Browsing by Author "Cave, Michael"

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    CST14 - Design and Implementation of Swirl Brakes for Enhanced Rotordynamic Stability in an Off?shore Centrifugal Compressor
    (Turbomachinery Laboratory, [2019]) Cave, Michael; Moulton, David; Eldridge, Thom; Wilkes, Jason; Clarke, Chris; Venkataraman, Balaji; Moore, Jeff
    Rotordynamic stability of gas compressors at high speeds and operating pressures is a significant technical challenge. Dynamic instability must be avoided for the sake of safe, reliable and continuous operation of turbomachinery. During the last few decades, the industry has successfully used swirl-brakes in a Teeth-on-Stator configuration for many applications. This case study presents the design, testing and successful implementation of swirl-brakes for a Teeth-on-Rotor configuration to improve rotordynamic stability.
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    OPERATION OF CENTRIFUGAL COMPRESSORS IN CHOKE CONDITIONS
    (Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2013) Kurz, Rainer; Fowler, Edward; Marechale, Russell; Ji, Min; Cave, Michael
    Centrifugal compressors are at times required to operate in or near the choke region. Various limits of the degree of allowable operation in choke have been established. Based on test data and numerical data, the behavior of centrifugal compressors in the choke region is studied. Changes in aerodynamic performance, thrust load, volute behavior and radial loading are considered. The issue of excitation of impeller vanes is addressed. Particular consideration is given to multistage machines, as well as dual compartment machines, in particular regarding the effects of impeller mismatch during operating conditions at flows significantly higher than the design flow. Limitations in the overload operating range of a compressor not only impact the operational flexibility , but also can require more complicated control systems. The paper addresses aerodynamic, structural as well as rotordynamic issues related to the operation in choke.