摘要
利用计算流体动力学(CFD)模型分析超音速火焰喷涂喷枪内气体流动行为。结果表明:RNGk-ε湍流模型计算出的气体流场波动较大,与实际不符;标准k-ε模型和Realizablek-ε模型所模拟计算出的结果更能描述喷枪气体动力学。模拟结果显示:燃烧室中回流区的存在增强了气流的湍流扰动,为改善燃料与助燃气的混合创造了条件;氧气流量变化对喷枪内温度场和压力场分布的影响较速度场更大,流量过大(0.006 kg/s)或过小(0.003 kg/s)造成的震荡剧烈,流量值为0.00388 kg/s较为恰当。
A computational fluid dynamic （CFD） model was developed to investigate the gas flow field in the process of HVOF thermal spraying. The simulation results show that the modeled gas flow field of RNG k-ε model has large fluctuation, while the results of standard k-ε model and Realizable k-ε can descriie the gas dynamics reasonably. The simulation indicates that several existing backflow areas in combustion chamber enhance the turbulence, which provides advantages for continuous combustion. The variation of the mass flow rate of oxygen has more influence on pressure and temperature than velocity. Mass flow of 0.003 88 kg/s is more appropriate for gas flow field than flow of 0.006 kg/s or 0.003 kg/s.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2012年第2期39-42,共4页
Ordnance Material Science and Engineering
