Simulation and experimental research based on carrier gas flow rate on the influence of four-channel coaxial nozzle flow field

• Main Authors: Shi Rui Guo, Qian Qian Yin, Lu Jun Cui, Xiao Lei Li, Ying Hao Cui, Bo Zheng, Yan Long Cao, Wen Han Zeng
• Format: Article
• Language: English
• Published: SAGE Publishing 2020-11-01
• Series: Measurement + Control
• Online Access: https://doi.org/10.1177/0020294020964232

This paper investigates the influence of carrier gas flow on the external flow field of coaxial powder feeding nozzle. FLUENT software was adopted to establish gas-solid two-phase flow. The simulation of powder stream field under different carrier gas flow was also carried out. Results show that the larger the flow of carrier gas is, the higher the gas flow field velocity at the nozzle outlet is. At the same time, the concentration at the convergence point is lower, and the convergent point is maintained at 0.015 m. Under the condition of 4 L/min, the powder flow convergence is good. When it exceeds 4 L/min, powder spot diameter increases. The experiment of powder aggregation and laser cladding forming were completed, which shows that the forming effect is the best one under the condition of 4 L/min. It is consistent with the simulation analysis results and has a high reference to the optimization of the process parameters of coaxial nozzle.