Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure
Апстракт
A steam turbine trip is followed by a prompt closure of stop valves in front of the turbine and consequently to a pressure rise in the main steam pipeline. This steam hammer transient leads to the generation of intensive fluid dynamic forces that act along the pipeline axis and induce additional dynamic loads on the main steam pipeline. It is a common practice to assume a simultaneous closure of all stop valves in the safety analysis of the main steam pipeline. In the present paper computer simulations and analyses of the fluid dynamic forces are performed for several scenarios that take into account the possibility of delayed closure of the stop valve in front of the turbine. The influence of the failure of the steam by-pass line opening is considered too. The results show that the delay of the stop valve closure increases the maximum intensity of fluid dynamic force in the pipeline segment in front of the stop valve and decreases the intensity of fluid dynamic forces in segments alon...g the pipeline. The failure of the by-pass line to open leads to prolonged steam pressure and fluid dynamic forces oscillation in pipeline segments. The simulations were performed with the in-house computer code based on the method of characteristics for the solving of the hyperbolic system of PDE that represent the mass, momentum and energy balance equations of the 1-D, compressible and transient fluid-flow. The obtained results are a support to safety analyses of thermal power plants under transient conditions.
Кључне речи:
static and dynamic loads / safety analysis / calculation methodologyИзвор:
Thermal Science, 2020, 24, 3, 2213-2224Издавач:
- Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
Финансирање / пројекти:
- Напредне аналитичке, нумеричке и методе анализе примењене механике флуида и комплексних система (RS-MESTD-Basic Research (BR or ON)-174014)
DOI: 10.2298/TSCI190915426S
ISSN: 0354-9836
WoS: 000532472600027
Scopus: 2-s2.0-85086880999
Колекције
Институција/група
Mašinski fakultetTY - JOUR AU - Stevanović, Vladimir AU - Milivojević, Sanja AU - Petrović, Milan M. PY - 2020 UR - https://machinery.mas.bg.ac.rs/handle/123456789/3294 AB - A steam turbine trip is followed by a prompt closure of stop valves in front of the turbine and consequently to a pressure rise in the main steam pipeline. This steam hammer transient leads to the generation of intensive fluid dynamic forces that act along the pipeline axis and induce additional dynamic loads on the main steam pipeline. It is a common practice to assume a simultaneous closure of all stop valves in the safety analysis of the main steam pipeline. In the present paper computer simulations and analyses of the fluid dynamic forces are performed for several scenarios that take into account the possibility of delayed closure of the stop valve in front of the turbine. The influence of the failure of the steam by-pass line opening is considered too. The results show that the delay of the stop valve closure increases the maximum intensity of fluid dynamic force in the pipeline segment in front of the stop valve and decreases the intensity of fluid dynamic forces in segments along the pipeline. The failure of the by-pass line to open leads to prolonged steam pressure and fluid dynamic forces oscillation in pipeline segments. The simulations were performed with the in-house computer code based on the method of characteristics for the solving of the hyperbolic system of PDE that represent the mass, momentum and energy balance equations of the 1-D, compressible and transient fluid-flow. The obtained results are a support to safety analyses of thermal power plants under transient conditions. PB - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd T2 - Thermal Science T1 - Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure EP - 2224 IS - 3 SP - 2213 VL - 24 DO - 10.2298/TSCI190915426S ER -
@article{ author = "Stevanović, Vladimir and Milivojević, Sanja and Petrović, Milan M.", year = "2020", abstract = "A steam turbine trip is followed by a prompt closure of stop valves in front of the turbine and consequently to a pressure rise in the main steam pipeline. This steam hammer transient leads to the generation of intensive fluid dynamic forces that act along the pipeline axis and induce additional dynamic loads on the main steam pipeline. It is a common practice to assume a simultaneous closure of all stop valves in the safety analysis of the main steam pipeline. In the present paper computer simulations and analyses of the fluid dynamic forces are performed for several scenarios that take into account the possibility of delayed closure of the stop valve in front of the turbine. The influence of the failure of the steam by-pass line opening is considered too. The results show that the delay of the stop valve closure increases the maximum intensity of fluid dynamic force in the pipeline segment in front of the stop valve and decreases the intensity of fluid dynamic forces in segments along the pipeline. The failure of the by-pass line to open leads to prolonged steam pressure and fluid dynamic forces oscillation in pipeline segments. The simulations were performed with the in-house computer code based on the method of characteristics for the solving of the hyperbolic system of PDE that represent the mass, momentum and energy balance equations of the 1-D, compressible and transient fluid-flow. The obtained results are a support to safety analyses of thermal power plants under transient conditions.", publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd", journal = "Thermal Science", title = "Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure", pages = "2224-2213", number = "3", volume = "24", doi = "10.2298/TSCI190915426S" }
Stevanović, V., Milivojević, S.,& Petrović, M. M.. (2020). Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure. in Thermal Science Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 24(3), 2213-2224. https://doi.org/10.2298/TSCI190915426S
Stevanović V, Milivojević S, Petrović MM. Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure. in Thermal Science. 2020;24(3):2213-2224. doi:10.2298/TSCI190915426S .
Stevanović, Vladimir, Milivojević, Sanja, Petrović, Milan M., "Fluid dynamic forces in the main steam pipeline of thermal power plant upon stop valves closure" in Thermal Science, 24, no. 3 (2020):2213-2224, https://doi.org/10.2298/TSCI190915426S . .