Article
Thermodynamics
Jalal Salimi, Ali Reza Teymourtash, Mohammad Reza Aghdasi, Esmail Lakzian
Summary: The goal of this study is to find the optimal surface heating technique for a stationary cascade turbine blade in wet steam flow using a genetic algorithm. The research utilizes a numerical method that combines the two-dimensional Navier-Stokes equations with a SSTk-omega turbulence model, and solves nucleation and droplet growth equations using the Eulerian-Eulerian approach. The results show good agreement with established experiments, and it is found that there is an optimum surface heating rate to achieve the best performance of steam turbines.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
Mohammad Reza Aghdasi, Ali Reza Teymourtash, Esmail Lakzian
Summary: This study used genetic algorithm for shape optimization and obtained the suitable pitch to axial chord ratio for a cascade turbine blade. The modification of the Zweifel coefficient was innovatively employed to improve the performance of wet steam flow passing through the steam turbine cascade.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Chuang Wen, Yan Yang, Hongbing Ding, Chunqian Sun, Yuying Yan
Summary: A wet steam modeling was developed to solve the phase change process in steam turbine blade cascades, with results showing wet steam model is more accurate than dry gas model, and an appropriate trailing edge cutback can improve flow conditions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Guojie Zhang, Xiaogang Wang, Slawomir Dykas, Mohammad Ali Faghih Aliabadi
Summary: This research focuses on the numerical study of the effect of steam impurities, specifically salt particles, on non-equilibrium condensation phenomenon. The results show that the presence of salt particles significantly impacts two-phase variables and flow parameters, reducing water droplet production and entropy generation. The findings confirm that steam impurities have a significant effect on non-equilibrium condensation.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Xu Han, Jiandong Guan, Qiuliang Zhu, Zhengqi Chen, Bochuan Yao, Wensheng Zhao, Zhonghe Han
Summary: Secondary water droplets in the steam turbine wet steam stage can cause water erosion damage to the rotor cascade, affecting the turbine's operation and efficiency. Controlling the formation of a water film on the stator blade surface is crucial for improving efficiency and safety.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Amir Kafaei, Fahime Salmani, Esmail Lakzian, Wlodzimierz Wroblewski, Mikhail S. Vlaskin, Qinghua Deng
Summary: In order to enhance the efficiency of steam turbines, injecting hot steam between the blades in a 3D manner was studied in this paper. The optimal angle for injection holes was found to be -60 degrees, resulting in reductions of 40% in liquid mass fraction, 22% in condensation loss, and 1% in kinetic energy. The economic cost was calculated at 0.56 ($/hour) with a hot steam injection hole size of 0.07.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Pengfei Hu, Qingqiang Meng, Tiantian Fan, Lihua Cao, Qi Li
Summary: The high-speed impact of liquid droplets on blades in wet steam region seriously affects the safe operation of steam turbine. In this study, the distribution of droplet particles and their impact on blades were comprehensively considered. The results show that under the wet steam model, the blade displacement and equivalent stress vary more intensely over time compared to the ideal gas model.
Article
Thermodynamics
Amir Kafaei, Esmail Lakzian, Goodarz Ahmadi, Slawomir Dykas
Summary: This study investigates the effect of different hot steam injection hole arrangements on the performance of steam turbines and finds that the in-line no. 1 arrangement is the best design. Excessive kinetic energy loss due to hot steam injection can be prevented by decreasing the injection pressure.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Engineering, Chemical
Lianchen Xu, Xiaohui Jin, Zhen Li, Wanquan Deng, Demin Liu, Xiaobing Liu
Summary: This study investigated and visually observed the generation of inter-blade vortex in Francis turbines using a specific model. The research found that the size and strength of the inter-blade vortex are closely related to the unit speed of the turbine.
Article
Engineering, Multidisciplinary
N. Sitaram, B. V. S. S. S. Prasad, P. V. K. Yadav, B. Purushothama
Summary: Experimental investigations were conducted on a steam turbine rotor tip linear cascade to study the effect of Mach number on flow and pressure losses. The results showed that the impact of Mach number on various parameters was minimal, and wake self-similarity and turbulent boundary layers were observed.
INDIAN JOURNAL OF ENGINEERING AND MATERIALS SCIENCES
(2022)
Article
Engineering, Mechanical
Qiqi He, Song Xue, Hongmei He, Fengtao Hu, HongChen Gao, Wei Hu
Summary: Turbine blade, a crucial component in thermal power plants, often experiences premature failure. A broken blade in a power plant's low-pressure turbine unit caused an unplanned shutdown. Through various analysis methods, the failure cause of the steam turbine blade was identified. Macro morphology of the fracture was observed using optical light microscope (OLM), while micro characteristics were observed using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Mechanical properties were analyzed through room temperature tensile test and Charpy impact test. Results showed that the root cause of the blade fracture was a decrease in fatigue and rupture strength caused by high 8-ferrite content. Consistency between crack propagation direction and banded 8-ferrite direction further promoted crack initiation and prolongation, leading to fatigue fracture. Based on the test and analysis results, recommendations to prevent early failure of steam turbine blades are proposed.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Mechanical
Pascal Post, Benjamin Winhart, Francesca di Mare
Summary: The study investigates the influence of turbulence modeling approach on the overall modeling of turbulent condensing wet steam flows using a low-pressure steam turbine cascade as an example. The results show that LES provides much better matching of the measurement results compared to RANS and URANS, demonstrating its ability to better account for the unsteady nature of condensation process and its interaction with shock wave structure.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2021)
Article
Materials Science, Multidisciplinary
Jose Alfredo Rodrigez Ramirez, Christian Marisol Clemente Mirafuentes, Manuela Alejandra Zalapa Garibay, Juan Garcia C. Castrejon, Luis Gonzalo Guillen Anaya
Summary: The corrosion fatigue behavior of AISI 410 martensitic stainless steel used in steam turbine blade fabrication was studied using the EN technique under mechanical fatigue conditions. Pitting corrosion occurred in a simulated environment, generating sites for crack initiation and propagation. The presence of localized plastic deformation and the breakdown of the passive layer led to a significant increase in crack propagation velocity and reduced material lifespan.
Article
Engineering, Aerospace
Rio Baidya, Sven Scharnowski, Charitha M. de Silva, Manuj Awasthi, Christian J. Kaehler
Summary: The near wake of a circular cylinder in a high-Reynolds-number regime was investigated using particle image velocimetry. The study found that the mean wake features for subsonic and supersonic cases are very different, and the variation in observed wake width is due to the differing paths of eddies.
Article
Thermodynamics
Fan Wu, An Han, Wei Jiang, Yanan Yue, Danmei Xie
Summary: The complex flow field at low load has a significant impact on the aerodynamic performance of steam turbines. To improve performance under low mass-flow conditions, a design of bio-inspired steam turbine blades with biomimetic bumps on the suction side was proposed. Numerical simulation results showed that the bumps generated streamwise vortices, leading to a decrease in pressure on the suction side of the blade. This resulted in improved performance, reflected in the increased output torque.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Vladimir Gribin, Ilya Gavrilov, Aleksandr Tishchenko, Victor Tishchenko, Vitaliy Popov, Sergey Khomyakov, Roman Alexeev
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2018)
Article
Thermodynamics
Joerg Starzmann, Fiona R. Hughes, Sebastian Schuster, Alexander J. White, Jan Halama, Vladimir Hric, Michal Kolovratnik, Hoon Lee, Libor Sova, Miroslav St'astny, Marius Gruebel, Markus Schatz, Damian M. Vogt, Yogini Patel, Giteshkumar Patel, Teemu Turunen-Saaresti, Vladimir Gribin, Victor Tishchenko, Ilya Gavrilov, Changhyun Kim, Jehyun Baek, Xiaoming Wu, Jiandao Yang, Slawomir Dykas, Wlodzimierz Wroblewski, Satoru Yamamoto, Zhenping Feng, Liang Li
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2018)
Article
Thermodynamics
V. G. Gribin, A. A. Tishchenko, R. A. Alekseev, V. A. Tishchenko, I. Yu. Gavrilov, V. V. Popov
THERMAL ENGINEERING
(2020)
Article
Thermodynamics
V. G. Gribin, A. A. Tishchenko, R. A. Alekseev, V. A. Tishchenko, I. Yu. Gavrilov, V. V. Popov
THERMAL ENGINEERING
(2020)
Proceedings Paper
Physics, Multidisciplinary
R. A. Alekseev, V. G. Gribin, A. A. Tishchenko, I. Yu Gavrilov, V. A. Tishchenko, V. V. Popov
4TH ALL-RUSSIAN SCIENTIFIC CONFERENCE THERMOPHYSICS AND PHYSICAL HYDRODYNAMICS WITH THE SCHOOL FOR YOUNG SCIENTISTS
(2019)
Proceedings Paper
Physics, Multidisciplinary
R. A. Alekseev, V. G. Gribin, A. A. Tishchenko, I. Yu Gavrilov, V. A. Tishchenko, V. V. Popov
4TH ALL-RUSSIAN SCIENTIFIC CONFERENCE THERMOPHYSICS AND PHYSICAL HYDRODYNAMICS WITH THE SCHOOL FOR YOUNG SCIENTISTS
(2019)
Article
Thermodynamics
I. Yu Gavrilov, V. V. Popov
THERMAL ENGINEERING
(2019)
Article
Thermodynamics
V. A. Tishchenko, R. A. Alekseev
THERMAL ENGINEERING
(2019)
Proceedings Paper
Thermodynamics
V. G. Gribin, O. M. Mitrokhova, A. N. Paramonov, A. Y. Revenko
17TH CONFERENCE OF POWER SYSTEM ENGINEERING, THERMODYNAMICS AND FLUID MECHANICS
(2018)