设计了喷射压强(p)与喷射表面流量密度(qs)作为独立参数的7050铝合金末端喷水淬火实验,研究了p,qs和喷嘴大小(d)对喷水表面换热系数的影响。结果表明,表面换热系数在喷射端面温度为100~150℃时具有最大值(hmax),hmax波动范围为20000~50000 W·m-2·℃-1;建立了反映p和qs影响换热系数规律的hmax-p-qs三维关系图;采用喷射表面面积与喷嘴面积的比值k反映喷嘴大小对换热系数的影响,建立了hmax-k-qs三维关系图;hmax-p-qs和hmax-k-qs关系图能为喷水淬火参数(p,qs,k等)设计提供参考。
End-quench test of 7050 aluminum alloy by spraying water with independent parameters of pressure(p) and average volumetric flux over spraying area(qs) was designed.Effect of parameters of p,qs and nozzle diameter(d) on heat transfer coefficient was studied.The results show that the maximum value of heat transfer coefficient(hmax) always occurs when the spraying surface tempera-ture is at 100~150℃,and the scale of hmax is 20000~50000W·m-2.℃-1.The 3-D diagram of hmaxqs-p was established,which reflects the effect of parameters of p and qs on heat transfer.The established 3-D diagram of hmax-k-qs,in which k represents ratio of spra-ying surface area to cross-section of nozzle,shows the effect of d on heat transfer.The diagrams of hmax-p-qs and hmax-k-qs are helpful to select quenching parameters(p,qs,k,et al) by spraying water.