Download or read book Use of Computer Analysis to Predict and Reduce Liquid Hammer Forces in High Pressure High Flow Liquid Oxygen Systems written by L. deQuay and published by . This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the advanced and final development phases of rocket engine component and subsystem testing failures are very likely to occur from time to time. To minimize or prevent damage or destruction to the components and to the test facility itself, high pressure oxygen supplied must be cut off rapidly on the order of 100 to 400 milliseconds. However, rapid cutoff of liquid oxygen, as well as, other liquids and high pressure gases can impart large pressure surges and hammer forces. For liquid and gaseous oxygen this phenomenon can initiate ignition and subsequent destruction of test articles as well as facility piping systems.
Download or read book Flammability and Sensitivity of Materials in Oxygen enriched Atmospheres written by Joel M. Stoltzfus and published by ASTM International. This book was released on 1991 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Thirty-four papers presented at the symposium of the same name held in Cocoa Beach, Florida, May 1991, begin with a keynote address on combustion fundamentals of low volatility materials in oxygen-enriched atmospheres, and continue in sections on development and evaluation of test methods, ignition and combustion of nonmetals and of metals, analysis of ignition mechanisms, material selection, and miscellaneous topics. Member price, $50.40. Annotation copyrighted by Book News, Inc., Portland, OR.
Download or read book NASA Tech Briefs written by and published by . This book was released on 1986 with total page 988 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 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Hammer in Pipe Line Systems written by J. Záruba and published by Elsevier. This book was released on 1993-05-05 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physical principles of water hammer are explained in this volume. The basic mathematical methods of solution of water hammer and ways of limiting its effects are covered. Detailed description is given of the method of characteristics and the corresponding programs for personal computers, which enables solution of water hammer in a wide variety of hydraulic systems encountered in practice. Examples are given of solution of water hammer of common pipe-line systems as well as calculation of the steady state of flow, the determination of discharge through a pipe-line, measurements of characteristics of valves, pumps, turbines, determination of the operating régime of a valve in order to ensure a desired pressure and discharge curve, etc. This book will be of interest to those civil, mechanical and petroleum engineers dealing with the design and operation of hydraulic systems.
Download or read book Modeling Force Main Systems for Surge Analysis and Studying Dynamic Response Due to Water Hammer written by Wissam Al-Taliby and published by . This book was released on 2015 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major impact of water hammer on force mains integrity include excessive pressure oscillation that is usually accompanied by pipe vibrations. Models for simulating force main water hammer response have been developed. All of these models were based on the method of characteristics (MOC) and most of them were not calibrated for the lack of efficient field data. Although predicting maximum pressure during the first wave cycle is sufficient in most applications, some applications require precise prediction of pressure damping. One-dimensional models usually over predict pressure oscillation beyond the first cycle since they are based on steady friction expressions. It is also not well understood how pipes vibrate during water hammer events. The objectives were to: i) predict transient pressure of a force main system by a water hammer model based on the wave characteristics method (WCM) using Surge 2012 software and that model would be calibrated, validated and then used to perform surge analysis, ii) apply a one-dimensional water hammer model to predict surge pressure beyond the first cycle, and iii) determine the vibration characteristics of a pipeline subjected to water hammer conditions induced by rapid valve closure. A data acquisition system coded by LabVIEW software was built to collect field data. The WCM-based Surge 2012 software was used to model the South Beaches Force Main Sewer System (SBFSS). The model was calibrated, validated, and used to conduct surge analysis. An experimental small scale pipeline system was built. Valve closure experiments at different pipe material types, lengths, flowrates, and closure speeds were conducted and the induced transient pressure and acceleration were measured. The pipeline was modeled using Surge 2012 and a sensitivity analysis was conducted to determine the parameters affecting damping of pressure waves. The SBFSS model predicted field pressure during steady and transient states. Existing surge control devices were predicted to be sufficient to protect the pipeline under the worst case operational scenario. Sensitivity analysis determined the parameters that affect the sufficiency of a one-dimensional model to address the pressure damping issue. Water hammer-induced vibration was found to occur simultaneously with and correlate to surge pressure rise for different pipe materials. A pipe with lower modulus of elasticity was found to vibrate with higher amplitude and lower frequency than one with lower modulus of elasticity under the same conditions. Reducing pipe length for the same material type resulted in lower surge pressures and vibration levels but higher frequency.
Download or read book The Engineering Index Annual written by and published by . This book was released on 1992 with total page 2264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.
Download or read book SURGE ANALYSIS AND THE WAVE PLAN METHOD written by Srinivasa Lingireddy and published by KYPipe LLC. This book was released on 2021-06-14 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book describes the causes and effects of transient (water hammer) events in liquid-filled pipes, and describes how the powerful and stable Wave Plan Method (WPM) can be used to address transients during surge modeling. The authors compare and contrast WPM with the Method of Characteristics (MOC), which is the other widely-used surge analysis tool. While MOC can be useful for many situations, the larger and more complex a model becomes, the more the computational efficiency of WPM is necessary to avoid longer and longer analysis times. The authors also describe how WPM is more generalizable than MOC, which is a term that describes a suite of tools consisting of several variants that were developed to address different modeling situations. This book provides details on surge modeling in general and the use of WPM in particular. This includes pressure attenuation, determination of wave speeds in different pipe types and various liquid media, pump and turbine characteristics curves, and the effects of boundary conditions. The discussion of boundary conditions includes an extensive look at the effects of the air-water interface as it applies to bulk air intrusion into pipelines, and as it relates to the use of air/vacuum valves as surge protection. The authors discuss surge protection design for different real-world scenarios, and how to model of a full list of surge control devices, including a detailed discussion of check valves. Last, the book describes the assumptions and uncertainties encountered during data collection and model building, and examines the potential effect of these uncertainties. Where uncertainties cannot be mitigated, the authors discuss ways to increase the safety factor of surge protection designs.
Download or read book Fluid Mechanics Water Hammer Dynamic Stresses and Piping Design written by Robert Allan Leishear and published by American Society of Mechanical Engineers. This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: For some, the use of the term "water hammer" evokes images of broken and bent piping, multi-million dollar damages, the loss of water supplies to cities, and the deaths of individuals due to water hammer accidents. Water hammer may be defined as an extreme fluid transient, occasionally recognized by loud banging, or hammering sounds, sometimes associated with fluid transients, which are caused by flow rate changes and resultant pressure surges, where the terms fluid transient and water hammer are frequently used interchangeably. The primary purpose of this text is to provide practicing engineers with the analytical tools required to identify water hammer concerns and prevent equipment damage, personnel injury, and fatalities. To do so, the principles of pipe system design with respect to fluid mechanics, valves, and pump operations are followed by basic structural piping design principles, water hammer theory, pipe system dynamics, and failure analysis. This text is intended for practicing engineers in the power and process piping areas who are concerned with the design, performance, and safety of piping equipment and components; specifically the identification, risk assessment, and prevention of water hammers in water, liquid, and steam piping systems. Relevant industries include power companies and utilities, pressure technology, valve and pipe manufacturers, and petro/chemical processing facilities. Overall, the text integrates multiple structural and fluids engineering disciplines to illustrate the principles of troubleshooting pipe systems for fluid flow problems and pipe failures.
Download or read book Prediction of Impact Pressures Forces and Moments During Vertical and Oblique Water Entry written by Wardlaw, Jr. (Andrew B.) and published by . This book was released on 1977 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: An engineering tool is described for calculating pressures and loads at high-speed water entry which is simple to use, inexpensive to exercise and applicable to a wide variety of geometries. A simplified potential model is used which replaces the water's free surface with an effective planar surface that is positioned using an empirical parameter available in the literature for a wide variety of shapes. To confirm predictions, calculations are compared to experiment for the oblique water entry of spheres, cones, disks, and cusps. Surface pressures agree well with measurement reflecting both the model geometry and location on the model. The calculated drag and lift exhibit close agreement with experimental values, particularly prior to the peak loads. At later times the shape of the hydraulic cavity must be taken into account and an approximate procedure for doing this is described. A computer code listing and sample computer runs are provided as well as instructions for using the code.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1992 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Resolution Methods for Incompressible and Low Speed Flows written by D. Drikakis and published by Springer. This book was released on 2010-10-22 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of incompressible ?ows is vital to many areas of science and te- nology. This includes most of the ?uid dynamics that one ?nds in everyday life from the ?ow of air in a room to most weather phenomena. Inundertakingthesimulationofincompressible?uid?ows,oneoftentakes many issues for granted. As these ?ows become more realistic, the problems encountered become more vexing from a computational point-of-view. These range from the benign to the profound. At once, one must contend with the basic character of incompressible ?ows where sound waves have been analytically removed from the ?ow. As a consequence vortical ?ows have been analytically “preconditioned,” but the ?ow has a certain non-physical character (sound waves of in?nite velocity). At low speeds the ?ow will be deterministic and ordered, i.e., laminar. Laminar ?ows are governed by a balance between the inertial and viscous forces in the ?ow that provides the stability. Flows are often characterized by a dimensionless number known as the Reynolds number, which is the ratio of inertial to viscous forces in a ?ow. Laminar ?ows correspond to smaller Reynolds numbers. Even though laminar ?ows are organized in an orderly manner, the ?ows may exhibit instabilities and bifurcation phenomena which may eventually lead to transition and turbulence. Numerical modelling of suchphenomenarequireshighaccuracyandmostimportantlytogaingreater insight into the relationship of the numerical methods with the ?ow physics.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1998 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heat Transfer and Fluid Flow in Minichannels and Microchannels written by Satish Kandlikar and published by Elsevier. This book was released on 2006 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: &Quot;This book explores flow through passages with hydraulic diameters from about 1 [mu]m to 3 mm, covering the range of minichannels and microchannels. Design equations along with solved examples and practice problems are also included to serve the needs of practicing engineers and students in a graduate course."--BOOK JACKET.
Download or read book Popular Science written by and published by . This book was released on 2004-09 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Popular Science gives our readers the information and tools to improve their technology and their world. The core belief that Popular Science and our readers share: The future is going to be better, and science and technology are the driving forces that will help make it better.
Download or read book Hydrodynamics of Pumps written by Christopher E. Brennen and published by Cambridge University Press. This book was released on 2011-03-28 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrodynamics of Pumps is a reference for pump experts and a textbook for advanced students. It examines the fluid dynamics of liquid turbomachines, particularly pumps, focusing on special problems and design issues associated with the flow of liquid through a rotating machine. There are two characteristics of a liquid that lead to problems and cause a significantly different set of concerns than those in gas turbines. These are the potential for cavitation and the high density of liquids, which enhances the possibility of damaging, unsteady flows and forces. The book begins with an introduction to the subject, including cavitation, unsteady flows and turbomachinery, basic pump design and performance principles. Chapter topics include flow features, cavitation parameters and inception, bubble dynamics, cavitation effects on pump performance, and unsteady flows and vibration in pumps - discussed in the three final chapters. The book is richly illustrated and includes many practical examples.
