CAJ | 학술논문

在激光同轴送粉熔覆中,由于激光与粉末流相互作用,粉末流整体温度分布直接影响激光熔覆的质量.基于非预混燃烧模型,将激光相处理为连续性介质,粉末颗粒相看作离散相物质,建立了激光作用下粉末流的质量、动量和能量方程.用Fluent软件进行了不同激光功率和粉末流速度条件下粉末流整体温度场数值模拟,讨论了各种参数对温度场分布的影响.为了验证该模型的准确度,利用CCD比色测温方法测量了粉末流整体温度场分布.结果表明,数值模拟与CCD检测结果具有良好的一致性,数值模拟结果对激光熔覆具有指导意义.
재격광동축송분용복중,유우격광여분말류상호작용,분말류정체온도분포직접영향격광용복적질량.기우비예혼연소모형,장격광상처리위련속성개질,분말과립상간작리산상물질,건립료격광작용하분말류적질량、동량화능량방정.용Fluent연건진행료불동격광공솔화분말류속도조건하분말류정체온도장수치모의,토론료각충삼수대온도장분포적영향.위료험증해모형적준학도,이용CCD비색측온방법측량료분말류정체온도장분포.결과표명,수치모의여CCD검측결과구유량호적일치성,수치모의결과대격광용복구유지도의의.
In laser coaxial cladding, laser casing qualities are directly affected by temperature field of powder flow for the interaction between laser and powers. According to the model of non-premixed combustion, regarding laser beam as continuity medium phase and powder as disperse medium phase, the conservation equations of mass,momentum and energy are established in laser and powder flow. Computer simulations of temperature field in different parameters are finished using Fluent software. Some effects of laser cladding parameters on temperature distribution such as laser power and powder flow velocity are discussed. Temperature field distribution in the powder flow is measured by CCD camera. It is shown that simulation and experimental results agree well, numerical simulation of temperature field in powder flow is important for laser cladding.