Yang Zhou

China University of Mining and Technology

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Guoqing Zhou

China University of Mining and Technology

Gangqiang Kong

Hohai University

Qing Yang

Ministry of Agriculture and Rural Affairs

Yijiang Wang

China University of Mining and Technology

Bie Xiao-yong

Jiangsu Provincial Architectural Design and Research Institute (China)

He Cheng

China University of Mining and Technology

Guangsi Zhao

China University of Mining and Technology

Yukun Ji

China University of Mining and Technology

Hao Chen

China University of Mining and Technology

Xiang-you Shi

China University of Mining and Technology

Cooperative Institutions

China University of Mining and Technology

Hohai University

Chinese Academy of Sciences

Zhejiang University

University of Chinese Academy of Sciences

Southwest Jiaotong University

State Key Laboratory for Geomechanics and Deep Underground Engineering

Lanzhou University

Dalian University of Technology

University of Science and Technology of China

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Thermal Effects in Cryogenic Liquid Annular Seals—Part I: Theory and Approximate Solution

Journal of Tribology (1993)

Yang Zhou Luis San Andrés Dara W. Childs

A thermohydrodynamic (THD) analysis is introduced for calculation of the performance characteristics of cryogenic liquid annular seals in the turbulent flow regime. A full-inertial bulk-flow model is advanced for momentum conservation and energy transport. The liquid material properties depend on the local absolute pressure and temperature. Heat flow to the rotor and stator is modeled by bulk-flow heat transfer coefficients. An approximate analytical solution is obtained to the governing equations when the seal operates at a steady-state and concentric condition. The temperature-rise in the fluid film of a cryogenic liquid seal is found to be composed of four sources due to viscous dissipation, pressure extrusion work, surface heat transfer and kinetic energy variation. For incompressible adiabatic flows, the fluid temperature rises linearly along the axial direction. The approximate analytical solution provides a useful tool for preliminary design and a better understanding of seal performance. Full numerical predictions of load, leakage, temperature, and rotordynamic coefficients for a high speed liquid oxygen seal are given in Part II to show the importance of thermal effects on seal performance. The accuracy of the approximate concentric seal analysis is then demonstrated by comparison to the results from the full numerical solution.

10.1115/1.2921001

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Citations (35)

Occlusion and Shadow Detection of Large-scale True Orthophoto in Urban Area

Acta Geodaetica et Cartographica Sinica (2010)

Yang Zhou

When the traditional orthorectification methods are applied for urban large-scale orthophoto generation,many problems exist. For example,their true positions of most objects in urban area are distorted from the orthophoto. This distortion shows that buildings lean over a street. Recent years,some researchers addressed the concept of true orthophoto. This paper mainly discusses the problem of buildings' shadow and occlusion in urban area,addresses DBM-based occlusion and shadow detection for true orthophoto generation,and presents one methodology for true orthophoto generation based on the CSG building model. The study area located in downtown of Denver,Colorado has been chosen to verify this method. The experimental results demonstrated that the proposed method in this paper is effective for large scale urban orthophoto generation.

Orthophoto

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Design and control of single phase tubular permanent magnet linear motor

2021 24th International Conference on Electrical Machines and Systems (ICEMS) (2014)

Yang Zhou He Cheng Guojun Yu Xiao Liu Hao Chen

This paper introduces the design and control of a novel single phase tubular permanent magnet linear motor. With the finite element method and the FLUX software, the inductance waveform and the magnetic circuit at the special position are analyzed thoroughly. Although the conventional bridge power converter topology is used in the paper, the direction of the electric current is defined uniquely which also considers the magnetic field direction of the permanent magnet material. Based on the mechanical equations and the corresponding electromagnetic field equations for this topology of the motor, an outer frequency loop and an inner current loop are integrated for the stable output capability with a referred frequency. The outer loop adopts proportional-integral control algorithm to control the mover's oscillatory frequency and the inner current loop applies the fuzzy control to track the current reference value which is the output of the outer frequency loop. A reciprocation oscillatory motor platform is established and the main current waveform is gathered in experimental program. Meanwhile, the experimental results verify the feasibility and correctness of the designed novel single phase tubular permanent magnet linear motor and the proposed strategy.

Current loop

10.1109/icems.2014.7013771

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Citations (2)

Experiment Research on Embankment Deform Monitoring Using Distributed Optical Fiber Sensor

Applied Mechanics and Materials (2013)

Yang Zhou Ping Yu Zhu Xiao Fei Yan

To overcome shortcomings of traditional methods for detecting the embankment internal deformation, this paper puts forward the distributed optical fiber sensing technique to detect the embankment inner deep deformation. The method according to the optical fiber sensing mechanism, with Swiss Omnisens company produces the DiTeSt-202 strain/temperature optical fiber sensing analyzer, makes the cable arrangement, builds the monitoring program for the embankment deep deformation and real-time monitors the embankment, and uses Matlab to process and analysis data. The experimental results show that the feasibility of this scheme, guides the engineering practice.

Deformation monitoring

Embankment dam

10.4028/www.scientific.net/amm.341-342.1104

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Citations (1)

Numerical Study of Buoyancy Convection of Air under Permanent Magnetic Field and Comparison with That under Gravity Field

Mathematical Problems in Engineering (2014)

KeWei Song Wenkai Li Yang Zhou Yuanru Lu

Magnetothermal free convection of air in a square enclosure under a nonuniform magnetic field provided by a permanent neodymium-iron-boron magnet is numerically studied. The natural convection under the gravity field alone is also studied for comparison. The physical fields of magnetizing force, velocity, and temperature as well as the local distribution characteristic of Nusselt number are all presented in this paper. The results show that the buoyancy convection of air in the square enclosure under magnetic field is quite different from that under the gravity field. The local value of Nusselt number under the magnetic field supplied by a permanent magnet with a residual magnetic flux density of about 4.5 Tesla can reach a high value of about three times larger than the maximum local value of Nusselt number under the gravity field. Relatively uniform distributions of temperature gradient and Nusselt number can be obtained along the cold wall of the enclosure under the magnetic field. A permanent magnet with high magnetic energy product withBrreaching to 3.5 Tesla can play a comparative role on the averaged Nusselt number compared with that under the gravity environment.

Enclosure

10.1155/2014/494585

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Citations (1)

An analytical model for heat transfer outside a single borehole heat exchanger considering convection at ground surface and advection of vertical water flow

Renewable Energy (2021)

Yang Zhou Zihan Wu Kang Wang

Line source

10.1016/j.renene.2021.03.102

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Citations (22)

Thermal gradient–dependent fracture behavior of ice-rich frozen soils

Bulletin of Engineering Geology and the Environment (2021)

Xiaodong Zhao Wencan Jiao Yang Zhou

Temperature Gradient

10.1007/s10064-021-02269-4

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Citations (3)

Comments on the paper “New model to evaluate the effective thermal conductivity of three-phase soils, Fabio Gori, Sandra Corasaniti, International Communications in Heat and Mass Transfer, 47(2013)16”

International Communications in Heat and Mass Transfer (2021)

Zhaoxiang Chu Yang Zhou

Saturation (graph theory)

10.1016/j.icheatmasstransfer.2021.105241

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Citations (1)

Ramp Heating in High-Speed Transient Thermal Measurement With Reduced Uncertainty

Haiteng Ma Z. Wang L. Wang Q. Zhang Yang Zhou

The uncertainty associated with the convective heat transfer coefficient (HTC) obtained in transient thermal measurement is often high, especially in high speed flow. The present study demonstrates that the experimental accuracy could be much improved by an actively controlled ramp heating instead of the conventional step heating approach. A general design guideline for the proposed ramp heating method is derived theoretically and further demonstrated by simulation cases. This paper also presents a detailed experimental study for transonic turbine blade tip heat transfer. Repeatable, high-resolution tip HTC contour was obtained through transient IR measurement with the proposed ramp heating method. Detailed uncertainty analysis shows that the resulting HTC uncertainty level is much lower than the experimental data currently available in the open literature. The ramp heating approach is specially recommended to the high-speed heat transfer experimental research community to improve the accuracy of the transient thermal measurement technique.

Transient (computer programming)

10.1115/gt2015-43012

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Citations (5)

Development and Application of Numerical Simulation System of Gathering Cold Energy to Maintain Frozen Soil Roadbed's Stabilization

Journal of Highway and Transportation Research and Development (2005)

Bie Xiao-yong Yang Zhou Guangsi Zhao

Based on the thoughts of active cooling to keep the QinghaiTibetan Railway embankment stabilization and the digital need of the QinghaiTibetan Railway construction and management,the numerical simulation system of gathering cold energy to keep frozen soil roadbed's stabilization was developed.The system has integrated different methods to gather cold energy such as horizontal pipes and tilt pipes.According to each method different parameters are used.The system gives the temperature fields of the roadbed and the ground below after the finishing of the roadbed.The interface is friendly and the results are intuitionistic.

Ground freezing

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