Gas compressor

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

Turbofan engine assembly and method of assembling same

Abstract: A turbofan engine assembly (10) including a core gas turbine engine (13) including a high-pressure compressor (14), a combustor (16), and a high-pressure turbine (18), a low-pressure turbine (20) coupled to the core gas turbine engine, a counter-rotating booster compressor (22) including a first rotor section (50) configured to rotate in a first direction and a second rotor section (60) configured to rotate in an opposite second direction, and a gearbox (100) including an input (110) and an output (111, 112), the gearbox output coupled to at least one of the first and second rotor sections, the gearbox input coupled to the low-pressure turbine.

Performance Characteristics of an Operating Supercritical CO2 Brayton Cycle

Abstract: Supercritical CO2 (S-CO2) power cycles offer the potential for better overall plant economics due to their high power conversion efficiency over a moderate range of heat source temperatures, compact size, and potential use of standard materials in construction [1,2,3,4]. Sandia National Labs (Albuquerque, NM, US) and the US Department of Energy (DOE-NE) are in the process of constructing and operating a megawatt-scale supercritical CO2 split-flow recompression Brayton cycle with contractor Barber-Nichols Inc. [5] (Arvada, CO, US). This facility can be counted among the first and only S-CO2 power producing Brayton cycles anywhere in the world.The Sandia-DOE test-loop has recently concluded a phase of construction that has substantially upgraded the facility by installing additional heaters, a second recuperating printed circuit heat exchanger (PCHE), more waste heat removal capability, higher capacity load banks, higher temperature piping, and more capable scavenging pumps to reduce windage within the turbomachinery. With these additions, the loop has greatly increased its potential for electrical power generation — according to models, as much as 80 kWe per generator depending on loop configuration — and its ability to reach higher temperatures.To date, the loop has been primarily operated as a simple recuperated Brayton cycle, meaning a single turbine, single compressor, and undivided flow paths. In this configuration, the test facility has begun to realize its upgraded capacity by achieving new records in turbine inlet temperature (650°F/615K), shaft speed (52,000 rpm), pressure ratio (1.65), flow rate (2.7 kg/s), and electrical power generated (20kWe). Operation at higher speeds, flow rates, pressures and temperatures has allowed a more revealing look at the performance of essential power cycle components in a supercritical CO2 working fluid, including recuperation and waste heat rejection heat exchangers (PCHEs), turbines and compressors, bearings and seals, as well as auxiliary equipment. In this report, performance of these components to date will be detailed, including a discussion of expected operational limits as higher speeds and temperatures are approached.Copyright © 2012 by ASME

Multifunction power system for an aircraft

Abstract: The multifunction power system is a combination auxiliary power unit, environmental control system, engine start system, and emergency power system for an aircraft. The system is essentially a four-wheel auxiliary power unit comprising two compressors driven by one turbine by means of a common shaft and in addition a free turbine. The pressurized flow from the second compressor can be directed to parallel combustors and thereafter to the two turbines. A starter-generator and motor are coupled to the compressor drive shaft and the free turbine is used to power a generator and for engine starting. Ducts, heat exchangers, valves, etc., are so arranged as to provide the four functions by proper selection and routing of air.

Compressor stall and surge control using airflow asymmetry measurement

Abstract: A technique for controlling compressor stall and surge is disclosed. In a gas turbine engine, static pressure asymmetry is sensed at a plurality of locations along the circumference of the compressor inlet. Time rate of change of the mass flow in the compressor is also estimated using pressure measurements in the compressor. A signal processor uses these signals to modulate a compressor bleed valve responsive to the level of flow property asymmetry, the time rate of change of the annulus average flow to enhance operability of the compressor.

Method of generating energy in a power plant comprising a gas turbine, and power plant for carrying out the method

Abstract: A method of generating energy in a power plant ( 30 ) having a gas turbine ( 29 ), includes a first step a gas containing air ( 1 ) is compressed in a first compressor ( 2 ) of the gas turbine ( 29 ), a second step the compressed gas ( 3, 3 a, 3 b; 5; 7 a, 7 b ) is fed to a combustion process with the addition of fuel ( 8 ) in a combustor ( 23 ), a third step the hot flue gas ( 9 ) from the combustor ( 23 ) is expanded in an expander or a turbine ( 10 ), driving a generator ( 18 ), of the gas turbine ( 29 ) while performing work, and a fourth step a partial flow of the expanded flue gas ( 11 ) is recirculated to the inlet of the first compressor ( 2 ) and admixed with the gas containing air ( 1 ). Carbon dioxide (CO 2 ) is separated from the compressed gas ( 3, 3 a, 3 b; 5; 7 a, 7 b ) in a CO 2 separator ( 6 ) before the third step. In such a method, the overall size and energy costs are reduced by virtue of the fact that, to permit increased CO 2 concentrations in the CO 2 separator ( 6 ), not more than about 70 % of the carbon dioxide contained in the compressed gas ( 3, 3 a, 3 b; 5, 5 a, 5 b; 7 a, 7 b ) is removed from the compressed gas ( 3, 3 a, 3 b; 5, 5 a, 5 b; 7 a, 7 b ).