CAJ | 학술논문

以磁流体动力学(MHD)为基础建立了考虑器壁侵蚀影响的低压断路器中的电弧的数学模型.在传统的质量、动量和能量守恒方程的基础上增加了器壁材料的浓度方程,考虑了器壁材料的烧蚀对气体的热动力学特性和传输系数的影响,并且采用"视角因数法"计算到达器壁的辐射能量.利用基于有限容积法的商业软件对上述模型进行求解,得出灭弧室内温度场、浓度场、气流场的分布情况以及电压随时间的变化过程.仿真结果表明,由于灭弧室内"漩涡"的存在使得电弧后方的聚合物蒸气浓度大于电弧前方的聚合物蒸气浓度;由于产气材料的影响,电弧的最大电压增加了19.2%;产气材料对电弧运动有加速作用,由于产气材料的影响,电弧的平均运动速度增加了20.1%.实验结果验证了仿真模型的合理性.
이자류체동역학(MHD)위기출건립료고필기벽침식영향적저압단로기중적전호적수학모형.재전통적질량、동량화능량수항방정적기출상증가료기벽재료적농도방정,고필료기벽재료적소식대기체적열동역학특성화전수계수적영향,병차채용"시각인수법"계산도체기벽적복사능량.이용기우유한용적법적상업연건대상술모형진행구해,득출멸호실내온도장、농도장、기류장적분포정황이급전압수시간적변화과정.방진결과표명,유우멸호실내"선와"적존재사득전호후방적취합물증기농도대우전호전방적취합물증기농도;유우산기재료적영향,전호적최대전압증가료19.2%;산기재료대전호운동유가속작용,유우산기재료적영향,전호적평균운동속도증가료20.1%.실험결과험증료방진모형적합이성.
The mathematical model of 3-dimentional air arc plasma considering the ablation of lateral walls is set up based on magnetic hydro-dynamics (MHD). The mass concentration equation is introduced to the model on the basis of traditional mass, momentum and energy equations. The influence of wall ablation on the thermodynamic and transport properties is considered. The method of "view factors" is used to calculate the radiation reaching the lateral wall. By adopting the commercial computational fluid dynamics (CFD) package based on control-volume method, the above MHD model is solved and the distribution of temperature field, concentration field, flow field and electrical potential field in the arc chamber is calculated. The simulation results indicate that the vapor concentration behind the arc column is higher than that in front of the arc column because of the existence of "vortex" in the arc chamber. The use of gassing material causes arc voltage increase 19.2%, and causes the average arc velocity increase 20.1%. The experimental results prove the validity of the arc model.