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"Compressors"
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Radial flow turbocompressors : design, analysis, and applications
\"An introduction to the theory and engineering practice that underpins the component design and analysis of radial flow turbocompressors. Drawing upon an extensive theoretical background and years of practical experience the authors provide: Descriptions of applications, concepts, component design, analysis tools, performance maps, flow stability, and structural integrity, with numerous illustrative examples. Wide coverage of all types of radial compressor over a range of applications unified by the consistent use of dimensional analysis. The methods needed to analyse the performance, flow and mechanical integrity that underpin the design of efficient centrifugal compressors with good flow range and stability. Explanation of the design of all radial compressor components, including inlet guide vanes, impellers, diffusers, volutes, return channels, de-swirl vanes and side-streams. Suitable as a reference for advanced students of turbomachinery, and a perfect tool for practising mechanical and aerospace engineers already within the field as well as those just entering it\"-- Provided by publisher.
Book
AIChE Equipment Testing Procedure - Centrifugal Compressors - A Guide to Performance Evaluation and Site Testing
The newest addition to AIChE's long-running Equipment Testing Procedure series, this book provides chemical engineers, plant managers, and other professionals with helpful advice to assess and measure the performance of a key component in a number of chemical process operations. From petrochemical refining and natural gas production to air separation plants, efficient, safe, and environmentally-sound operations depend on reliable performance by centrifugal compressors.The book presents a step-by-step approach to preparing for, planning, executing, and analyzing tests of centrifugal compressors, with an emphasis on methods that can be conducted on-site - and with an acknowledgement of the strengths and limitations of these methods. The book opens with an extensive and detailed section offering definitions of relevant terms explained not only in words, but also with the equations used to determine their values.
eBook
Design and testing of the fuel cell twin-screw air compressor
The oil-free dry air compressor plays a crucial role in the fuel cell system, particularly in commercial buses where twin-screw air compressors have proven effective. A novel rotor profile of the twin-screw dry air compressors has been developed, which simplifies the profile curve and yields excellent performance results with a volume flow of 11.99 m³/min and corrected specific power of 3.54 kW/(m³/min).
Journal Article
Load simulation and experimentation of two-stage reciprocating air compressor drive system
In this paper, an electromechanical coupling method is proposed to simulate the torque load of a reciprocating compressor drive system, and the feasibility of the method is verified by carrying a reverse torque test platform. The load torque of the motor drive shaft under three different exhaust pressures of 0.6 MPa, 1 MPa, and 1.8 MPa were simulated and tested, respectively, and the results show that the load fluctuation of the 1 MPa condition has the least influence, which is the optimal condition for this compressor.
Journal Article
Performance study of oil-injection hermetic CO.sub.2 scroll compressor for automotive air conditioning system
An oil-injection CO.sub.2 scroll compressor prototype and relative simulation model are developed for automotive Air Conditioning. The effects of oil to refrigerant mass ratio on the compressor performance are studied theoretically and experimentally. The results show that oil-injection is an effective way to improve the volumetric and indicated efficiencies, and reduce discharge temperature. The optimal oil-injection quantity varies at different conditions, and it decreases from 7.9% to 6.3% at fixed discharge pressure 10MPa when the suction pressure increases from 4.5MPa to 5MPa. Similar linear relationships are found and the different slopes of the line are exhibited at fixed suction and discharge pressure separately. Numerical results show that oil-injection has little influence on pressure in working chamber during suction and discharge process, but it can slow up the rising of pressure in compression process and reduce the salient of pressure at the end of compression process.
Journal Article
Simple model of liquid piston compressor
The study proposes a new 0D thermodynamic model for the fast and simple evaluation of Liquid Piston compressors whose geometry and operation are determined by large number of parameters. With the proposed model, the evaluation of the parameters becomes easier, more dependencies are found and the understanding of the influences of parameter changes is deepened. Therefore, optimal designs for the mentioned machines can be created and tested experimentally. During the study, the model was validated with experimental and CFD data, and the results showed good agreement. It was found that evaluation criteria need to be defined for each set of geometric and operational parameters in order to compare the designs.
Journal Article
Bending and torsional coupling study of rolling-piston compressor valves
In this paper, a model of a rolling compressor valve with one end fixed horizontally is presented and simulated using the flow-solid coupling (FSI) method for rolling rotor type compressors. Optimisation of the diagonally cut section can effectively reduce the pressure pulsation of the compressor. The results show that the valve blade generates coupled vibrations of bending and torsion, and the slant-cut structure improves the frequency of pressure pulsations, increases the stability of the compressor valve blade, optimises the compressor structure and reduces the pressure pulsations of the compressor.
Journal Article
A Literature Review of the Positive Displacement Compressor: Current Challenges and Future Opportunities
Positive displacement compressors are essential in many engineering systems, from domestic to industrial applications. Many studies have been devoted to providing more insights into the workings and proposing solutions for performance improvements of these machines. This study aims to present a systematic review of published research on positive displacement compressors of various geometrical structures. This paper discusses the literature on compressor topics, including leakage, heat transfer, friction and lubrication, valve dynamics, port characteristics, and capacity control strategies. Moreover, the current status of the application of machine learning methods in positive displacement compressors is also discussed. The challenges and opportunities for future work are presented at the end of the paper.
Journal Article
Fast resonant frequency tracking strategy of linear oscillatory motor based on gradient descent method
Recently, scholars have conducted many studies on the linear oscillatory motor, which is the core driver of linear compressors due to the LOM’s simple mechanical structure and high efficiency of energy conversion. According to its special frequency system characteristics, the compressor system can reach maximum efficiency when the motor works at the system’s resonant frequency. In this paper, to achieve resonant frequency tracking and ensure a quick response speed, a gradient descent method with discretizing the displacement and speed of the motor is raised. The simulation results verify the rapidity and effectiveness of the proposed method.
Journal Article
Towards Non-Mechanical Hybrid Hydrogen Compression for Decentralized Hydrogen Facilities
The cost of the hydrogen value chain needs to be reduced to allow the widespread development of hydrogen applications. Mechanical compressors, widely used for compressing hydrogen to date, account for more than 50% of the CAPEX (capital expenditure) in a hydrogen refueling station. Moreover, mechanical compressors have several disadvantages, such as the presence of many moving parts, hydrogen embrittlement, and high consumption of energy. Non-mechanical hydrogen compressors have proven to be a valid alternative to mechanical compressors. Among these, electrochemical compressors allow isothermal, and therefore highly efficient, compression of hydrogen. On the other hand, adsorption-desorption compressors allow hydrogen to be compressed through cooling/heating cycles using highly microporous materials as hydrogen adsorbents. A non-mechanical hybrid hydrogen compressor, consisting of a first electrochemical stage followed by a second stage driven by adsorption-desorption of hydrogen on activated carbons, allows hydrogen to be produced at 70 MPa, a value currently required for the development of hydrogen automotive applications. This system has several advantages over mechanical compressors, such as the absence of moving parts and high compactness. Its use in decentralized hydrogen facilities, such as hydrogen refueling stations, can be considered.
Journal Article