(西安交通大學(xué) 機(jī)械學(xué)院， 西安 710049)
摘 要: 運(yùn)用流體力學(xué)、傳熱學(xué)以及相變等理論，建立數(shù)學(xué)模型描述金屬液滴與氣流的相互作用，計(jì)算了金屬液滴的飛行速度和溫度衰減過程。結(jié)果表明：金屬液滴飛行速度、溫度以及凝固程度是金屬液滴直徑、飛行距離的函數(shù)；金屬射流中固態(tài)金屬顆粒比例是金屬射流中金屬液滴質(zhì)量分布的函數(shù)；飛行距離600mm以內(nèi)，固態(tài)、半固態(tài)金屬顆粒所占比例不超過2%。
關(guān)鍵字: 電弧噴涂； 速度； 溫度； 數(shù)值計(jì)算
ZHU Dong-bo， ZHAO Wen-zhen， LU Bing-heng
（School of Mechanical Engineering， Xi′an Jiaotong University，
Xi′an 710049, P.R.China）
Abstract: An integral model for arc spray Zn-Al droplets in flight was developed using established theoretical principles of fluid mechanics， heat transmission and phase transformation. Mathematical models describe the interconnected processes of droplet-gas interactions in flight. The calculation result of Zn-Al droplets velocity and temperature shows that droplets velocity and temperature are function of flight distance and droplets diameter. Percentage of solid droplets in metal spray is a function of droplets size distribution. In flight distance(<600mm)， depending on size and cooling rate， the droplets in metal spray are completely liquid， partially solidified， or completely solidified，the percentage of partially solidified， or completely solidified in metal spray do not exceed 2%.
Key words: arc spray; velocity; temperature; numerical analysis
