Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Modelling Of Cavitation In Nozzles For Diesel Injection Applications
Download Modelling Of Cavitation In Nozzles For Diesel Injection Applications full books in PDF, epub, and Kindle. Read online Modelling Of Cavitation In Nozzles For Diesel Injection Applications ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Modelling of Cavitation in Nozzles for Diesel Injection Applications by : Kaushik Saha
Download or read book Modelling of Cavitation in Nozzles for Diesel Injection Applications written by Kaushik Saha and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Extreme low pressure regions develop in the high pressure direct injection fuel flow inside the fuel injector holes, compelling the liquid fuel to transform to vapour phase in the form of vapour cavities or bubbles, a phenomenon known as cavitation. The cavitation phenomenon determines the quality of primary atomization and hence a ffects the performance of direct injection diesel or gasoline engines. A cavitation model, coupled with the mixture multiphase approach and RNG k-e turbulence model, has been developed and implemented in this study for analysing cavitation. The cavitation model has been implemented in ANSYS Fluent platform. The model predictions have been compared with results from experimental works available in the literature. A good agreement of the model predictions has been observed. Comparisons of the model with other cavitation models (Schnerr & Sauer and Zwart-Gerber-Belamri) available in ANSYS Fluent have been carried out with both mixture and Eulerian-Eulerian multiphase approaches. The overall performance of the proposed model in comparison with other models has been observed to be more eff ective. The model has been further applied to diesel vs. biodiesel cavitation as biofuels are the greener alternatives of conventional fossil fuels in recent times. Additionally eff ects of property di erences between diesel and biodiesel, inlet pressure fluctuations have been investigated. Liquid phase viscosity has been observed to be the determining parameter amongst all the properties for cavitation characteristics. The present study has also assessed the relevance of following factors for the case of cavitation in diesel injectors : a) compressibility, b) stress of a flowing liquid, c) wall roughness and d) turbulence. The two phase flow passes through the nozzle at very high velocities and hence can no longer be considered incompressible. Stress can aff ect the inception of cavitation as the liquid under considerable stress can fail and then rupture to form cavities. In the real nozzles at microscopic levels there are always some non-uniformities or crevices that can aggravate cavitation and hence its importance should be assessed. The flow passage inside the injector is small enough to have high enough Reynolds number to get a turbulent flow. Moreover the turbulent fluctuations can cause drastic drop in the local pressure, even though the mean thermodynamic pressure is higher than the saturation pressure, causing unexpected cavitation. Parametric studies indicate that the compressibility becomes important at high pressure diff erences and e ffects of stress and turbulent pressure fluctuations are not significant for cavitation in diesel injectors. The eff ect of the inlet pressure fluctuation has also been assessed for diesel and biodiesel. Diesel appears to be more susceptible to pressure fluctuations compared to biodiesel due to the di fference in the viscosity. The developed cavitation model has been fi nally implemented to simulate cavitation in the complex geometry of a real fuel injector along with needle movements. Diesel vs. biodiesel cavitation has also been studied in the complex geometry to understand the e ffects of needle movements.
Book Synopsis Cavitation in Diesel Fuel Injector Nozzles by : David P. Schmidt
Download or read book Cavitation in Diesel Fuel Injector Nozzles written by David P. Schmidt and published by . This book was released on 1997 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Improvements in the fuel injection systems of internal combusion engines can substantially reduce the emission of harmful pollutants. The goal of this disseration is to understand the flow inside fuel injector nozzles and the implications fo rthe downstream spray.
Download or read book 諸願届書式類纂 written by and published by . This book was released on 1893 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cavitation and Bubble Dynamics by : Phoevos Koukouvinis
Download or read book Cavitation and Bubble Dynamics written by Phoevos Koukouvinis and published by Elsevier. This book was released on 2021-09-24 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavitation and Bubble Dynamics: Fundamentals and Applications examines the latest advances in the field of cavitation and multiphase flows, including associated effects such as material erosion and spray instabilities. This book tackles the challenges of cavitation hindrance in the industrial world, while also drawing on interdisciplinary research to inform academic audiences on the latest advances in the fundamentals. Contributions to the book come from a wide range of specialists in areas including fuel systems, hydropower, marine engineering, multiphase flows and computational fluid mechanics, allowing readers to discover novel interdisciplinary experimentation techniques and research results. This book will be an essential tool for industry professionals and researchers working on applications where cavitation hindrance affects reliability, noise, and vibrations. Covers a wide range of cavitation and bubble dynamics phenomena, including shock wave emission, jetting, and luminescence Provides the latest advice about applications including cavitation tunnels, cavitation testing, flow designs to avoid cavitation in pumps and other hydromachinery, and flow lines Describes novel experimental techniques, such as x-ray imaging and new computational techniques
Book Synopsis Modelling of Cavitation in Automotive Fuel Injector Nozzles by :
Download or read book Modelling of Cavitation in Automotive Fuel Injector Nozzles written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Large-eddy Simulation Analysis of the Influence of the Needle Lift on the Cavitation in Diesel Injector Nozzles by :
Download or read book Large-eddy Simulation Analysis of the Influence of the Needle Lift on the Cavitation in Diesel Injector Nozzles written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Applications of Computational Fluid Dynamics Simulation and Modeling by : Suvanjan Bhattacharyya
Download or read book Applications of Computational Fluid Dynamics Simulation and Modeling written by Suvanjan Bhattacharyya and published by BoD – Books on Demand. This book was released on 2022-10-26 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides well-balanced coverage of computational fluid dynamics analysis for thermal and flow characteristics of various thermal and flow systems. It presents the latest research work to provide insight into modern thermal engineering applications. It also discusses enhanced heat transfer and flow characteristics.
Book Synopsis High Speed Flow Simulation in Fuel Injector Nozzles by : Sukanta Rakshit
Download or read book High Speed Flow Simulation in Fuel Injector Nozzles written by Sukanta Rakshit and published by . This book was released on 2012 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atomization of fuel is essential in controlling combustion inside a direct injection engine. Controlling combustion helps in reducing emissions and boosting efficiency. Cavitation is one of the factors that significantly affect the nature of spray in a combustion chamber. Typical fuel injector nozzles are small and operate at a very high pressure, which limit the study of internal nozzle behavior. The time and length scales further limit the experimental study of a fuel injector nozzle. Simulating cavitation in a fuel injector will help in understanding the phenomenon and will assist in further development. The construction of any simulation of cavitating injector nozzles begins with the fundamental assumptions of which phenomena will be included and which will be neglected. To date, there has been no consensus about whether it is acceptable to assume that small, high-speed cavitating nozzles are in thermal or inertial equilibrium. This diversity of opinions leads to a variety of modeling approaches. If one assumes that the nozzle is in thermal equilibrium, then there is presumably no significant delay in bubble growth or collapse due to heat transfer. Heat transfer is infinitely fast and inertial effects limit phase change. The assumption of inertial equilibrium means that the two phases have negligible slip velocity. Alternatively, on the sub-grid scale level, one may also consider the possibility of small bubbles whose size responds to changes in pressure. Schmidt et al. developed a two dimensional transient homogeneous equilibrium model which was intended for simulating a small, high speed nozzle flows. The HEM uses the assumption of thermal equilibrium to simulate cavitation. It assumes the two-phase flow inside a nozzle in homogeneous mixture of vapor and liquid. This work presents the simulation of high-speed nozzle, using the HEM for cavitation, in a multidimensional and parallel framework. The model is extended to simulate the non-linear effects of the pure phase in the flow and the numerical approach is modified to achieve stable result in multidimensional framework. Two-dimensional validations have been presented with simulation of a venturi nozzle, a sharp nozzle and a throttle from Winklhofer et al. Three-dimensional validations have been presented with simulation of 'spray A' and 'spray H' injectors from the Engine Combustion Network. The simulated results show that equilibrium assumptions are sufficient to predict the mass flow rate and cavitation incidence in small, high-speed nozzle flows.
Book Synopsis Two-Phase Flow for Automotive and Power Generation Sectors by : Kaushik Saha
Download or read book Two-Phase Flow for Automotive and Power Generation Sectors written by Kaushik Saha and published by Springer. This book was released on 2018-11-03 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the two-phase flow problems relevant in the automotive and power generation sectors. It includes fundamental studies on liquid–gas two-phase interactions, nucleate and film boiling, condensation, cavitation, suspension flows as well as the latest developments in the field of two-phase problems pertaining to power generation systems. It also discusses the latest analytical, numerical and experimental techniques for investigating the role of two-phase flows in performance analysis of devices like combustion engines, gas turbines, nuclear reactors and fuel cells. The wide scope of applications of this topic makes this book of interest to researchers and professionals alike.
Book Synopsis Proceedings of the 1st International Conference on Fluid, Thermal and Energy Systems by : Sudev Das
Download or read book Proceedings of the 1st International Conference on Fluid, Thermal and Energy Systems written by Sudev Das and published by Springer Nature. This book was released on 2024-01-17 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the proceedings of the 1st International Conference on Fluid, Thermal and Energy Systems. The contents of this book focus on phase change heat transfer, advanced energy systems, separated flows, turbulence and multi-phase modeling, computational fluid flow and heat transfer, thermal energy storage systems, integrated energy systems, nuclear thermal hydraulics, heat transfer in nanofluids, etc. This book serves as a useful reference to researchers, academicians, and students interested in the broad field of thermo-fluid science and engineering.
Book Synopsis LES of Atomization and Cavitation for Fuel Injectors by : Aqeel Ahmed
Download or read book LES of Atomization and Cavitation for Fuel Injectors written by Aqeel Ahmed and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents Large Eddy Simulation (LES) of fuel injection, atomization and cavitation inside the fuel injector for applications related to internal combustion engines. For atomization modeling, Eulerian Lagrangian Spray Atomization (ELSA) model is used. The model solves for volume fraction of liquid fuel as well as liquid-gas interface surface density to describe the complete atomization process. In this thesis, flow inside the injector is also considered for subsequent study of atomization. The study presents the application of ELSA model to a typical diesel injector, both in the context of RANS and LES. The model is validated with the help of experimental data available from Engine Combustion Network (ECN). The ELSA model which is normally designed for diffused (unresolved) interfaces, where the exact location of the liquid-gas interface is not considered, is extended to work with Volume of Fluid (VOF) type formulation of two phase flow, where interface is explicitly resolved. The coupling is achieved with the help of Interface Resolution Quality (IRQ) criteria, that takes into account both the interface curvature and modeled amount of interface surface. ELSA model is developed first considering both phases as incompressible, the extension to compressible phase is also briefly studied in this thesis, resulting in compressible ELSA formulation that takes into account varying density in each phase. In collaboration with Imperial College London, the Probability Density Function (PDF) formulation with Stochastic Fields is also explored to study atomization. In modern fuel injection systems, quite oftenthe local pressure inside the injector falls below the vapor saturation pressure of the fuel, resulting in cavitation. Cavitation effects the external flow and spray formulation. Thus, a procedure is required to study the phase change as well as jet formulation using a single and consistent numerical setup. A method is developed in this thesis that couples the phase change inside the injector to the external jet atomization. This is achieved using the volume of fluid formulation where the interface is considered between liquid and gas; gas consists of both the vapor and non condensible ambient air.
Book Synopsis Fluid Mechanics and Fluid Power, Volume 3 by : Krishna Mohan Singh
Download or read book Fluid Mechanics and Fluid Power, Volume 3 written by Krishna Mohan Singh and published by Springer Nature. This book was released on 2024-01-16 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select peer-reviewed proceedings of the 9th International and 49th National Conference on Fluid Mechanics and Fluid Power (FMFP 2022). This book brings together scientific ideas and engineering solutions put forth by researchers and practitioners from academia and industry in the important and ubiquitous field of fluid mechanics. The contents of this book focus on fundamental issues and perspective in fluid mechanics, measurement techniques in fluid mechanics, computational fluid and gas dynamics, instability, transition and turbulence, fluid-structure interaction, multiphase flows, microfluidics, bio-inspired fluid mechanics, aerodynamics, turbomachinery, propulsion and power and other miscellaneous topics in the broad domain of fluid mechanics. This book is a useful reference to researchers and professionals working in the broad field of mechanics.
Author :James H.W. Whitelaw Publisher :Springer Science & Business Media ISBN 13 :9783540426653 Total Pages :460 pages Book Rating :4.4/5 (266 download)
Book Synopsis Thermo-and Fluid-dynamic Processes in Diesel Engines by : James H.W. Whitelaw
Download or read book Thermo-and Fluid-dynamic Processes in Diesel Engines written by James H.W. Whitelaw and published by Springer Science & Business Media. This book was released on 2002-01-11 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume includes versions of papers selected from those presented at the THIESEL 2000 Conference on Thermofluidynamic Processes in Diesel Engines, held at the Universidad Politecnica de Valencia, during the period of September th th 13 to 15 , 2000. The papers are grouped into seven thematic areas: State of the Art and Prospective, Fuels for Diesel Engines, Injection System and Spray Formation, Combustion and Pollutant Formation, Modelling, Experimental Techniques, and Air Management. These areas cover most of the technologies and research strategies that may allow Light Duty and Heavy Duty Diesel engines to comply with current and forthcoming emission standards, while maintaining or improving fuel consumption. The main objectives of the conference were to bring together ideas and experience from Industry and Universities to facilitate interchange of information and to promote discussion of future research and development needs. The technical papers emphasised the use diagnostic and simulation techniques and their relationship to engineering practice and the advancement of the Diesel engine. We hope that this approach, which proved to be successful at the Conference, is reflected in this volume. We thank all those who contributed to the success of the Conference, and particularly the members of the Advisory Committee who assessed abstracts and chaired many of the technical sessions. Weare also grateful to participants who presented their work or contributed to the many discussions. Finally, the Conference benefitted from financial support from the organisations listed below and we are glad to have this opportunity to record our gratitude.
Book Synopsis Scientific and Technological Advances in Materials for Energy Storage and Conversions by : Basant Singh Sikarwar
Download or read book Scientific and Technological Advances in Materials for Energy Storage and Conversions written by Basant Singh Sikarwar and published by Springer Nature. This book was released on with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cavitation in Real-Size Diesel Injector Nozzles by : Luca Liverani
Download or read book Cavitation in Real-Size Diesel Injector Nozzles written by Luca Liverani and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Supercavitation written by Igor Nesteruk and published by Springer Science & Business Media. This book was released on 2012-01-13 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection is dedicated to the 70th jubilee of Yu. N. Savchenko, and presents experimental, theoretical, and numerical investigations written by an international group of well-known authors. The contributions solve very important problems of the high-speed hydrodynamics,such as supersonic motion in water, drag diminishing, dynamics and stability of supercavitating vehicles, water entry and hydrodynamic performances of hydrofoils, ventilated cavities after a disc and under the ship bottom. The book is written for researches, scientists, engineers, and students interested in problems of hydromechanics.
Book Synopsis Analysis of Geometric Parameters of the Nozzle Orifice on Cavitating Flow and Entropy Production in a Diesel Injector by : Fraj Echouchene
Download or read book Analysis of Geometric Parameters of the Nozzle Orifice on Cavitating Flow and Entropy Production in a Diesel Injector written by Fraj Echouchene and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this chapter, we investigated the effect of geometric parameters of the nozzle orifice on cavitating flow and entropy production in a diesel injector. Firstly, we analyzed the effect of some parameters of diesel injector such as the nozzle length and the lip rounding on cavitating flow. In the second parts, we studied the entropy production inside the diesel injector in several cases: -single phase and laminar flow,- single phase and turbulent flow and ,Äìtubulent cavitating flow. In the last case, the mixture model cupled with k-Œμ turbulent model has been adopted. The effects of average inlet velocity and cavitation number on entropy production have been presented and discussed. The results obtained show that the discharge coefficient is weakly influenced by the length of the orifice and the radius of the wedge has a large effect on the intensity and distribution of cavitation along the injection nozzle. On the other hand, the study of entropy production inside the diesel injector shows that the entropy production is important near the wall and increases whith increasing the average inlet velocity and pressure injection.
