greatly. The average cooling rate and heat flux density reach the maximum values with 146.5℃/s and 2.75MW/m²， when the spray inclination angle is 30°.