Papers by Keyword: Compressor

Abstract: Thermophysical model of liquid-steam stream compressor, results of analysis of experimental researches of boiling up streams of liquid in the broadening ducting and running part of liquid-steam stream compressor, description of forming of three critical modes of flow and structural inversion of stream are presented in this article. The mathematical model of working process which allows to determine parameters and characteristics of liquid-steam stream compressor is presented.

Abstract: Compressor is the heart of refrigeration system, and the most valuable part in a refrigerator from the perspective of recycling. So the recycling progress (remanufacturing or recycling) is critical for taking full advantage of the compressors that run out of use. This paper introduces a method to decide whether to remanufacture or to recycle a compressor based on Naïve Bayes.

Abstract: This paper is mainly on the research of squeeze casting production automobile air conditioner front cover FS170C, due to the development and optimization of the part in the production process, design and manufacture of low cost mould, the rules of structure and properties of castings is lack of corresponding research, seriously affected the development and market competition ability of the air conditioning compressor front cover. In order to solve the above problems, and to provide reference data and process scheme is necessary, this study to optimize the design of squeeze casting technology of the front cover of the air conditioner, finalized a most reasonable extrusion casting scheme, namely the gating system is more suitable and exhaust system design, and the squeeze casting process parameters, in this scheme next, carries on the mold design, production of squeeze casting of high quality.

Abstract: The compression of the flue gas is one of the most critical processes of CO2 recycling in oxy-fuel combustion technology. With a 300 MW Oxy-fuel pulverized coal fired boiler taken as an example of study, the selection of compressors of its flue gas compressing system is analyzed by the thermodynamic calculation. In this paper, two centrifugal compressors with the same specification are in parallel running as Scheme 1 of selection, while an axial compressor and a piston compressor are in series operation as Scheme 2 of selection. It shows that the Scheme 2 has the advantage of the energy consumption and water separation of the flue gas in inter-cooler comparing with Scheme1.

Abstract: Several N-3 compressors are proposed against the limitations of conventional compressors on power optimization. Larger module based N-3 compressors provide more space for EDA tools to make the full use of various strategies and low-power cells. The number of modules and logical boundary can be reduced when the compression tree is constructed by N-3 compressors. The partial products of the Booth multipliers 48X48 and 64X64 are compressed by different compressors. The results show that, under same constraint conditions, the operating speed of compression tree constructed by N-3 compressors is ensured and a significant reduction of power is obtained.

Abstract: The design and characteristic analysis of the single-stage centrifugal compressor were performed to meet the requirements of the integral performance of a certain solid propellant air turbo rocket (SPATR). Based on the limitation of the geometry and aerodynamic demands, the impeller and diffuser were designed and optimized by considering the disc friction loss and the flow quality. A theoretical approach was applied to evaluate feasibility and primary aerodynamic performance of the compressor. Focused on the operation performance of the compressor, the detailed flow structure in the compressor was investigated by using numerical simulation. The results show that the total pressure ratio and isentropic efficiency of the compressor in design point are 3.5 and 0.78 respectively, which meets the design demands. The compressor has excellent aerodynamic characteristics during the starting procedure or under the partial loading condition. The position of flow separation and the reason of flow loss are analyzed to conduct further optimization.

Abstract: By applying the seamless data interface between SolidWorks and ADAMS, the model of the internal combustion compressor was imported. The internal combustion compressor virtual prototype model was established, the kinematics and dynamics analysis were completed, and the dynamic load on crankshaft was given. After we use finite element analysis software ANSYS, the modal analysis of crankshaft were accomplished, the modes of vibration and response frequency in the first five orders were obtained. The mixed body dynamics model was established, and the crankshaft force curves under the rigid body and flexible body morphology were obtained.

Abstract: This document focuses on motors and frequency conversion equipments of stations of West-to-East Gas Pipeline, and introduces the present main cooling ways. Against water consumption, power consumption, and other economical index, analyze the selection process of cooling scheme in engineering design. Compare with the cost, workload of operation and maintenance of water cooling, air cooling and motor cooling. The result shows that water cooling is practicable in West-to-East Gas Pipeline and has validated in the established engineering. The method of scheme comparison proposed by this paper provides a reference for subsequent design.With the development of electronics technology, medium voltage high power frequency conversion speed regulation technology is increasingly mature. The technology that frequency conversion motor drives compressor unit has been gradually used in the long distance pipeline pressure field of oil and gas under the condition of reliable power supply, to replace the traditional gas turbine, and becomes the first choice of the pressurization equipment of the long distance pipeline, because of advantages of high technology, high efficiency, energy conservation and environment protection, economic benefits and so on^[1-3].Stations of West-to-East Gas Pipeline are usually electrical driven. When the compressors operate, motors and frequency converters will produce large amounts of heat, which affects running state and equipment life. So choosing the economic and technological cooling water scheme is important for stations and the whole network to operate safely and stably^[4-6].

Abstract: Research was made in order to design a good reciprocating oilless air compressor. Grease lubrication bearings are used in connecting rod larger heads, smaller heads and main shaft necks, its structures are designed, so the oilless lubrications are achieved over there. Self-lubricating materials are used to make piston pings and guiding pings, the lap-joint structure is used in piston pings, so the problems of oilless lubrication and seal between piston component and cylinders can be solved. The structure of unloading slots for guiding pings, smaller radius-length ratios and lower pressure ratios can make piston pings and guiding pings run long time. Series products of oilless air compressors which are made as above have gone into mass production.

Abstract: The simulations of a low-speed axial compressor rotor with two tip clearance sizes, 0.5% chord and 1.5% chord, were performed in the study. Overall performance and detailed flow fields at near stall condition are analyzed. The results show that the rotor stall occurs at higher mass flow condition with large tip clearance. For the small tip clearance the tip leakage vortex and the corner vortex both contribute significantly to the rotor stall, and the interaction between the vortices promotes the stall generation. While for the large tip clearance the tip leakage vortex plays a primary role, and the vortices interaction is ignorable.