CAJ | 학술논문

电厂疏水管路中过渡管段(大小头)因减薄而引起泄漏,汽蚀及流体冲刷的协同作用是重要的影响因素.利用计算流体动力学软件对某电厂疏水管道的局部减薄进行了仿真模拟,得到了大小头处损伤的分布规律.计算结果表明:阀门后大小头的小径端静压出现最小值,并低于汽化压强,从而产生汽蚀;另外,此处流体剪切应力达到最大值,加速了流体对材料的冲刷.针对以上现象,文中提出了控制疏水管道局部损伤的防护措施.
전엄소수관로중과도관단(대소두)인감박이인기설루,기식급류체충쇄적협동작용시중요적영향인소.이용계산류체동역학연건대모전엄소수관도적국부감박진행료방진모의,득도료대소두처손상적분포규률.계산결과표명:벌문후대소두적소경단정압출현최소치,병저우기화압강,종이산생기식;령외,차처류체전절응력체도최대치,가속료류체대재료적충쇄.침대이상현상,문중제출료공제소수관도국부손상적방호조시.
For the leakage of variable diameter drain pipe caused by local thinned area, the synergism of cavitation and erosion is regarded as the main factor. In order to obtain the distribution of damage, CFD code was used. The calculated result shows that static pressure reaches its minimum at the small-end of conical pipe behind the valve and is lower than the vaporization pressure, which will cause the cavitation, and maximum of shear stress appears at the same position, which accelerates the erosion effect of fluid. Furthermore, corresponding proposals are put forward to prevent the conical drain pipe from local damage.