基于数值模拟方法的阀门冲刷损伤分析

Valve Erosion Damage Analysis under Approach of Numeral Simulation

通过数值模拟方法,开展阀门在不同运行工况和不同阀程的模拟计算工作,分析阀门内部组件包括阀芯、阀笼和阀座的冲刷损伤情况。阀门不同开启程度直接影响冲刷损伤程度和位置分布。阀芯距离阀座20 mm时,阀芯迎流面冲刷损伤最严重;开启度较小时（2~20 mm）,阀芯侧面及锥面冲刷最剧烈,且损伤程度与开启度成反比;开启度较大时（〉40 mm）,阀笼出流孔处冲刷最剧烈。同样流速条件下,阀门开启度与冲刷损伤情况成反比,阀芯锥形面和阀笼出水口易于受到冲刷损伤。

Under the approach of numeral simulation, this paper firstly aims to carry out the simulating calculation work of value under different operating conditions and value lift, and then analyzes the erosion damage of the internal components of the value, which include value core, cage and seat. From this research, we can find that the extent and the location of the erosion are directly affected by the opening degree of the value. When the distance between the value core and seat is deliberately 20mm, the upstream face of the value core erodes most seriously. When opening degree is small （2-20）, the side face and conical surface are scoured the most, and the erosion degree is inversely proportional to its opening degree. When the opening degree is larger （40mm）, the cage orifice is eroded the most. Under the same flowing condition, the opening degree of the value is inversely proportional to the degree of erosion, and the conical surface of the value core and the cage outlet is vulnerable to erosion.