文章信息/Info

Title:

Simulation of Atomization of High Speed Steel Powder Prepared by Electrode Induction Melting and Aeroatomization

作者:

峰山; 張浩

內(nèi)蒙古工業(yè)大學(xué)材料科學(xué)與工程學(xué)院，內(nèi)蒙古 呼和浩特 010051

Author(s):

FENG Shan; ZHANG Hao

Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China

關(guān)鍵詞:

數(shù)值模擬; 一次霧化與二次霧化; 高速鋼液流; 粒度分布; 拉瓦爾噴嘴

Keywords:

Numerical simulation;  Primary and secondary atomization;  High speed steel flow;  Particle size distribution;  laval nozzle;  hartmann resonator

分類號:

TF123

文獻標(biāo)志碼:

A

摘要:

電極感應(yīng)熔化氣霧化(Electrode Induction Melting Gas Atomization, EIGA)是制備超潔凈無夾雜物的先進制粉技術(shù)。霧化過程十分復(fù)雜，數(shù)值模擬能進行可視化呈現(xiàn)。本文根據(jù)拉瓦爾噴嘴結(jié)構(gòu)原理，運用SolidWorks建模軟件設(shè)計出超音速噴嘴模型，并導(dǎo)入流體力學(xué)Fluent軟件進行兩相流模擬。高速鋼液流的霧化過程分為一次霧化與二次霧化，模型選取精度更高的大渦模擬法（Large Eddy Simulation，LES）并結(jié)合自適應(yīng)網(wǎng)格方法，進行不同液流直徑（3mm，4mm，5mm）模擬，當(dāng)出口質(zhì)量流量趨于穩(wěn)定，視為完成一次霧化模擬過程。二次霧化是在一次霧化的基礎(chǔ)上建立子模型，并提取粒徑為0.5mm的單液滴進行模擬。結(jié)果表明超音速氣體射流對高速鋼液流進行沖擊霧化，在一次霧化的過程中，隨著高速鋼液流直徑的加大，高速鋼液流破碎成液滴群的平均粒徑尺寸也變大。二次霧化將采用更加精密的網(wǎng)格以捕捉破碎霧化后更加細(xì)小的液滴，模擬液滴粒徑群的平均尺寸分布約在170μm左右，完成對單液滴的全過程霧化模擬。對企業(yè)的高效生產(chǎn)和后續(xù)實驗工作的進行做輔助參考。

Abstract:

Electrode Induction Melting Gas Atomization (EIGA) is an advanced technology for producing ultra-clean powder free from inclusions. The atomization process is highly intricate and can be visualized through numerical simulation. In this study, a supersonic nozzle model based on the structure principle of Laval nozzle was designed using SolidWorks modeling software, and two-phase flow simulation was conducted using FLUENT software. The atomization process of high-speed steel liquid flow was divided into primary and secondary atomization stages. Large Eddy Simulation (LES) with higher accuracy was chosen as the model, and the adaptive mesh method was employed to simulate different liquid flow diameters (3mm, 4mm, 5mm). Upon reaching a stable outlet mass flow rate, the atomization simulation process was considered complete. A secondary atomization model was established based on the primary atomization, and a single droplet with a particle size of 0.5mm was extracted for simulation. The results indicate that the supersonic gas jet effectively atomizes the high-speed steel liquid flow. As the diameter of the high-speed steel liquid flow increases, so does the average particle size of the resulting droplets broken by it. For secondary atomization, a more precise mesh will be used to capture smaller droplets after crushing and atomizing; consequently, the average size distribution of simulated droplet particles is approximately 170 μm.The statement serves as a supplementary guide for the effective facilitation and subsequent implementation of the enterprise’s experimental endeavors