Topic
Gas compressor
About: Gas compressor is a research topic. Over the lifetime, 91817 publications have been published within this topic receiving 552209 citations.
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TL;DR: In this article, the authors defined the main features of an ORC system aimed to recover heat from a 100kWe commercial gas turbine with internal recuperator, and compared the performances of these dynamic machines with those of positive displacement expanders, such as scroll devices, obtainable from commercial HVAC compressor with minor revisions, and reciprocating ones, here newly designed.
82 citations
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TL;DR: In this paper, the experimental testing of an ORC integrate in a 2-liter turbocharged gasoline engine using ethanol as working fluid was conducted, where the main components of the cycle are a boiler, a condenser, a pump and a swash-plate expander.
82 citations
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22 Jul 2013
TL;DR: In this article, the pre-stall flow of a transonic compressor stage, NASA compressor Stage 35, is simulated with a full-annulus grid that models the 3D viscous, unsteady blade row interaction without the need for an artificial inlet distortion to induce stall.
Abstract: CFD calculations using high-performance parallel computing were conducted to simulate the pre-stall flow of a transonic compressor stage, NASA compressor Stage 35. The simulations were run with a full-annulus grid that models the 3D, viscous, unsteady blade row interaction without the need for an artificial inlet distortion to induce stall. The simulation demonstrates the development of the rotating stall from the growth of instabilities. Pressure-rise performance and pressure traces are compared with published experimental data before the study of flow evolution prior to the rotating stall. Spatial FFT analysis of the flow indicates a rotating long-length disturbance of one rotor circumference, which is followed by a spike-type breakdown. The analysis also links the long-length wave disturbance with the initiation of the spike inception. The spike instabilities occur when the trajectory of the tip clearance flow becomes perpendicular to the axial direction. When approaching stall, the passage shock changes from a single oblique shock to a dual-shock, which distorts the perpendicular trajectory of the tip clearance vortex but shows no evidence of flow separation that may contribute to stall.
81 citations
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10 Feb 2005TL;DR: In this paper, the authors describe a vapor-compression evaporation system with a plurality of vessels in series, each containing a feed having a nonvolatile component, and a mechanical compressor is coupled to the last vessel in the series of vessels and is operable to receive a vapor therefrom.
Abstract: According to one embodiment of the invention, a vapor-compression evaporation system includes a plurality of vessels in series each containing a feed having a nonvolatile component. A first set of the plurality of vessels includes vapor-compression evaporators and a second set of the plurality of vessels includes multi-effect evaporators. A mechanical compressor is coupled to the last vessel in the series of vapor-compression evaporators and is operable to receive a vapor therefrom. A turbine is coupled to, and operable to drive, the mechanical compressor. A pump is operable to deliver a cooling liquid to the mechanical compressor, and a tank is coupled to the mechanical compressor and is operable to separate liquid and vapor received from the mechanical compressor. A plurality of heat exchangers is coupled inside respective ones of the vessels, wherein the heat exchanger in the first vessel in the first set is operable to receive the vapor from the tank, and at least some of the vapor condenses therein. The heat of condensation provides the heat of evaporation to the first vessel in the first set, and at least some of the vapor inside the first vessel in the first set is delivered to the heat exchanger in the next vessel in the first set, whereby the condensing, evaporating, and delivering steps continue until the last vessel in the second set is reached.
81 citations
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25 Feb 1982TL;DR: In this paper, a refrigerant compressor whose displacement is controlled by crankcase-suction pressure differential, a control valve arrangement which is responsive to both compressor suction and discharge pressures to provide controlled communication of same with the compressor crankcase is presented.
Abstract: There is disclosed in a refrigerant compressor whose displacement is controlled by crankcase-suction pressure differential, a control valve arrangement which is responsive to both compressor suction and discharge pressures to provide controlled communication of same with the compressor crankcase so that the compressor displacement and thereby the discharge flow rate is caused to increase with increasing discharge pressure as well as with increasing suction pressure.
81 citations