Wanrong Wu

Central South University

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i-10 index

Research Trends

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Co-Authors

Xiangjing Liang

Zhujiang Hospital

Lei Lou

China Automotive Technology and Research Center

Qianhua Hao

Hunan University of Humanities, Science and Technology

Guangtian Tian

Central South University

Binghui Qiu

Southern Medical University

Xian-zhong Mao

Nanjing University of Information Science and Technology

Guoyi Lu

Central South University

Lei Lou

Hebei University of Technology

Songlai Wang

Hunan University of Science and Technology

Xiaoyu Lei

Jilin Agricultural University

Cooperative Institutions

Central South University

National Taiwan University

Chinese Academy of Sciences

Aerospace Information Research Institute

Beijing Institute of Big Data Research

Zhejiang University

Tsinghua University

National Yang Ming Chiao Tung University

Dalian University of Technology

National Central University

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Analysis of the Cutting Features of the Damaged Rock by Shock Disturbance

The Open Petroleum Engineering Journal (2016)

Lei Lou Wanrong Wu Xiangjing Liang

This article aims to study the effects of shock-disturbed cracks on the cutting features of cone bits. By utilizing the Walsh’s model, a crack model was established for the damaged rock surrounding the induced hole, the intrusive coefficient of the cone bit was derived, and the drilling rate equation around the induced hole was formulated. The effects of crack density and disturbance frequency on elastic modulus, intrusive coefficient, and cutting force were studied. With an increase in crack density, both the effective elastic modulus and the intrusive coefficient decreased. Under a certain range of internal friction angle, with an increase in crack density, the drilling rate increased. Under a certain axial load, as the disturbance frequency increased, the cutting force of one-cone bits decreased.

Cone (formal languages)

10.2174/1874834101609160159

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Citations (1)

Simulation Analysis of Concrete Pumping Based on Smooth Particle Hydrodynamics and Discrete Elements Method Coupling

Materials (2022)

Wang Chen Wanrong Wu Guoyi Lu Guangtian Tian

With an increase of suction efficiency of fresh concrete pumping in confined spaces, the laminar flow state will be damaged by the return flow caused by distribution value direction changes and concrete gravity. This is a fact, but one which is rarely studied. In this work, the flow state, flow velocity, and suction efficiency of fresh concrete pumping are simulated using the coupled smooth particle hydrodynamics and Discrete Elements Method (SPH-DEM). The rheological parameters and Herschel-Bulkley-Papanastasiou (HBP) rheological model are adopted to simulate fresh concrete in the numerical simulation model. The study reveals that the error between the slump experimental result and that obtained by the HBP model is negligible. A model is therefore established for numerical simulations of the suction efficiency of fresh concrete pumping. An experimental concrete pumping platform is built, and the pressure and efficiency data during pumping are collected. A comparison of the numerical simulation with experimental results shows that the error is less than 10%.

Particle (ecology)

10.3390/ma15124294

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Citations (5)

CFD-Based Cavitation Research and Structure Optimization of Relief Valve for Noise Reduction

IEEE Access (2022)

Wanrong Wu Binghui Qiu Guangtian Tian Xiaoning Liao Tao Wang

The cavitation flow of the cartridge pilot-operated relief valve's main valve port was numerically simulated and studied using Computational Fluid Dynamics (CFD) in our research, and the relief valve structure was modified to decrease cavitation noise. The findings indicate that cavitation in the relief valve occurs mostly downstream of the main valve port and is linked to the wall. Cavitation generation is influenced by the jet at the valve port. The closer the high-speed jet at the valve port is to the valve's inner wall, the more readily cavitation occurs. Conversely, there is less cavitation. This paper reports the effect of the forms and parameters of the main port structure on the jet angle and the morphology of cavitation. The structure of the spool's annular groove has a considerable influence on the cavitation attached to the spool wall and the valve sleeve wall, whereas the outlet position of the relief valve mostly impacts the intensity of cavitation near the valve sleeve wall. Based on this, the relief valve's optimized structure is designed, with which the maximum vapor volume fraction and total vapor volume of the cavitation flow are considerably decreased for various inlet pressures and spool openings. The results of the experiment show that following optimization, the noise of the relief valve drops dramatically, confirming that optimizing the structure has a beneficial impact on decreasing cavitation noise.

Port (circuit theory)

Gate valve

10.1109/access.2022.3184449

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Citations (12)

Data sets used in the study "To supplement estuaries turbidity theory: An investigation of low turbidity zones in estuaries "

Zenodo (CERN European Organization for Nuclear Research) (2020)

Wanrong Wu Linlin Wang Xiaoyu Lei Xian-zhong Mao

This is the data sets used in the study "To supplement estuaries turbidity theory: An investigation of low turbidity zones in estuaries "

Turbidity

10.5281/zenodo.3947495

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Citations (0)

Lamb Wave Directional Sensing with Piezoelectric Fiber Rosette in Structure Health Monitoring

Shock and Vibration (2019)

Songlai Wang Wanrong Wu Yiping Shen Hui Li Binlong Tang

Directional piezoelectric sensors can detect the Lamb wave propagation direction to locate damage in structural health monitoring (SHM). The directivity of the round piezoelectric fiber is exploited with a 0°/45°/90° rosette configuration to acquire flexural Lamb wave signals. The directional response of the piezoelectric fiber under narrowband tone‐burst excitation is theoretically deduced. Experimental tests are conducted to demonstrate the directivity and the frequency response property of the piezoelectric fiber under different excitation central frequencies in comparison with the MFC, rectangular piezoelectric sheet, and circular piezoelectric disc. Continuous wavelet transform (CWT) is applied to extract the maximum response amplitude information of the acquired Lamb wave signal at a central frequency. Experimental test results indicate that the piezoelectric fiber is capable to be used as a Lamb wave directional sensor than other piezoelectric sensors. A numerical estimation method for the Lamb wave propagation direction is proposed by defining an error function between the theoretical and experimental normalized response amplitude. The proposed method is generally applicable for different rosette configurations. Experimental results validate the accuracy of the proposed estimation method. The research results are significant to design or select the piezoelectric sensor to measure Lamb wave signals.

Lamb waves

Directivity

Structural Health Monitoring

Narrowband

10.1155/2019/6189290

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Citations (4)

Research on Identification of the Noise and Vibration of a Decanter Centrifuge

Lei Lou Wanrong Wu Yun Yang Xiangjing Liang

Identification of noise and vibration is essential in dual-rotor systems with slightly different rotating speeds. This paper investigates the noise and vibration of a decanter centrifuge. Experimental investigations on a horizontal decanter centrifuge indicate that noise is correlated with the vibration in the Z axis. Noise can be classified as mechanical, fluid, air, or coupling noise. Increasing the spiral vane angle reduces mechanical and coupling noise. The optimal angle for a spiral blade is 8°to 10°. Increasing the screw-blade thickness reduces coupling noise. These findings are important in correlation studies on noise and vibration and in optimizations on the structure of a decanter centrifuge.

Centrifuge

10.1109/fgcn.2014.16

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Numerical and experimental simulation of damaged rock with randomly oriented cracks by shock disturbance

Journal of Vibroengineering (2016)

Wanrong Wu Lei Lou

The aim of this study is to investigate the effect of shock-disturbed cracks on the dynamic fragmentation of granite. Considering the complex behavior of rock materials, the Walsh’s model was revisited and extended by including the stress effect required to close an initially open crack and examining the unloading process in detail. This analysis leads to closed-form expressions for loading and unloading portions of the effective Young’s modulus, as functions of the crack density, characteristic aspect ratio, and crack friction coefficient. Subsequently, the effective Young’s modulus and cutting force are simulated and the influence of cracks is studied. The analysis results with different crack density and disturbed frequency are compared in terms of effective Young’s modulus and cutting force. Finally, the tool and damaged rock model with randomly oriented cracks by shock disturbed at a different frequency was demonstrated by the test. The good agreement between the simulation results and experimental data demonstrates the validity of the simulation method.

10.21595/jve.2016.16741

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Comparison of Combustion Models in Cleanroom Fire

Journal of Mechanics (2008)

Yuhui Huang Huan-Yu Shiu Shih-Chieh Chang Wanrong Wu S.-L. Chen

Abstract In this paper, the cleanroom fire simulation in a semi-conductor factory is investigated by using the commercial computational fluid dynamics (CFD) code. We using three different combustion models in the fire simulation. The combustion models including the volume heat source (VHS) model, the eddy break-up (EBU) model and the presumed probability density function (prePDF) model are considered to predict the cleanroom fire. The turbulence models coupled with different combustion models, while the radiation model is coupled with the turbulent combustion processes. Additionally, the discrete transfer radiation method (DTRM) is used in the global radiation heat exchange. For the fire simulation, the different combustion models are evaluated for their performance and compared with the experimental data from the literature to verify. Thus, these numerical simulations can be adopted as a useful tool to design and optimize the smoke control strategy in cleanroom fire.

Cleanroom

Large-Eddy Simulation

10.1017/s172771910000232x

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Citations (9)

Theoretical and Experimental Studies on Oil Injected Twin Screw Air Compressor under Unload Conditions

IOP Conference Series Earth and Environmental Science (2019)

Xiangjing Liang Wanrong Wu

The working process of twin screw air compressor under unload conditions was analyzed. Mathematical model describing the working process of oil injected twin screw compressor under unload conditions was established based on the laws of perfect gas and standard thermodynamic relations, considering the effects of oil injection, gas-oil heat transfer, internal leakage etc. A simulation model of screw air compressor system based on MATLAB was built up, and the effects of rotational speed and discharge pressure etc. on the performance under unload conditions were analyzed. The experiment was carried out to validate the model by a comparison between the results of the simulation model and testing. The simulation and testing results both showed that volumetric efficiency increased with the increase of rotational speed, when the discharge pressure was reduced. The shaft power increased with the increase of discharge pressure and rotational speed. The flow rate increased with the reduction of discharge pressure and increase of rotational speed. This model can be used for performance prediction under unload conditions and it provided reference for the high efficiency and energy saving operation of screw compressors.

Discharge pressure

Air compressor

Axial Compressor

Reciprocating compressor

Volumetric efficiency

10.1088/1755-1315/252/3/032118

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Citations (2)

Research on Rheological Behavior of Fresh Concrete Single-cylinder Pumping Based on SPH-DEM

Research Square (Research Square) (2023)

Wanrong Wu Wang Chen Guoyi Lu Jiaqian Wang Guangtian Tian

Abstract In contrast to traditional approaches to simulating fresh concrete, the model applied here allows issues such as liquid phase and the motion of sub-scale particles to be considered.The rheological behavior of fresh concrete materials was investigated, and the slump test and pumping process of fresh concrete were simulated by combining the smooth particle hydrodynamics coupled with discrete units method.Based on Bi-viscosity model and Bingham model, linear and nonlinear fitting of rheometer data and the derivation equations were educing.Bi-viscosity model and the Bingham model were compared in slump test. The results show that the Bi-viscosity model is more accurate in simulation, and the error percentage is less than 10%. The Bi-viscosity model was used to simulate and predict the results of slump experiment, and the influence of rheological parameters on the slump velocity and shape was obtained. The simulation analysis model of concrete single-cylinder pumping is established, and the experimental and simulation analysis models are compared. The results show that the SPH-DEM pumping pressure prediction is very close to the experimental results.

Concrete slump test

Particle (ecology)

Experimental data

10.21203/rs.3.rs-3212263/v1

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