Review Of Aerodynamically Induced Forces Acting On Centrifugal Compressors, And Resulting Vibration Characteristics Of Rotors

TutorialThere are several sources of non-synchronous forced vibration of centrifugal compressor rotors. Many of them are aerodynamic phenomena, created within the gas path of the compressor. Phenomena such as impeller stall, diffuser stall (with and without vanes), and flow instabilities caused by impeller to diffuser misalignment, are all characteristic flow disturbances that can cause forced vibration. In fact, often the only indications of these phenomena are found in the resulting rotor vibration signals. Several phenomena that can cause non-synchronous vibration are reviewed, and for each one, background information, as well as detailed descriptions of the flow field, or other source of the excitation, is provided. This includes the use of CFD analytical results to describe the flow where applicable. The review also includes, when available, dynamic pressure transducer test data that can be used to verify the presence of the phenomena, and rotor vibration data indicating the presence of such phenomena. This includes test data of actual machines, indicating characteristics such as frequency and amplitude

Buying / Selling Serial #1

TutorialThe machinery utilized in the Oil and Gas Industry, (Upstream, Midstream and Downstream) is undergoing very significant changes. In the past years, the use of new designs or prototype machinery was strongly discouraged. Changes were modest and taken slowly. However, rapidly escalating changes in operating environments and requirements are requiring users and manufacturers to pursue "Step Outs" or, as defined in this paper, Serial #1 machinery. The authors detail some of the design challenges being encountered by users and manufacturers. A number of specific design challenges that have been encountered in the centrifugal compressor arena are described. Considerable engineering and design detail for these specific challenges are discussed. It is hoped that this discussion will provide the readers with some level of understanding of both the challenges they are facing and the manner in which they may address them while managing the risk inherent in these designs

Buying / Selling Serial #1

TutorialN/AThe machinery utilized in the Oil and Gas Industry, (Upstream, Midstream and Downstream) is undergoing very significant changes. In the past years, the use of new designs or prototype machinery was strongly discouraged. Changes were modest and taken slowly. However, rapidly escalating changes in operating environments and requirements are requiring users and manufacturers to pursue "Step Outs" or, as defined in this paper, Serial #1 machinery. The authors detail some of the design challenges being encountered by users and manufacturers. A number of specific design challenges that have been encountered in the centrifugal compressor arena are described. Considerable engineering and design detail for these specific challenges are discussed. It is hoped that this discussion will provide the readers with some level of understanding of both the challenges they are facing and the manner in which they may address them while managing the risk inherent in these designs

A Review of Aerodynamically Induced Forces Acting on Centrifugal Compressors, and Resulting Vibration Characteristics of Rotors

TutorialThere are several sources of non-synchronous forced vibration of centrifugal compressor rotors. Many of them are aerodynamic phenomena, created within the gas path of the compressor. Phenomena such as impeller stall, diffuser stall (with and without vanes), and flow instabilities caused by impeller to diffuser misalignment, are all characteristic flow disturbances that can cause forced vibration. In fact, often the only indications of these phenomena are found in the resulting rotor vibration signals. Several phenomena that can cause non-synchronous vibration are reviewed, and for each one, background information, as well as detailed descriptions of the flow field, or other source of the excitation, is provided. This includes the use of CFD analytical results to describe the flow where applicable. The review also includes, when available, dynamic pressure transducer test data that can be used to verify the presence of the phenomena, and rotor vibration data indicating the presence of such phenomena. This includes test data of actual machines, indicating characteristics such as frequency and amplitude

Recent Experiences In Full Load Full Pressure Shop Testing Of A High Pressure Gas Injection Centrifugal Compressor.

LecturePg. 3-1

Centrifugal Compressor Evolution

Lecturepg. 59-70This paper addresses the advancements that have been made during the past 50 years in the design, analysis, and manufacturing methods for centrifugal compressors. The paper provides a historical perspective on these disciplines, citing how they and other technological innovations have contributed to significant improvements in the aerodynamic and mechanical performance of modern turbomachines