L Li

Xi'an Jiaotong University

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i-10 index

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Peng Shu

Xihua University

Yuanyang Zhao

Qingdao University of Science and Technology

J. Shen

University of Science and Technology Beijing

Xueyuan Peng

Xi'an Jiaotong University

Gaoxuan Bu

Xi'an Jiaotong University

X-m Wu

Shanghai Electric (China)

Z-P Feng

Affiliated Hospital of Guizhou Medical University

Huagen Wu

Xi'an Jiaotong University

Li Wang

Beihang University

Ziwen Xing

Xi'an Jiaotong University

Cooperative Institutions

Xi'an Jiaotong University

Shanghai Electric (China)

Beijing Institute of Technology

Tongji University

Qingdao University of Science and Technology

Hefei General Machinery Research Institute (China)

University of Science and Technology Beijing

Institute of Physics

Tianjin University of Commerce

Northwestern University

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Research on the reliability of a scroll compressor in a heat pump system

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy (2004)

Yuanyang Zhao L Li Huagen Wu Peng Shu J. Shen

The scroll compressor is used in heat pump and refrigeration system equipment because of important features such as its compact size, high efficiency, low vibration and noise level, etc. In the refrigeration cycle the scroll compressor runs smoothly and perfectly, but in the heat pump cycle some problems appear because of deterioration in the working condition. The effect of different factors such as atmospheric condition, electric voltage fluctuation, the configuration of the scroll compressor, etc., on the running reliability of the heat pump system are discussed in this paper, thermodynamic behaviour is examined and some basic design concepts for running reliability of the scroll compressor in the heat pump system are pointed out. Experimental results show that the temperature difference is about 10 K between the gas discharged from the outlet of the compressor and the wound wire of the motor in a high-pressure shell compressor. Calculated and test results show good agreement. The wound wire temperature of the motor in a low-pressure shell is much lower than that in a high-pressure shell scroll compressor. Hence, the low-pressure shell scroll compressor has higher running reliability than the high-pressure one.

Scroll compressor

Thermal expansion valve

Reciprocating compressor

10.1243/0957650041761874

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Citations (0)

Experimental measurement of axial clearance in scroll compressor using eddy current displacement sensor

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science (2008)

Qichao Yang L Li Yuanyang Zhao Peng Shu

This paper describes a method by using eddy current displacement sensor for the measurement of axial clearance in a water-lubricated scroll air compressor. The basic physical principle of the sensor is reviewed. An effective experimental configuration is established and the test procedure is designed to acquire proper data. The output signal which gives us useful waveforms is obtained by the data acquisition program based on virtual instrument technology. The actual tested results show that the eddy current sensor has high sensitivity and preferable static and dynamic performances. The actual axial clearance of the scroll air compressor under a working condition was measured and the tested results showed that the axial clearance is larger than that in refrigeration scroll compressor. In addition, the frequencies of signal pulse also reflect the change in rotational speed by analysing the output voltage signals. The actual experimental results could reflect the real situation of axial clearance of the scroll air compressor. It is of significance to further study on the relationship between the axial clearance and the performance of the scroll air compressor.

Scroll compressor

Tip clearance

SIGNAL (programming language)

Axial Compressor

Eddy-current sensor

10.1243/09544062jmes778

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Citations (5)

Investigation of the vapour–liquid two-phase flow in the low-pressure cylinder of a 1000 MW nuclear power steam turbine

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy (2013)

L Li J-d Yang Wei You X-m Wu Z-P Feng

The vapour–liquid two-phase flow in the low-pressure cylinder of a 1000 MW nuclear steam turbine has been investigated. Firstly, a comparative study of the flows with equilibrium and non-equilibrium condensation is described. The vapour extraction and moisture removal processes are included in the calculations to simulate the actual operating conditions in the low-pressure cylinder. Differences in the thermodynamic expansion lines, and in the distributions of wetness and degree of reaction, for equilibrium and non-equilibrium flow calculations are discussed. Secondly, the deposition of the fog and coarse water droplets in the last stage stator is investigated computationally. An empirical approach, together with the predictions of the non-equilibrium flow calculation, is used to redistribute the spanwise profile of the wetness at inlet to the last stage of the turbine. The movement and deposition of the water droplets are tracked in a Lagrangian frame. The variations of the fog and coarse water deposition rates are obtained in both the spanwise and axial-chordwise directions.

Deposition

10.1177/0957650913511800

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Citations (15)

Thermodynamic analysis of the rotary tooth compressor

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy (2002)

Xueyuan Peng Ziwen Xing L Li Peng Shu

The Roots blower has no built-in compression and therefore is not efficient when it discharges gases at pressures substantially higher than at suction. The rotary tooth compressor, which includes built-in compression, has been proposed as a more efficient alternative. This paper describes an analytical study of the rotary tooth compressor. A mathematical model has been constructed to simulate the thermodynamic processes within it and hence predict its performance. The model allows for gas leakage as well as the main gas flow into and out of the working chamber. The estimated performance has been compared with experimental test results. The mathematical model was thereby validated. Further analyses were then carried out, using the validated mathematical model, to determine the magnitude of power and capacity losses in the machine. It is shown that the rotary tooth compressor is more efficient than the Roots blower at pressure ratios greater than about 1.4. Loss in capacity is most affected by gas leakage, and the main cause of loss in adiabatic efficiency is the power loss associated with high gas velocities during discharge.

Leakage (economics)

Volumetric efficiency

Axial Compressor

10.1243/09576500260251165

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Citations (21)

Research on oil-free hermetic refrigeration scroll compressor

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy (2007)

Li Wang Yuanyang Zhao L Li Gaoxuan Bu Peng Shu

A prototype of the oil-free hermetic scroll compressor for the application of the refrigeration system of the aviation devices was constructed. The performance of this prototype oil-free scroll compressor was simulated using a thermodynamic model, and was measured. And it was concluded that the prototype oil-free scroll compressor is useful for the refrigeration system of the aviation devices. The simulated results were consistent with the measured ones within less than 10 per cent of the mean deviation. When the evaporating and condensing temperatures were 5 and 55°C, respectively, the volumetric efficiency, discharge temperature, and coefficient of performance were 0.61, 135°C, and 1.45, respectively. The prototype oil-free scroll compressor had been operating reliably for more than 200 h under 85.7 per cent duty cycle and 20 h for 100 per cent duty cycle.

Scroll compressor

Coefficient of performance

Duty cycle

10.1243/09576509jpe363

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Citations (10)