Results of a high-speed 10-stage axial-flow compressor test involving overall compressor and individual stage performance while stalling and operating in quasi-steady rotating stall are described. Test procedures and data acquisition methods used to obtain the dynamic stalling and quasi-steady in-stall data are explained. Unstalled and in-stall time-averaged data obtained from the compressor op...

1. Abstract In this paper, we consider the optimal design of a straight pipeline system. Suppose a gas pipeline is to be designed to transport a specified flowrate from the entry point to the gas demand point. Physical and contractual requirements at supply and delivery nodes are known as well as the costs to buy and lay a pipeline or build a compressor station. In order to minimize the overall...

The paper describes the design concept of a small, oilfree, reciprocating high pressure compressor which was particularly developed for NGV-applications (NGV = Natural Gas for Vehicles). It is field proven in several thousand installations in various parts of the world. The compressor head is also used in a small hermetically sealed compression unit for technical gases like N2, Air, Ar, He, H2,...

To control the temperature of electric motor, suction gas is introduced flowing through motor in hermetic scroll compressors. For high-speed compressors, this flow resistance high, which results decreasing efficiency. In paper, spiral channels were designed inside rotor to decrease and increase refrigerant rate compressor. Simulation was carried out. Two structure straight intake brought into s...

With the aim of developing a method for reducing energy consumption of room air conditioners, we address a higher-efficiency design of the rotary compressor currently most used worldwide. We focused on a new rotary compressor equipped with a mechanism to restrict the rolling motion of the piston, and performed a dynamics analysis. The new rotary compressor has a small pillar at the tip of the v...

There are different technologies to adapt the compressor’s cooling capacity to the changing requirements of the A/C and refrigerant systems when operating with screw compressors. • Distribution of the requirements to several compressors (parallel operation) • Evaporation pressure control with hot gas bypass • Internal bypass in the compressor • Reduction of the compressor displacement by a cont...

This paper refers to the noise reduction of the rolling piston type rotary compressor. In general. as the rolling piston increases its speed under the high compression ratio condition. the noise level increases steeply. We resume that this happens because a certain shock wave is produced in the comPression space. Then we could simulate the Phenomenon by the numerical analysis ( CACE method ) of...

background: 2, 4-dichlorophenoxy acetic acid (2, 4-d) is well known as inexpensive herbicides but it can give rise to undesirable pollution. the objective of this investigation was to describe a photo-chemical system for degradation of 2, 4-d. methods: a designed photolytic cell system was used in this study with a 150w or 400w uv lamp. a set of experiments was carried out at ph 1.5, 2.5, 3.5 a...