This paper covers the development of stage-by-stage and parallel flow path compressor modeling approaches for a Variable Cycle Engine. The stage-by-stage compressor modeling approach is an extension of a technique for lumped volume dynamics and performance characteristic modeling. It was developed to improve the accuracy of axial compressor dynamics over lumped volume dynamics modeling. The sta...

This study, which developed a laboratory prototype of a hermetic C02 compressor, was motivated by three primary factors. First, the C02 cycle is important because of global concern about ozone depletion and global wanning. Second, the leak tightness, efficiency, size and weight of hermetic motor-driven compressors make them preferable to open-type compressors for conventional residentiallcommer...

Computer modelling and numerical FEM analysis of buried preloaded (prestressed) piping of a compressor station is shortly discussed in the present paper. The aim of the preloading is to reduce the stress intensity at the critical point of the piping. The necessary preloading force was computed as a non-linear function of the effects of bearing and friction at the pipe/soil interface. The real m...

The air separation plays an extremely important role in the development of metallurgical industry. And the air compressor which provides not only the required pressure air for the cooling equipment and refrigeration plant but also the raw material required for the separation plant is a key device in the air separation plant. Utilization of the air compressor is extremely extensive in many signi...

Abstract The design of critical facilities needs a targeted computation the expected ground motion levels. Trans Adriatic Pipeline (TAP) is pipeline that transports natural gas from Greek-Turkish border, through Greece and Albania, to Italy. We present here probabilistic seismic hazard analysis (PSHA) we performed for this facility, deaggregation results, aiming identify dominant sources select...

Refrigerant compressors can be a primary noise source in residential air conditioning and heat pump systems. When evaluating the contribution of a compressor to the total noise, it is necessary to consider how the compressor couples to the condensing unit. Compressors typically couple to the condensing unit via three different types of noise paths. First, the compressor couples structurally to ...

Accumulation and subsequent compression of carbon dioxide that is removed from space cabin are two important processes involved in a closed-loop air revitalization scheme of the International Space Station (ISS). The 4-Bed Molecular Sieve (4BMS) of ISS currently operates in an open loop mode without a compressor. This paper reports the integrated 4BMS and liquid-cooled TSAC testing conducted du...

Centrifugal compressors produce high pressure ratio and rotate at speeds. So, a tiny unbalance can produce severe vibration. In this paper, effects of impeller gap on rotor vibration in a high speed centrifugal compressor is investigated. For this purpose, a numerical and experimental analysis are carried out. The moving reference frame method in FLUENT software is used for modeling of geometri...

Small rotor clearances are today a vital prerequisite for an efficient screw compressor. The clearances are responsible for compressor leakages, small clearance will minimise them and thereby increase both, the volumetric and adiabatic efficiency. A continuous improvement in the rotor manufacturing equipment has been achieved during the recent years and tight production tolerances may now be ap...