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Gas compressor

About: Gas compressor is a research topic. Over the lifetime, 91817 publications have been published within this topic receiving 552209 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, two commonly used types of continuous flow compressors, the axial compressor and the radial or centrifugal compressor, are discussed. But, stable operation of axial and radial compressors is constrained by two aerodynamic flow instabilities: rotating stall and surge.
Abstract: Compressors are widely used for the pressurization of fluids. Applications involve air compression for use in aircraft engines and pressurization and transportation of gas in the process and chemical industries. The article focuses on two commonly used types of continuous flow compressors: the axial compressor, where the gaseous fluid is processed in a direction parallel to the rotational axis, and the radial or centrifugal compressor, where the pressurized fluid leaves the compressor in a direction perpendicular to the rotational axis. In these machines, the entering fluid is pressurized by first accelerating it via the kinetic energy imparted in the rotors and then converting the kinetic energy into potential energy by decelerating the fluid in diverging channels. Toward low mass flows, stable operation of axial and radial compressors is constrained by two aerodynamic flow instabilities: rotating stall and surge. The article gives an overview of the current state of modeling and control of these instabilities.

100 citations

Patent
20 Nov 1987
TL;DR: In this article, a turbofan gas turbine engine comprising in axial flow series a fan, a booster compressor and a core engine is provided with a diffuser, which is positioned axially between the booster and the compressor of the core engine.
Abstract: A turbofan gas turbine engine comprising in axial flow series a fan, a booster compressor and a core engine is provided with a diffuser The diffuser is positioned axially between the booster compressor and the compressor of the core engine to efficiently diffuse the air from the fan to the compressor of the core engine The diffuser comprises a plurality of circumferentially arranged geodesic pipe diffusers, the pipe diffusers extend axially and radially and the outlets of the pipe diffusers are displaced circumferentially by an angle of between 20° and 60° with respect to the inlets of the pipe diffusers The geodesic pipe diffusers allows the airflow between the fan and the core engine to be diffused adequately without compromising the efficiency of the core engine, or the high mass flow rate of the fan and also minimizes the length, weight and drag of the gas turbine engine

100 citations

Journal ArticleDOI
TL;DR: In this paper, a thermodynamic evaluation and optimisation of different two-stage transcritical carbon dioxide cycles is presented. But the authors focus on the effect of internal heat transfer between different streams of refrigerants.
Abstract: The aim of this paper is the thermodynamic evaluation and optimisation of different two-stage transcritical carbon dioxide cycles. Five different cycles are studied: basic single-stage cycle, single-throttling with two-stage compression cycle, split cycle, phase separation cycle and single-stage cycle coupled with a gas cooling circuit. Each basic cycle is analysed for the effect of internal heat transfer between different streams of refrigerants. In the case of two-stage compression, intermediate cooling between the compressor stages is present. An analysis on the Plank cycle for intermediate pressure higher than critical one is performed. Each cycle is optimised with regards to energy performance, calculating the optimal values of both the upper and the intermediate pressures. In the case of split cycle, the ratio of the mass flow rate in the main stream to the one in the auxiliary stream is also optimised.

100 citations

Patent
15 Jul 2003
TL;DR: In this paper, the field magnetic circuit of the starter/generator is mounted in the bore of at least one disk of the compressor and surrounding the secondary magnetic circuit which is secured to a cylindrical shroud provided on the support structure for the bearing of the turbine.
Abstract: The invention relates to a turbomachine of axis X including a compressor and an integrated starter/generator. The field magnetic circuit of the starter/generator is mounted in the bore of at least one disk of the compressor and surrounds the secondary magnetic circuit which is secured to a cylindrical shroud provided on the support structure for the bearing of the compressor. The invention applies in particular to single-shaft or multi-shaft turbomachines.

100 citations

Patent
07 Apr 1995
TL;DR: In this article, a variable geometry inlet nozzle is used to adjust the air flow rate therethrough without significant throttling, and the power turbine extracts the expansion energy from the bleed air while cooling it.
Abstract: An environmental control system has an air cycle machine that includes a compressor (38), a cooling turbine (34), a motor/generator (36), and a power turbine (40) all mounted on a single shaft (32). The power turbine receives bleed air from the aircraft's engine (12) and has a variable geometry inlet nozzle (42) that adjusts the air flow rate therethrough without significant throttling. Downstream of the nozzle the power turbine extracts the expansion energy from the bleed air while cooling it. This is used to drive the other components of the air cycle machine, and in particular the motor/generator which generates electricity.

100 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023895
20222,148
20211,236
20203,282
20194,240
20184,449