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Huo W.,Xian Jiaotong University | Li J.,Xian Jiaotong University | Yang J.,Xian Jiaotong University | Yang J.,Shanghai Electrical Power Generation Technology R and nter | And 2 more authors.
Proceedings of the ASME Turbo Expo | Year: 2013

The cooling effect of the internal bypass cooling system in high pressure cylinder of an ultra-supercritical steam turbine using the conjugation of the flow calculation and heat transfer method was numerically studied in this paper. Three-dimensional Reynolds-Averaged Navier-Stokes(RANS) solutions and k -ε turbulent model with scalable wall function were used to analyze the cooling performance based on the CFD software ANSYS-CFX. The details of the flow pattern of the fluid domains and temperature distributions of the solid domains in the system were illustrated. The temperature field of the high pressure cylinder was compared between the steam cooling case and the non-cooling case without consideration of the steam cooling of the internal bypass cooling system. The main conclusion that can be drawn out of this research work is that the high pressure inner casing and the large part of axial thrust balance piston can be effectively cooled by the internal bypass cooling system. In addition, the resulting temperature distributions of the inner casing are uniformed compared to the non-cooling case. The temperature of the outer casing of the high pressure cylinder increases a little compared to the non-cooling case. Copyright © 2013 by Solar Turbines Incorporated.


Li J.,Xian Jiaotong University | Yang J.,Xian Jiaotong University | Yang J.,Shanghai Electrical Power Generation Technology R and nter | Shi L.,Shanghai Electrical Power Generation Technology R and nter | And 2 more authors.
Proceedings of the ASME Turbo Expo | Year: 2012

The contact force between single bristle and shaft surface, as well as full bristle pack and rotor surface were analytically investigated. The contact force model between single bristle and shaft surface was established using cantilever beam theory. The eccentric whirling motion was taken into account in the present numerical model. The numerical method for the normal contact force and tangential friction force between the seal and shaft surface was derived. The effects of the eccentric whirling motion, bristle lay angle and bristle interference on the contact force of brush seals were conducted using the developed analytical model and method. The variation characteristics of the normal contact force and tangential frictional force torque between single bristle and rotor surface along the circumferential direction with different bristle lay angle, eccentric whirling motion and bristle interference was illustrated and analyzed. The numerical analysis results of the contact force between full bristle pack and shaft surface show that the contact force decreases at first and increases later with increasing the bristle lay angle at the fixed bristle interference and eccentric whirling motion. The contact force obtains the minimum when the bristle lay angle equals to 54o at the eccentric whirling motion 0.5mm and bristle pack interference 1.5mm. Copyright © 2012 by ASME.


Yang R.,Shanghai Electrical Power Generation Technology R and nter | Yang J.,Shanghai Electrical Power Generation Technology R and nter | Peng Z.,Shanghai Electrical Power Generation Technology R and nter | Shi L.,Shanghai Electrical Power Generation Technology R and nter | And 6 more authors.
American Society of Mechanical Engineers, Power Division (Publication) POWER | Year: 2011

The aerodynamic performance and internal flow characteristics of the last stage and exhaust hood for steam turbines is numerically investigated using the Reynolds-Averaged Navier-Stokes (RANS) solutions based on the commercial CFD software ANSYS CFX. The full last stage including 66 stator blades and 64 rotor blades coupling with the exhaust hood is selected as the computational domain. The aerodynamic performance of last stage and static pressure recovery coefficient of exhaust hood at five different working conditions is conducted. The interaction between the last stage and exhaust hood is considered in this work. The effects of the non-uniform aerodynamic parameters along the rotor blade span on the static pressure recovery coefficient of the non-symmetric geometry of the exhaust hood are studied. The numerical results show that the efficiency of the last stage has the similar values ranges from 89.8% to 92.6% at different working conditions. In addition, the similar static pressure recovery coefficient of the exhaust hood was observed at five working conditions. The excellent aerodynamic performance of the exhaust hood was illustrated in this work. Copyright © 2011 by ASME.


Shao S.,Xian Jiaotong University | Deng Q.,Xian Jiaotong University | Shi H.,Xian Jiaotong University | Feng Z.,Xian Jiaotong University | And 2 more authors.
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | Year: 2013

A numerical investigation on full-three-dimensional steady viscous flow fields in the last three stages and low pressure exhaust hood (LPEH) of a steam turbine was conducted using the commercial computational flow dynamics software CFX. The flow fields in the last three stages were analyzed in detail. The results show that a separation caused by the adverse pressure gradient occurs at the hub section near the trailing edge of the last stage rotor at 40% of the design mass flow rate. Moreover, a separation caused by the negative attack angle occurs at the tip section near the leading edge of the last stage rotor at 30% of the design mass flow rate. A separation also caused by the negative attack angle occurs near the leading edge of the last stage stator at 10% of the design mass flow rate. In addition, the absolute outlet flow angle of the last stage rotor at the tip section increases with the decrease in volume flow rate, and the radial location of the reverse flow can be determined by the turning point of the absolute outlet flow angle in the blade radial direction.


Xu F.,Shanghai Electrical Power Generation Technology R and nter | Cheng K.,Shanghai Electrical Power Generation Technology R and nter | Peng Z.-Y.,Shanghai Electrical Power Generation Technology R and nter
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2010

The vibration characteristics of the full circle self-lock damping blade was analyzed with the numerical analysis method on the basis of the primary parameters of shroud configuration, including thickness, Width, inclination, contact angle and contact gap between contact areas of the adjacent shrouds, and the influence of the shroud configuration's parameters on vibration characteristics were obtained. The conclusions for the influences of the thickness parameter are consistent with that of the measurement results. Analysis results show that there are definite rules that the primary parameters of the shroud configuration how to affect the triple point resonance of the full-circle structural blade. Analyzing the blade's vibration characteristics is of guiding significance for the design of the full-circle self-lock blade.

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