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The accomplished experiments are the first available in open literature showing that the fluid core rotation in the compressor side cavities plays a crucial role for the prediction of the acoustic eigenfrequencies with respect to the rotor frame of reference. Without taking into account the effect of fluid rotation, large deviations between predicted (simulated) and measured acoustic eigenfrequencies would be the result.
During the past decades studies of aeroacoustic phenomena in turbomachinery were mainly carried out by research institutions. The aerospace industry was the main driver in this field since noise issues gained more and more significance. The paper gives an overview on the research activities, presents the underlying theory, and gives new results that are relevant from a practical point of view. A new aeroacoustic excitation model is presented and its succesful application to explain two impeller failures in the oil and gas industry is illustrated.
This paper presents a new approach for generation of high-quality data on a unique full-scale high-pressure test rig, in which specific attention is paid to impeller-eye seals. The applied strategy combines results from the test rig obtained from different methods with findings from computational fluid dynamic (CFD) investigations. The publication of dimensional data offers further use of these results within the turbomachinery community.
This paper details multiple issues associated with the electrical and mechanical interaction and additionally the interaction of two ore more identical trains in parallel operation with respect to torsional oscillations during converter operation. The paper also provides a comperative overview ot the torsional design with regard to results of the individual mechanical system, without electrical/ mechanical interaction, and the results of the full coupled electrical-mechanical model.
The successful application of sychronous motors requires special design consideration to account for their speed-dependent characteristics, such as the large oscillating torque levels that occur during startup. This paper focuses on the torsional design and analysis process associated with revamping a 7000hp synchronous motor-driven compressor train with an 8000hp synchronous motor driver.
A new analysis method uses basic ideas from magnetic bearing control theory. The equations of motion are prepared in such a way that the identification of the spring and damper coefficients reduces to a linear curve fit in the frequency domain. A coherence-based filter algorithm improves the quality of the results, which are presented in numerical and graphical form. The method is applied to determine the four coefficients for the centered position as well as the full matrices for arbitary rotor position.
The overall design of high-pressure centrifugal compressors is largely influenced by rotordynamic aspects. Rotor instability may restrict operating speed and/ or maximum discharge pressure if the destabilizing effects have not been considered accurately during the design phase. A test rig for high pressures has been designed and operated succesfully in oder to achieve dynamic labyrinth seal coefficients through simulation of original conditions in every aspect.
This paper explains the design and testing of a high-pressure centrifugal compressor. It also covers commissioning and field experience. Important issues for high-pressure compressors are highlighted in the paper in general terms and for a specific design. Included are the mechanical impeller design, seal clearance control, and rotor stability.