Unstructured tetrahedral meshes are used to simulate the flow field inside high pressure combined valves of a 600mw ultra supercriticalsteam turbine under the nominal condition.
P122 steel has high thermal stability, can meet the requirements of high temperature and high pressuresteam for 1000mw ultra supercritical units, but has poor weldability.
P 122钢具有较高的热稳定性，满足1000 MW超超临界机组高温高压蒸汽的要求，但是其可焊性较差。