真空高压气淬炉中淬火气体压力、流速和类型对工件冷却性能影响的数值模拟  

Numerical simulation of the effects of pressure,speed and type of quenching gas on the workpiece cooling performance in vacuum high-pressure gas quenching furnace

作　　者：王志坚[1] 尚晓峰[1] 

机构地区：[1]沈阳航空航天大学机电工程学院,辽宁沈阳110136

出　　处：《真空》2011年第6期76-80,共5页Vacuum

基　　金：沈阳市科技计划项目(F11-264-56);沈阳航空航天大学博士启动基金

摘　　要：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。Effects of the quenching gas pressure, inlet speed and gas type on the workpiece cooling performance in the vacuum high pressure gas quenching furnace was studied by a large number of computational simulation with the software FLUENT. By comparison of the workpiece cooling rates under different nitrogen quenching pressure of 0.45MPa, 0.6MPa, 1.0MPa and 1.SMPa, the influence degree of quenching pressure on the workpiece cooling rate was obtained. When the quenching pressure was 0.6MPa and the inlet speed increased from 40m/s to 60m/s, the cooling rate was improved by 27%, but the fan power increased 3.4 times. When the gas volumn flow was certain, both the specific heat and density affected the heat transfer coefficient. By computational simulation of the effects of hydrogen, helium, nitrogen and argon four quenching gases on the cooling rate of workpieces, we knew that under the same pressure and flow, the cooling capacity of four gases is nitrogen〉hydrogen〉helium〉argon, but when the fan power is the same, the cooling capacity of low-density and high-specific heat gas is higher, and the cooling capacity of four gases is hydrogen〉helium〉nitrogen〉argon.

关 键 词：真空高压气淬 温度场 流场 冷却速度 

分 类 号：TG155.1[金属学及工艺—热处理]