Article
Engineering, Mechanical
Qianqian Li, Shiyang Li, Peng Wu, Bin Huang, Dazhuan Wu
Summary: The study redesigned a double-suction centrifugal pump with high vibration and noise demands by increasing flow uniformity at the impeller discharge through combinations of multiple parameters. The results showed a significant reduction in pressure fluctuations by increasing the number of impeller blades, radial gap, and optimizing the staggered arrangement. The redesigned pump demonstrated a substantial decrease in pressure fluctuation intensity, indicating the effectiveness of the modifications in reducing pressure fluctuations.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Jianyi Zhang, Hao Yang, Haibing Liu, Liang Xu, Yuwei Lv
Summary: Pressure fluctuations in high-speed centrifugal pumps are influenced by structural design and flow structure, and are closely related to blade frequency. Pressure fluctuations at the guide vane and interference region are closely related to vortices at the impeller outlet, and vary at different flow rates.
Article
Acoustics
Rajavamsi Gangipamula, Pritanshu Ranjan, Ranjit S. Patil
Summary: This paper presents a comparative study on the Air Borne Noise (ABN) and Flow Induced Noise (FIN) of a double suction centrifugal pump. The study includes experiments and numerical simulations to explore the relationship between FIN and ABN, as well as the prediction methods for FIN and ABN.
Article
Engineering, Marine
Jiaxing Lu, Qi Chen, Xiaobing Liu, Baoshan Zhu, Shouqi Yuan
Summary: In this study, a combination of numerical and experimental methods is used to investigate the pressure fluctuations induced by internal flow instabilities in a centrifugal pump. The results provide insights into the complex flow state and establish an effective method for detecting the flow instabilities using pressure fluctuations at the pump outlet.
Article
Thermodynamics
Arihant Sonawat, Sung Kim, Sang-Bum Ma, Seung-Jun Kim, Ju Beak Lee, Myo Suk Yu, Jin-Hyuk Kim
Summary: This study investigates the pressure pulsation issues of double suction centrifugal pumps using CFD methods, identifying the most effective impeller stagger angle for reducing pulsations and exploring the combination of split volute arrangement to suppress pressure pulsations.
Article
Engineering, Marine
Baoling Cui, Xiaotian Han, Yinchu An
Summary: In this paper, the unsteady cavitation flow in a low-specific-speed centrifugal pump with an inducer was studied using numerical simulations. It was found that the regions with larger vapor volume fraction in the inducer and impeller increased with decreasing NPSHa. Furthermore, under very low NPSHa, the pump head dropped drastically and distinct back flows were observed near the suction surface of the blade and impeller outlet.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Yong Liu, Dezhong Wang, Hongjuan Ran, Rui Xu, Yu Song, Bo Gong
Summary: This study used the RANS and CFD simulation method to analyze the formation mechanism of head hump in a double-suction centrifugal pump under partial load conditions. It revealed that the diffuser stall causing a change in the impeller capacity for work is the main reason for hump formation. The study also identified the critical flow structure inducing hump and its inducing mechanism, providing a key theoretical basis for suppressing hump and offering a reference for other pumps.
Article
Engineering, Chemical
Xijie Song, Dunzhe Qi, Lijuan Xu, Yubin Shen, Wei Wang, Zhengwei Wang, Yan Liu
Summary: The study found that the flow rate significantly affects the erosion of double-suction pump impellers, with erosion rate positively correlated to flow rate. Vortices and secondary flows in the impeller increase particle concentration at the trailing edge, intensifying impact erosion.
Article
Chemistry, Multidisciplinary
Denghao Wu, Songbao Yao, Renyong Lin, Yun Ren, Peijian Zhou, Yunqing Gu, Jiegang Mou
Summary: The study conducted a numerical investigation of a double-blade centrifugal pump, revealing the presence of large vortices at low flow rates and high vorticity near the blade trailing edge and volute tongue.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Hao Wang, Yibin Li, Yunshan Kong, Shengfu Zhang, Teng Niu
Summary: This paper analyzes the influence of different inlet angles of the blade on the rotating stall of the double-suction centrifugal pump's impeller using the numerical simulation method of Shear Stress Transform (SST). The results show that a small angle of attack can effectively suppress the impeller rotation stall and improve the design point head and efficiency. The research results provide theoretical support for stall research and hydraulic performance optimization of a double-suction pump.
Article
Mechanics
Rajavamsi Gangipamula, Pritanshu Ranjan, Ranjit S. Patil
Summary: This study investigates the impact of various geometrical and flow parameters on the rotor-stator interaction in a centrifugal pump. The focus is on reducing pressure pulsations by modifying the vane trailing edge profile. Numerical experiments are conducted using detached eddy simulation, and the results show that the intensity of the jet-wake flow phenomenon and its interaction with the volute tongue can be reduced by adjusting the trailing-edge profile. The findings have implications for optimizing the design of centrifugal pumps.
Article
Green & Sustainable Science & Technology
Maxime Binama, Kan Kan, Hui-Xiang Chen, Yuan Zheng, Da-Qing Zhou, Wen-Tao Su, Xin-Feng Ge, Janvier Ndayizigiye
Summary: This study investigates the flow structures formation mechanism of PATs under varying impeller rotational speed through CFD-backed numerical simulations. The results show that PAT flow and pressure fields deteriorate with decreasing machine influx, with increased impeller rotational speed alleviating pressure pulsation levels under high-flow conditions but worsening them under part-load conditions. These findings contribute to a better understanding of PAT flow dynamics and help in solving existing technical issues in the long run.
Review
Engineering, Chemical
Lulu Zheng, Xiaoping Chen, Jinglei Qu, Xiaojie Ma
Summary: This paper discusses the pressure fluctuations in centrifugal pumps in detail, including the characteristics without clearance flow and with consideration for clearance flow. Measures to reduce the fluctuations and forces are also summarized to improve the operational reliability of the pumps. Moreover, the review presents the research highlights and future research perspectives in the field of pressure fluctuations, which is beneficial to the stable operation of centrifugal pumps in engineering.
Article
Engineering, Chemical
Wenjie Peng, Ji Pei, Shouqi Yuan, Jiabin Wang, Benying Zhang, Wenjie Wang, Jiaxing Lu
Summary: This study conducted a numerical simulation of the inner flow in a multi-stage double-suction centrifugal pump using the detached eddy simulation method. The velocity field distribution characteristics and pressure fluctuation propagation law were considered. The principle of entropy generation was used to quantify and compare the energy loss of different components. The results indicate that the pump's operational efficiency is reduced due to the presence of unstable flow structures in the first-stage impeller and vortical structures in the back-channel.
Article
Engineering, Mechanical
Wei Wang, Boxing Liu, Jinling Lu, Jianjun Feng, Lefu Zhang, Xingqi Luo
Summary: This study investigates the impact of primary geometric parameters of inlet pipes on the performance and pressure fluctuations of a centrifugal pump. Experimental measurements and numerical simulations reveal that the bending of the inlet pipes significantly reduces the pump head and efficiency, with a larger corner angle and smaller turning radius leading to greater performance loss. The bending of the inlet pipes also induces pressure imbalance and low-frequency disturbance in the suction chamber. The findings suggest that minimizing the corner angle and installing a long straight pipe downstream of the elbow can mitigate the negative effects of bent inlet pipes on pump performance and pressure fluctuations.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Energy & Fuels
Jing Dong, Zhongdong Qian, Biraj Singh Thapa, Bhola Thapa, Zhiwei Guo
Article
Engineering, Civil
Pengfei Wu, Daniel Horna Munoz, George Constantinescu, Zhongdong Qian
JOURNAL OF HYDRAULIC RESEARCH
(2020)
Article
Thermodynamics
Simin Shen, Zhongdong Qian, Bin Ji, Ramesh K. Agarwal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2019)
Article
Engineering, Mechanical
Zhiwei Guo, Jingye Pan, Zhongdong Qian, Bin Ji
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2019)
Article
Thermodynamics
Guo Zhiwei, Wang Chihang, Qian Zhongdong, Luo Xianwu, Xia Weipeng
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2020)
Article
Thermodynamics
Zilong Zhao, Zhiwei Guo, Zhongdong Qian, Qian Cheng
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2020)
Article
Energy & Fuels
Simin Shen, Zhongdong Qian, Bin Ji
Article
Ecology
Junjie Liu, Bin Dong, Wangzi Zhou, Zhongdong Qian
ECOLOGICAL ENGINEERING
(2020)
Article
Energy & Fuels
Hongliang Wang, Zhongdong Qian, Di Zhang, Tao Wang, Chuan Wang
Article
Thermodynamics
Weixiang Ye, Zhongdong Qian, Renfang Huang, Xiaojun Li, Zuchao Zhu, Xianwu Luo
Summary: This study numerically investigates the flow instability in a centrifugal pump with a straight inlet pipe under various part-load conditions using a partially averaged Navier-Stokes model. By comparing numerical results with experimental data, the model's validity was confirmed. Internal flows in pumps were analyzed using different methods, providing insights into the unstable flows and positive slope phenomenon in centrifugal pumps.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2021)
Article
Engineering, Mechanical
Weixiang Ye, Zuchao Zhu, Zhongdong Qian, Xianwu Luo
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Marine
Xiaorui Bai, Huaiyu Cheng, Bin Ji, Xinping Long, Zhongdong Qian, Xiaoxing Peng
Article
Engineering, Multidisciplinary
Zehao Li, Zhongdong Qian, Bin Ji
APPLIED MATHEMATICAL MODELLING
(2020)
Proceedings Paper
Construction & Building Technology
Zilong Zhao, Zhongdong Qian, Zhiwei Guo, Pengfei Wu
29TH IAHR SYMPOSIUM ON HYDRAULIC MACHINERY AND SYSTEMS
(2019)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.