Assessment of influence of the form of the central camera on the current of steam and creep of the hull of the adjusting valve of the turbine

• Main Authors: Шульженко, Н. Г., Колядюк, А. С.
• Format: Article
• Language: Russian
• Published: Інститут енергетичних машин і систем ім. А. М. Підгорного Національної академії наук України 2015
• Subjects: calculation; current of steam; creep; system of steam distribution; turbine; УДК 629.735; расчет; течение пара; ползучесть; система парораспределения; турбина; розрахунок; течія пари; повзучість; система паророзподілення; турбіна
• Online Access: https://journals.uran.ua/jme/article/view/51275

The characteristics of a current of steam are numerically calculated in system of steam distribution and the intense deformed state and creep of the hull of the valve of the K-325 steam turbine in the stationary mode for two options of the central camera of the valve. Speeds, temperature and a vapor pressure on the walls of the hull are defined on the basis of numerical solution of the equations of Navier-Stokes in three-dimensional statement. The semi empirical Menter model of turbulence was applied. A program complex ANSYS/CFX was used. It was established that the shape of the central chamber affects the distribution of the flow of steam through RK1 and RK3. The equations are integrated creep explicit Euler scheme. We used the model of implicit creep hardening, which takes into account the initial and steady creep. The effect of the form of the central chamber on the characteristics of the control valve body strength. The results of the research indicate that the maximum cumulative creep deformation can not be the cause of cracking after 35,000 hours of robots. Solution of the problem of creep housing for two variants of the central chamber in three-dimensional statement showed that the strength characteristics of a second embodiment of the valve body is preferred because in the central chamber maximum creep deformation in two times less than in the first embodiment of the valve body.