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测定了五孔喷头射流速度的衰减速率。测定结果表明,由于中孔射流和边孔射流的边界条件不同,因而它们的速度衰减速率不同。当中孔和边孔的直径相等时,在正常的枪位下,射流速度中孔比边孔大一倍。为了充分地利用五孔喷头的射流对熔池的有效和均匀的搅拌作用,要求作用于熔池面时,中孔射流的速度应等于或略大于边孔射流的速度,为此设计五孔喷头时应使中孔面积(A_中)小于每个边孔面积(A_边)。测定结果得出A_中/A_边应为0.6～0.8。
The decay rate of the jet velocity of the five-hole nozzle was measured. The results show that due to the different boundary conditions of the jets and the side jets, their speed decay rates are different. When the diameter of the middle hole and the side hole are equal, under the normal gun position, the jet hole speed is twice as large as the side hole. In order to make full use of the jet of five-hole nozzle on the molten pool of effective and uniform stirring, the role of the surface of the molten pool required, the jet speed should be equal to or slightly larger than the edge jet speed, for this design five-hole nozzle Make the mesopore area (A_max) smaller than the perforation area (A_side). Determination results A_ 中 / A_ edge should be 0.6 ~ 0.8.