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RISA Novel Bulk-Flow Model for Pocket Damper Seals
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, a novel bulk-flow model for pocket damper seals (PDS) is introduced. The model is based on two control volumes (CVs) for each circumferential pocket of the seal. The continuity, circumferential momentum, and ...
A Rotordynamic, Thermal, and Thrust Load Performance Gas Bearing Test Rig and Test Results for Tilting Pad Journal Bearings and Spiral Groove Thrust Bearings
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A high-speed gas bearing test rig was developed to characterize rotordynamic, thermal, and thrust load performance of gas bearings being developed for an oil-free turboexpander. The radial bearings (RBs) tested in this ...
Rotordynamic Computational and Experimental Characterization of a Convergent Honeycomb Seal Tested With Negative Preswirl, High Pressure With Static Eccentricity and Angular Misalignment
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Hole-pattern or honeycomb seals have been commonly used for many years in the Oil & Gas industry as damper seals for turbomachinery. The main motivation has been to introduce additional damping to improve the shaft ...
Labyrinth Seal and Pocket Damper Seal High Pressure Rotordynamic Test Data
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The current centrifugal compressor design for the oil & gas market is more and more challenging, and the presence of many competitors is pushing technology towards both a casing size reduction and a rotational speed ...
An Improved Catcher Bearing Model and an Explanation of the Forward Whirl/Whip Phenomenon Observed in Active Magnetic Bearing Transient Drop Experiments
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Though many approaches have been proposed in the literature to model the reaction forces in a catcher bearing (CB), there are still phenomena observed in experimental tests that cannot be explained by existing models. The ...
Stratified Two-Phase Flow in Annular Seals
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The present study concerns the leakage predictions in pressure annular centered seals operating in a two-phase (gas–liquid) smooth stratified flow pattern. In such systems, the liquid experiences centrifugal forces typically ...
Experiments on a Large Flexure Pivot Journal Bearing: Summary of Test Results and Comparison With Predictions
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Flexure pivot® journal bearings (FPJBs) have typically been used in small high-speed applications such as integrally geared compressors and multistage high-speed compressors, where the temperature management and the ...
Analysis of the Rotordynamic Response of a Centrifugal Compressor Subject to Aerodynamic Loads Due to Rotating Stall
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In the current industrial research on centrifugal compressors, manufacturers are showing increasing interest in the extension of the minimum stable flow limit in order to improve the operability of each unit. The aerodynamic ...
A Systematic Approach to Estimate the Impact of the Aerodynamic Force Induced by Rotating Stall in a Vaneless Diffuser on the Rotordynamic Behavior of Centrifugal Compressors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: One of the main challenges of the present industrial research on centrifugal compressors is the need for extending the left margin of the operating range of the machines. As a result, interest is being paid to accurately ...
Experimental Results and Computational Fluid Dynamics Simulations of Labyrinth and Pocket Damper Seals for Wet Gas Compression
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The most recent development in centrifugal compressor technology is toward wet gas operating conditions. This means the centrifugal compressor has to manage a liquid phase which is varying between 0% and 3% liquid volume ...