Gas compressor

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

Axial-Flow Turbines

Abstract: This chapter focuses on axial-flow turbines that are the most widely employed turbines using a compressible fluid Axial-flow turbines power most of the gas turbine units and they are more efficient than radial-inflow turbines in most operational ranges They are also used in steam turbine design; however, there are some significant differences between the axial-flow turbine design for a gas turbine and the design for a steam turbine Axial-flow turbines are now designed with a high work factor to obtain lower fuel consumption and reduce the noise from the turbine Lower fuel consumption and lower noise requires the design of higher by-pass ratio engines, and a high by-pass ratio engine in turn requires various turbine stages to drive the high-flow, low-speed fan The flow in axial-flow turbines enters and leaves in the axial direction There are two types of axial turbines: impulse type and reaction type Most axial flow turbines consist of more than one stage The front stages are usually impulse (zero reaction) and the later stages have about 50% reaction The impulse stages produce about twice the output of a comparable 50% reaction stage, while the efficiency of an impulse stage is less than that of a 50% reaction stage The high temperatures that are available in the turbine section have resulted from the improvements of the metallurgy of the blades in the turbines Development of directionally solidified blades as well as the new single-crystal blades, with the new coating cooling schemes, is responsible for the increase in firing temperatures The high pressure ratio in the compressor also causes the cooling air used in the first stages of the turbine to become hot

Cryogenic refrigerator with single stage compressor

Abstract: A closed cycle refrigerating system for cryogenic temperatures using a single stage compressor (12) with a refrigerant comprising a gas mixture. The refrigerating system includes a heat exchanger (28) having a throttling orifice (34) which is arranged to provide refrigeration, and a single stage oil lubricated compressor (12) for compressing the refrigerant. The compressor is typically of the rolling piston type. The refrigerant is a mixture of at least one cryogenic gas having a normal boiling point below 120 degrees K and at least two other gases having normal boiling point temperatures below 300 degrees K different from each other and from said one gas. There is also included means (18) for cooling the compressed refrigerant and for circulating the cooled refrigerant to the heat exchanger and its throttling orifice and then back to the compressor. The system does not require any cascaded heat exchangers or intermediate phase separators.

System and method for operating industrial gas turbine apparatus and gas turbine electric power plants preferably with a digital computer control system

Abstract: A gas turbine power plant is provided with an industrial gas turbine which drives a rotating brushless exciter generator coupled to a power system through a breaker. One or more of the turbine-generator plants are operated by a hybrid digital computer control system during sequenced startup, synchronizing, load, and shutdown operations. The program system for the computer and external analog circuitry operate in a multiple gas turbine control loop arrangement. Logic macro instructions are employed in programming the computer for logic operations of the control system.

Air conditioner for vehicle

Abstract: PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of preventing an occupant from feeling noise. SOLUTION: This air conditioner for the vehicle is provided with a compressor 20 for compressing refrigerant, a condenser 18 for condensing refrigerant, a condenser fan 19 for blowing cooling air to the condenser 18, an evaporator 22 for cooling air for air conditioning by evaporating refrigerant, an evaporator outlet side air target temperature setting part 43 for setting target temperature of air on an evaporator outlet side to predetermined temperature exceeding the lowest temperature set to prevent freezing of the evaporator in accordance with outside air temperature and target blow-out temperature, a compressor off part 41 for turning the compressor 20 off when temperature of air on the evaporator outlet side is below the predetermined temperature, and a condenser fan speed control part 42 for switching speed of the condenser fan from low speed to high speed when pressure of refrigerant on a discharge side of the compressor is above predetermined pressure. The evaporator outlet side air target temperature setting part sets the predetermined temperature to the lowest temperature when vehicle speed is below predetermined vehicle speed. COPYRIGHT: (C)2006,JPO&NCIPI

The Free Piston Power Pack: Sustainable Power for Hybrid Electric Vehicles

Abstract: The Free Piston Power Pack (FP3) represents a new concept in the design of free piston engines The FP3 is a free piston engine with an integral generator for electrical power output Its novel features are an integral compressor and a passive intake valve located in the head of the piston These improvements eliminate undesirable problems that affect conventional free piston engine designs, such as piston ring wear and the need for an external compressor, and allow a significant increase in power density The FP3 is designed to meet the highest levels of fuel efficiency and exhaust emissions performance in a compact size for use in hybrid electric vehicles (HEVs) This paper describes the design of the FP3 and gives details of the operation and construction of a prototype