Download or read book Investigation of the Performance of Labyrinth Seals for Centrifugal Compressor Applications written by Casey Palanca and published by . This book was released on 2022 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Labyrinth seals were one of the first seal configurations used in modern turbomachinery and, due to their robust qualities and relatively low-cost productions, remain one of the most widely used seal configurations today. Their primary purpose is to control internal leakage between the rotating and stationary components of rotating machinery, including the centrifugal compressor. A reduction in secondary leakage flow will always be accompanied by an increase in efficiency. However, while fulfilling the objective of restricting secondary fluid flow, labyrinth seals have been known to cause adverse stability effects on the rotor. Driving forces inside the cavities from the circumferential flow path have been known to be a potential source of destabilizing vibrations. Therefore, accurately predicting these forces is a primary interest in compressor design. These forces are characterized by stiffness and damping coefficients.The present study utilizes the growing advances in CFD to understand, model, and predict the aerodynamic and rotordynamic performance of labyrinth seals. The scope of this work progresses from a well-established steady state CFD method to a more novel transient CFD approach. The benefits and disadvantages of each method are evaluated and discussed by comparing accuracy, reliability, and computational efficiency. Each method is validated with experimental data. Additionally, the proposed transient CFD method can be used to perform a reasonably accurate prediction of the frequency-dependent rotordynamic coefficients by using a Fast Fourier Transform analysis on the monitored force response and displacement data.Lastly, the transient CFD approach is expanded upon by investigating the flow characteristics of long 18 tooth on rotor balance piston labyrinth seal modeled with abradable grooves on the stator. It was discovered that the creation of abradable grooves on the stator can cause the vortex between the labyrinth teeth to change directions (clockwise to counterclockwise). This observation is used to determine the relationship between the flow pattern and rotordynamic performance. A parametric study shows the effect of abradable groove geometries and operating flow conditions on the labyrinth seal rotordynamic coefficients.
Download or read book Investigation of Stepped Labyrinth Seal Leakage Performance written by Thomas Stanley Reed and published by . This book was released on 1993 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dry Gas Seals Handbook written by John S. Stahley and published by Pennwell Corporation. This book was released on 2005 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: &Quot;The information found in Dry Gas Seals Handbook will help you make informed decisions regarding the application, operation, and maintenance of dry gas seals. This book presents a complete guide to the technology, from the principle of gas seal operation to "lessons learned" from actual field experience."--BOOK JACKET.
Download or read book Shaft Seals for Compressors and Turbines for Gas cooled Reactor Application written by Oak Ridge National Laboratory and published by . This book was released on 1959 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Exploratory Investigation for Reducing Labyrinth Seal Leakage in High Pressure Ratio Gas Turbines written by H. L. Stocker and published by . This book was released on 1973 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: The attendant problem of labyrinth seal air leakage in current and advanced high pressure ratio gas turbines is directly related to the limitations of current gas turbine dynamic seal technology. A method of improving the efficiency of labyrinth seals which does not violate mechanical design constraints involves increasing the internal cavity turbulence of the seal. Therefore, an exploratory investigation was undertaken to conceive, design, fabricate, and test several unique labyrinth seal configurations. (Modified author abstract).
Download or read book Turbomachinery Rotordynamics written by Dara Childs and published by John Wiley & Sons. This book was released on 1993-04-16 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Imparts the theory and analysis regarding the dynamics of rotating machinery in order to design such rotating devices as turbines, jet engines, pumps and power-transmission shafts. Takes into account the forces acting upon machine structures, bearings and related components. Provides numerical techniques for analyzing and understanding rotor systems with examples of actual designs. Features an excellent treatment of numerical methods available to obtain computer solutions for authentic design problems.
Download or read book Computational Investigation of Fluid Injection Applications for the Gas Labyrinth Seal written by Sung-Young Park and published by . This book was released on 2002 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Radial Flow Turbocompressors written by Michael Casey and published by Cambridge University Press. This book was released on 2021-06-10 with total page 789 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the theory and engineering practice that underpins the component design and analysis of radial flow turbocompressors. Drawing upon an extensive theoretical background and years of practical experience, the authors provide descriptions of applications, concepts, component design, analysis tools, performance maps, flow stability, and structural integrity, with illustrative examples. Features wide coverage of all types of radial compressor over many applications unified by the consistent use of dimensional analysis. Discusses the methods needed to analyse the performance, flow, and mechanical integrity that underpin the design of efficient centrifugal compressors with good flow range and stability. Includes explanation of the design of all radial compressor components, including inlet guide vanes, impellers, diffusers, volutes, return channels, de-swirl vanes and side-streams. Suitable as a reference for advanced students of turbomachinery, and a perfect tool for practising mechanical and aerospace engineers already within the field and those just entering it.
Download or read book Three step Labyrinth Seal for High performance Turbomachines written by Robert C. Hendricks and published by . This book was released on 1987 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Process Centrifugal Compressors written by Klaus H. Lüdtke and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originating in the process compressor industry, this text primarily addresses: rotating equipment engineers, project engineers, engineering contractors, and compressor user companies in oil and gas field operations, natural gas processing, petroleum refining, petrochemical processing, industrial refrigeration, and chemical industries. It enables the reader to assess compressors and defines the constraints influencing the compressor design.
Download or read book Compression Machinery for Oil and Gas written by Klaus Brun and published by Gulf Professional Publishing. This book was released on 2018-11-30 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compression Machinery for Oil and Gas is the go-to source for all oil and gas compressors across the industry spectrum. Covering multiple topics from start to finish, this reference gives a complete guide to technology developments and their applications and implementation, including research trends. Including information on relevant standards and developments in subsea and downhole compression, this book aids engineers with a handy, single resource that will help them stay up-to-date on the compressors needed for today's oil and gas applications. - Provides an overview of the latest technology, along with a detailed discussion of engineering - Delivers on the efficiency, range and limit estimations for machines - Pulls together multiple contributors to balance content from both academics and corporate research
Download or read book IUTAM Symposium on Emerging Trends in Rotor Dynamics written by K. Gupta and published by Springer Science & Business Media. This book was released on 2011-01-06 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rotor dynamics is an important branch of dynamics that deals with behavior of rotating machines ranging from very large systems like power plant rotors, for example, a turbogenerator, to very small systems like a tiny dentist’s drill, with a variety of rotors such as pumps, compressors, steam/gas turbines, motors, turbopumps etc. as used for example in process industry, falling in between. The speeds of these rotors vary in a large range, from a few hundred RPM to more than a hundred thousand RPM. Complex systems of rotating shafts depending upon their specific requirements, are supported on different types of bearings. There are rolling element bearings, various kinds of fluid film bearings, foil and gas bearings, magnetic bearings, to name but a few. The present day rotors are much lighter, handle a large amount of energy and fluid mass, operate at much higher speeds, and therefore are most susceptible to vibration and instability problems. This have given rise to several interesting physical phenomena, some of which are fairly well understood today, while some are still the subject of continued investigation. Research in rotor dynamics started more than one hundred years ago. The progress of the research in the early years was slow. However, with the availability of larger computing power and versatile measurement technologies, research in all aspects of rotor dynamics has accelerated over the past decades. The demand from industry for light weight, high performance and reliable rotor-bearing systems is the driving force for research, and new developments in the field of rotor dynamics. The symposium proceedings contain papers on various important aspects of rotor dynamics such as, modeling, analytical, computational and experimental methods, developments in bearings, dampers, seals including magnetic bearings, rub, impact and foundation effects, turbomachine blades, active and passive vibration control strategies including control of instabilities, nonlinear and parametric effects, fault diagnostics and condition monitoring, and cracked rotors. This volume is of immense value to teachers, researchers in educational institutes, scientists, researchers in R&D laboratories and practising engineers in industry.
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1979 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Centrifugal Pumps written by Val S. Lobanoff and published by Elsevier. This book was released on 2013-10-22 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Centrifugal Pumps: Design and Application, Second Edition focuses on the design of chemical pumps, composite materials, manufacturing techniques employed in nonmetallic pump applications, mechanical seals, and hydraulic design. The publication first offers information on the elements of pump design, specific speed and modeling laws, and impeller design. Discussions focus on shape of head capacity curve, pump speed, viscosity, specific gravity, correction for impeller trim, model law, and design suggestions. The book then takes a look at general pump design, volute design, and design of multi-stage casing. The manuscript examines double-suction pumps and side-suction design, net positive suction head, and vertical pumps. Topics include configurations, design features, pump vibration, effect of viscosity, suction piping, high speed pumps, and side suction and suction nozzle layout. The publication also ponders on high speed pumps, double-case pumps, hydraulic power recovery turbines, and shaft design and axial thrust. The book is a valuable source of data for pump designers, students, and rotating equipment engineers.
Download or read book Prediction of Stiffness and Damping Coefficients for Centrifugal flow Compressor Labyrinth Seals written by H. R. Wyssmann and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Continued Investigation of Leakage and Power Loss Test Results for Competing Turbine Engine Seals written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Secondary seal leakage in jet engine applications results in power losses to the engine cycle. Likewise, seal power loss in jet engines not only result in efficiency loss but also increase the heat input into the engine resulting in reduced component lives. Experimental work on labyrinth and annular seals was performed at NASA Glenn Research Center to quantify seal leakage and power loss at various temperatures, seal pressure differentials, and surface speeds. Data from annular and labyrinth seals are compared with previous brush and finger seal test results. Data are also compared to literature. Annular and labyrinth seal leakage rates are 2 to 3 times greater than brush and finger seal rates. Seal leakage decreases with increasing speed but increases with increasing test temperature due to thermal expansion mismatch. Also seal power loss increases with surface speed, seal pressure differential, mass flow rate, and radial clearance. Annular and labyrinth seal power losses were higher than those of brush or finger seal data. The brush seal power loss was 15 to 30 percent lower than annular and labyrinth seal power loss. Delgado, Irebert R. and Proctor, Margaret P. Glenn Research Center NASA/TM-2006-214420, ARL-MR-0643, AIAA Paper 2006-4754, E-15638
