Numerical Simulation for Effect of Powder Carrier Gas on Flow Field and Particle Impact Velocity in Cold Spraying

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Numerical Simulation for Effect of Powder Carrier Gas on Flow Field and Particle Impact Velocity in Cold Spraying

更新时间：2025-07-09

- Numerical Simulation for Effect of Powder Carrier Gas on Flow Field and Particle Impact Velocity in Cold Spraying
- Vol. 46, Issue 7, Pages: 82-86(2012)
- 作者机构：
  
  1. 重庆大学低品位能源利用技术及系统教育部重点实验室,重庆,400030
  2. 重庆大学动力工程学院,重庆,400030
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG174.442
- Online First：10 July 2012，
  
  Published：2012
- 稿件说明：
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Numerical Simulation for Effect of Powder Carrier Gas on Flow Field and Particle Impact Velocity in Cold Spraying[J]. 2012, 46(7): 82-86.
DOI：

Numerical Simulation for Effect of Powder Carrier Gas on Flow Field and Particle Impact Velocity in Cold Spraying[J]. 2012, 46(7): 82-86. DOI：

摘要

通过建立二维数值模型

利用计算流体力学软件进行数值模拟

研究了送粉气流压力和温度对冷喷涂过程中流场及粒子速度的影响.结果表明:喷涂中不可忽略送粉气流对流场及粒子速度的影响; 为将粉末注入喷管

送粉气流的出口压力不能小于出口处的主气流压力

但增大送粉气流压力会使得进入喷管渐缩段的送粉冷气体流量增大

从而排挤高温主气流

同时也降低喷管气体流动的滞止焓

导致喷管喉部声速减小

不利于粒子加速; 增加主气流温度对粒子加速效果不明显

而增加送粉气流温度可有效提高粒子撞击基板的速度

进而提高粉末粒子的沉积效率.

Abstract

A two-dimensional numerical model is established and numerical simulation with computational fluid dynamics(CFD)software FLUENT is conducted to investigate the effect of the powder deliver gas on flow field and particle velocity inside and outside supersonic nozzle in cold spraying process. It is found that the powder deliver gas with higher pressure and lower temperature than main stream gas exerts significant effects on the flow field and the particle velocity. The inlet pressure of the powder deliver gas must be higher than that of the main stream gas to inject the particles into the nozzle. However

increasing the pressure of the powder deliver gas will result in the increase in the flow rate of the cold powder deliver gas to squeeze out the high temperature main gas. Then the stagnation enthalpy of the gas in the nozzle also decreases

which leads to the reduction in the speed of sound at the nozzle throat and impedes the acceleration of particles. At this time

the increase in the main gas temperature does not significantly affect the acceleration of particles

while the increase in the temperature of powder deliver gas effectively improves the particles' impact velocity and deposition efficiency.

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Keywords

references

ALKIMOV A P, PAPYRIN A N, KOSAREV V F, et al. Gas dynamic spraying method for applying a coating: US, 5302414 [P]. 1994-04-12.

KOSAREV V F, KLINKOV S V, ALKHIMOV A P, et al. On some aspect of gas dynamics of the cold spray process [J]. Journal of Thermal Spray Technology, 2003, 12(2): 265-281.

ASSADI H, GARTNER F, STOLTENHOFF T, et al. Bonding mechanism in cold gas spraying [J]. Acta Materialia, 2003, 51(15): 4379-4394.

CHAMPAGNE V K, HELFRITCH D J, LEYMAN P F, et al. The effects of gas and metal characteristics on sprayed metal coatings [J]. Modelling and Simulation in Materials Science and Engineering, 2005, 13(7): 1119-1128.

LI Wenya, LI Changjiu. Optimal design of a novel cold spray gun nozzle at a limited space [J]. Journal of Thermal Spray Technology, 2005, 14(3): 391-396.

LI Wenya, LIAO Hanlin, WANG Hongtao, et al. Optimal design of a convergent-barrel cold spray nozzle by numerical method [J]. Applied Surface Science, 2006, 253(2): 708-713.

NING Xianjin, WANG Quansheng, MA Zhuang, et al. Numerical study of in-flight particle parameters in low-pressure cold spray process [J]. Journal of Thermal Spray Technology, 2010, 19(6): 1211-1217.

KLINKOV S V, KOSAREV V F, SOVA A A, et al. Deposition of multi component coatings by cold spray [J]. Surface and Coatings Technology, 2008, 202(24): 5858-5862.

YAKHOT Y V, ORSZAG S A. Renormalization group analysis of turbulence: basic theory [J]. Journal of Scientific Computing, 1986, 1(1): 3-51.

MORSI S A, ALEXANDER A J. An investigation of particle trajectories in two-phase flow systems [J]. Journal of Fluid Mechanics, 1972, 55(2): 193-208.

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