摘要
超音速火焰喷涂粒子焰流速度对涂层的性能影响极大,但其实际速度很难确定,根据射流动力学原理,建立了多功能超音速火焰喷涂的焰流和粒子速度模型,并对焰流、WC-17Co和N iCrBSi喷涂粒子的速度进行了计算机仿真计算。结果表明:随喷涂距离增大,超音速焰流速度、温度不断下降,直至形成亚音速焰流;粒子的速度分布在300～800 m/s,它与焰流速度、粒子直径、粒子密度有关,在离喷枪出口200～400 mm范围粒子速度变化较小。
A mathematical model was established based on the principles of jet dynamics to deal with the velocities of the flame and particles of multifunctional high velocity oxy-fuel spraying.The velocities of flame as well as WC-17Co and NiCrBSi particles were simulated.Results show that the velocity and temperature of the flame decrease continuously with the increase of spraying distance.The velocity of the particles was in a range of 300～800m/s,and was dependent on flame velocity as well as diameter and density of the particles.When the spraying distance was within 200～400 mm,the velocity of particles changed slightly.
出处
《材料保护》
CAS
CSCD
北大核心
2011年第6期5-7,4,共3页
Materials Protection
关键词
火焰喷涂
粒子速度
多功能超音速
计算机仿真
oxy-fuel spraying
particle velocity
multifunctional high velocity
computed simulation
