CAJ | 학술논문

准确地计算灭弧室内气流场特性对于SR断路器优化设计有重要意义。基于真实气体模型（user-definedrealgasmodel，UDRGM），运用线性插值与UDRGM相结合的方法来导入sR的气体属性，并与流场控制方程组联合求解，研究了SF6断路器简化灭弧室冷态气流场的特性规律。通过分析监测点处的物理量发现，触头分开过程中，灭弧室内整体压力差不断增加，气体密度分布主要取决于气压的变化；在喷口区域，气压最大值出现在动触头端部中心位置，各监测点处的气压与马赫数受触头位置的影响较大，当触头运动到监测点时，马赫数与气压会发生跃变，而喷口内部两触头问的气压变化梯度却很小。结果表明，基于UDRGM建立的SF6断路器冷态气流场分析新方法可有效地提高计算精度，也为热态气流场的研究提供了基础。
준학지계산멸호실내기류장특성대우SR단로기우화설계유중요의의。기우진실기체모형（user-definedrealgasmodel，UDRGM），운용선성삽치여UDRGM상결합적방법래도입sR적기체속성，병여류장공제방정조연합구해，연구료SF6단로기간화멸호실랭태기류장적특성규률。통과분석감측점처적물리량발현，촉두분개과정중，멸호실내정체압력차불단증가，기체밀도분포주요취결우기압적변화；재분구구역，기압최대치출현재동촉두단부중심위치，각감측점처적기압여마혁수수촉두위치적영향교대，당촉두운동도감측점시，마혁수여기압회발생약변，이분구내부량촉두문적기압변화제도각흔소。결과표명，기우UDRGM건립적SF6단로기랭태기류장분석신방법가유효지제고계산정도，야위열태기류장적연구제공료기출。
It is important to calculate the gas flow field characteristics of an arc quenching chamber for optimization design of a SF6 circuit breaker. Based on the user-defined real gas model （UDRGM）, the linear interpolation method was used to import the SF6 gas properties. Then by coupling the gas properties with the governing equations of the flow field, the cold flow field in the arc quenching chamber for the SF6 circuit breaker was investigated. The results show that the total pressure difference in the chamber increases continuously during the contact motion process and the density distribution mainly depends on the pressure. In the nozzle region, the maximum pressure appears at the tip center of the moving contact, and the pressure and the Mach number change abruptly when the contact approaches the monitoring points, but the pressure gradient remains small between the two contacts. It demonstrates that the new method based on UDRGM can improve the calculation precision of the cold flow field for SF6 circuit breakers effectively, which provides the basis for the study of hot flow field.