Download or read book Experimental High Speed Compressible Subsonic Flow Pressure Losses Across Gate Butterfly and Ball Valves and Their Use in Natural Gas Transmission Flow Control Simulation Software written by Kirk J. Gomes and published by . This book was released on 2011 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first part of the three parts that this work is divided into describes the simulation of a two-spool, two-stream turbofan engine modeled independently using Modelica (Dymola), MATLAB/Simulink and the Numerical Propulsion System Simulation (NPSS). The model contains steady-state performance maps for all of the components and has control volumes where continuity and energy balances are maintained. Rotor dynamics and duct momentum dynamics are also included. Steady state design and off-design points as well as transients can be simulated. The results of the simulation using the three modern tools are compared with the published results obtained using DIGTEM (Digital Computer Program for Generating Dynamic Turbofan Engine Models) and the pros and cons of each modern program are examined. The second part describes the experimental results obtained by measuring pressure losses across gate, butterfly and ball valves subjected to compressible flow. Experimental data has been collected for all possible combinations of gate, butterfly and ball valves with nominal diameters of 0.5", 0.75", 1", and 1.25" and various valve flow areas, i.e. fully open, three quarter open, half open, and quarter open. The results have been compared to a similar study conducted using a ball valve with a nominal diameter of 1.5". The third and final part uses the results of the above two parts and describes the development and simulation of a natural gas transmission model. A gas turbine engine drives a compressor that is used to pump natural gas through a pipeline. Upstream of the compressor is a throttling valve used to control the mass flow rate. Downstream, the Weymouth equation is used to model the volumetric flow rate and pressure losses in the pipeline.
Download or read book Computational Fluid Dynamics Analysis of Butterfly Valve Performance Factors written by Adam Del Toro and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Butterfly valves are commonly used in industrial applications to control the internal flow of both compressible and incompressible fluids. A butterfly valve typically consists of a metal disc formed around a central shaft, which acts as its axis of rotation. As the valve's opening angle is increased from 0 degrees (fully closed) to 90 degrees (fully open), fluid is able to more readily flow past the valve. Characterizing a valve's performance factors, such as pressure drop, hydrodynamic torque, flow coefficient, loss coefficient, and torque coefficient, is necessary for fluid system designers to account for system requirements to properly operate the valve and prevent permanent damage from occurring. This comparison study of a 48-inch butterfly valve's experimental performance factors using Computational Fluid Dynamics (CFD) in an incompressible fluid at Reynolds numbers ranging approximately between 105 to 106 found that for mid-open positions (30-60 degrees), CFD was able to appropriately predict common performance factors for butterfly valves. For lower valve angle cases (10-20 degrees), CFD simulations failed to predict those same values, while higher valve angles (70-90 degrees) gave mixed results. (152 pages)
Download or read book An Investigation of Compressible Flow Through Butterfly Valves written by Martin Jesse Morris and published by . This book was released on 1987 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Simulation of Solid Contact impact and Gas Flow in a High Pressure Safety Valve written by and published by . This book was released on 2005 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work consists of finite element modelling of the sudden opening of a high pressure safety valve due to over-pressure in the tank it is protecting. Tank pressures on the order of 200 atmospheres drive the motion of a valve spindle which opens a flow path for the tank gas to escape to ambient. A mechanical stop incorporated into the interior of the valve body limits the length of travel of the spindle. When driven by such large pressure differences, the spindle impacts the stop and looses most of its kinetic energy through plastic deformation of both the spindle and the valve body. The small amount of energy stored elastically in these pieces and can cause a rebound of the spindle and re-impaction but with no further plastic deformation. In some instances the change in shape caused by the plastic deformation prevents the valve spring from returning the spindle to its closed position when the over-pressure fault subsides. An important question addressed in this study is whether a minor geometric modification to a common spindle design can prevent such valve failure. For the solid mechanics behavior, the time scales associated with the elastic wave dynamics are much smaller than those associated with global spindle dynamics and plastic deformations. Hence, they are not resolved in numerical modelling of the transient response of the system. Modal analysis of these vibratory motions is, however, considered in order to provide some understanding of the short-time solid-phase dynamics. As such, natural frequencies, mode shapes, and wave speeds are determined by both numerical and approximate analytical techniques and compared. Plastic deformation is determined in a quasi-static representation of the transient impact process. A sequence of static loadings is computed until a failure criterion is experienced. The 3D compressible flow of the tank gas as it escapes through the complex passageway in the valve is analyzed using a finite volume based computational fluid mechanics code. Simply modified spindle geometries involving chamfered perimeters of the contact surface are analyzed using the complete solid and fluid mechanics numerical models. The ability of chamfers alone to resolve the valve non-closure problem is assessed.
Download or read book Energy Loss in Liquid Flow in Gate Valves written by Walter J. Tudor and published by . This book was released on 1953 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fortran Programs for Chemical Process Design Analysis and Simulation written by A. Kayode Coker and published by Gulf Professional Publishing. This book was released on 1995-01-25 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical Computation. Physical Property Data. Fluid Flow. Equipment Sizing. Instrument Sizing. Compressors and Pump Hydraulics. Mass Transfer. Heat Transfer. Engineering Economics. Imperial/SI Units Conversion Table. Appendix A: Tables. Appendix B: Source Code Printouts.
Download or read book Low Speed Analysis of Mission Adaptive Flaps on a High Speed Civil Transport Configuration written by and published by . This book was released on 1999 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Predicting the Generation and Transmission of Noise from Control Valves in Compressible Flow written by A. E. Moore and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pipeline Rules of Thumb Handbook written by E.W. McAllister and published by Elsevier. This book was released on 2015-08-03 with total page 705 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in its sixth edition, Pipeline Rules of Thumb Handbook has been and continues to be the standard resource for any professional in the pipeline industry. A practical and convenient reference, it provides quick solutions to the everyday pipeline problems that the pipeline engineer, contractor, or designer faces. Pipeline Rules of Thumb Handbook assembles hundreds of shortcuts for pipeline construction, design, and engineering. Workable "how-to" methods, handy formulas, correlations, and curves all come together in this one convenient volume. Save valuable time and effort using the thousands of illustrations, photographs, tables, calculations, and formulas available in an easy to use format Updated and revised with new material on project scoping, plastic pipe data, HDPE pipe data, fiberglass pipe, NEC tables, trenching, and much more A book you will use day to day guiding every step of pipeline design and maintenance
Download or read book Engineering Thermofluids written by Mahmoud Massoud and published by Springer Science & Business Media. This book was released on 2005-09-16 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermofluids, while a relatively modern term, is applied to the well-established field of thermal sciences, which is comprised of various intertwined disciplines. Thus mass, momentum, and heat transfer constitute the fundamentals of th- mofluids. This book discusses thermofluids in the context of thermodynamics, single- and two-phase flow, as well as heat transfer associated with single- and two-phase flows. Traditionally, the field of thermal sciences is taught in univer- ties by requiring students to study engineering thermodynamics, fluid mechanics, and heat transfer, in that order. In graduate school, these topics are discussed at more advanced levels. In recent years, however, there have been attempts to in- grate these topics through a unified approach. This approach makes sense as thermal design of widely varied systems ranging from hair dryers to semicond- tor chips to jet engines to nuclear power plants is based on the conservation eq- tions of mass, momentum, angular momentum, energy, and the second law of thermodynamics. While integrating these topics has recently gained popularity, it is hardly a new approach. For example, Bird, Stewart, and Lightfoot in Transport Phenomena, Rohsenow and Choi in Heat, Mass, and Momentum Transfer, El- Wakil, in Nuclear Heat Transport, and Todreas and Kazimi in Nuclear Systems have pursued a similar approach. These books, however, have been designed for advanced graduate level courses. More recently, undergraduate books using an - tegral approach are appearing.
Download or read book A Computational Technique for High Subsonic Compressible Flow Past a Circular Cylinder on a Parallel Computer written by S. Rajan and published by . This book was released on 1972 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two phase Adiabatic Flow Through Gate Valve Inserted Into Horizontal Large Diameter Pipeline written by Salah Ali A. Masheiti and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Simulation of Flow Field Inside a Squeeze Film Damper and the Study of the Effect of Cavitation on the Pressure Distribution written by Milind Nandkumar Khandare and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Squeeze Film Dampers (SFDs) are employed in high-speed Turbomachinery, particularly aircraft jet engines, to provide external damping. Despite numerous successful applications, it is widely acknowledged that the theoretical models used for SFD design are either overly simplified or incapable of taking into account all the features such as cavitation, air entrainment etc., affecting the performance of a SFD. On the other hand, experimental investigation of flow field and dynamic performance of SFDs can be expensive and time consuming. The current work simulates the flow field inside the dynamically deforming annular gap of a SFD using the commercial computational fluid dynamics (CFD) code Fluent and compares the results to the experimental data of San Andrés and Delgado. The dynamic mesh capability of Fluent and a User Defined Function (UDF) was used to replicate the deforming gap and motion of the rotor respectively. Two dimensional simulations were first performed with different combinations of rotor whirl speed, operating pressures and with and without incorporating the cavitation model. The fluid used in the simulations was ISO VG 2 Mobil Velocite no. 3. After the successful use of the cavitation model in the 2D case, a 3D model with the same dimensions as the experimental setup was built and meshed. The simulations were run for a whirl speed of 50 Hz and an orbit amplitude of 74 um with no through flow and an inlet pressure of 31kPa (gauge). The resulting pressures at the mid-span of the SFD land were obtained. They closely agreed with those obtained experimentally by San Andrés and Delgado.
Download or read book Investigation of Two phase Flow Pressure Drop Across a Cylinder and Gate Valve written by Angela M. Forbes and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Industrial Burners Handbook written by Jr., Charles E. Baukal and published by CRC Press. This book was released on 2003-10-29 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid development in the field precipitated by the increased demand for clean burner systems has made the Industrial Burners Handbook into the fields go-to resource. With this resource, bestselling author, editor, and combustion expert Charles Baukal, Jr. has put together a comprehensive reference dedicated to the design and applications of indust
Download or read book A Theoretical and Experimental Investigation of the Pressure Drop Characteristics Across Various Geometrical Valves written by John Lewis Moulton and published by . This book was released on 1985 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
