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本文运用FLUENT软件,通过大量的计算机模拟,研究了真空高压气淬炉中淬火气体压力、进口速度、气体类型对工件冷却性能的影响。通过对比氮气在0.45 MPa、0.6 MPa、1.0 MPa和1.5 MPa淬火压力下工件的冷却速度,量化了淬火压力对工件冷却速度的影响程度。氮气在0.6 MPa下,将气体速度由40 m/s增至60 m/s,工件冷却速度提高27%,但风机功率增加3.4倍。由于气体体积流量一定的情况下,淬火气体比热和密度的协同影响了换热系数的大小,通过计算机模拟了四种淬火气体氢气、氦气、氮气和氩气对工件冷却速度的影响,得出在相同气体压力和流量下,四种气体的冷却能力是:氮气>氢气>氦气>氩气;在消耗相同的风机功率下,密度小比热大的气体冷却能力高,四种气体的冷却能力依次是氢气>氦气>氮气>氩气。
In this paper, using FLUENT software, through a large number of computer simulation, the effect of quenching gas pressure, inlet velocity and gas type on the cooling performance of the workpiece in vacuum high-pressure gas quenching furnace was studied. By comparing the cooling rate of nitrogen under the quenching pressure of 0.45 MPa, 0.6 MPa, 1.0 MPa and 1.5 MPa, the effect of quenching pressure on the cooling rate of the workpiece was quantified. The nitrogen gas velocity increased from 40 m / s to 60 m / s at 0.6 MPa, the cooling rate of the workpiece increased by 27%, but the fan power increased 3.4 times. Due to the synergetic effect of specific heat and density of quench gas on the heat transfer coefficient under certain gas volume flow rate, the effects of four quench gas hydrogen, helium, nitrogen and argon on the cooling rate were simulated by computer Under the same gas pressure and flow rate, the cooling capacities of the four gases are: nitrogen> hydrogen> helium> argon; at the same fan power, Cooling capacity followed by hydrogen> helium> nitrogen> argon.