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Investigation Of Microflow Machining Effects On Diesel Injector Spray Characteristics
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Book Synopsis Investigation of Microflow Machining Effects on Diesel Injector Spray Characteristics by : Ana Cristina Holguin
Download or read book Investigation of Microflow Machining Effects on Diesel Injector Spray Characteristics written by Ana Cristina Holguin and published by . This book was released on 2003 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study of Diesel Spray Characteristics and Atomization by : Chan-Teng Chang
Download or read book Experimental Study of Diesel Spray Characteristics and Atomization written by Chan-Teng Chang and published by . This book was released on 1997 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of the Spray Characteristic for Valve Covered Orifice Diesel Nozzle Injector Using CFD by : Ahmad Aizuddin Faiz Che Jaafar
Download or read book A Study of the Spray Characteristic for Valve Covered Orifice Diesel Nozzle Injector Using CFD written by Ahmad Aizuddin Faiz Che Jaafar and published by . This book was released on 2013 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diesel engine performance and emissions are strongly coupled with fuel atomization and spray processes, which in turn are strongly influenced by injector flow dynamics. Modern engines employ micro-orifice with different orifice designs. It is critical to characterize the effects of various designs on engine performance and emissions. Spray characteristic of diesel fuel injection is one of the most important factors in diesel combustion and pollutant emissions where the interval between the onset of combustion and the evaporation of atomized fuel is relatively short. Therefore, this project is to study the spray simulation of diesel fuel using valve covered orifice (VCO) nozzle injector in the closed chamber. Three main components are focused on this paper, first is the relation between the spray characteristic influences of the various ambient temperature,. The second focus is the influences of the injection pressure,to the spray characteristic and the third focus is relation between the various diameter of nozzle hole size to the spray characteristic. Good spray characteristic leads to the good drivability, high combustion efficiency and stoichiometric air-fuel mixture. Therefore,Computational Fluid Dynamics (CFD) method using ANSYS Fluent simulation software is used for this purpose. The simulation of injection spray in chamber is conducted by using diesel fuel with the single and double-hole Valve Covered Orifice (VCO) nozzle, injection pressure, were various in range 5 KPa - 150 MPa, the ambient pressure, at atmosphere pressure at 101.325 Pa, the ambient temperature,was various in range of 273 K - 1000 K and at the same time iteration.
Book Synopsis Quantification of Spray Characteristics Associated with Unique Diesel Injector Nozzles by : Erica Lynn Blobaum
Download or read book Quantification of Spray Characteristics Associated with Unique Diesel Injector Nozzles written by Erica Lynn Blobaum and published by . This book was released on 2001 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Fundamental Investigation of Microflow and Atomisation Processes in Automotive Injectors by : Yong Chuan Khoo
Download or read book A Fundamental Investigation of Microflow and Atomisation Processes in Automotive Injectors written by Yong Chuan Khoo and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent developments in automotive engines have been directed towards the reduction of engine emissions in order to minimise their effect on the environment. A major part of this advancement has been the improvement of new direct injection injectors providing improved atomisation and better control of the fuel delivery into the combustion chamber. To aid the injector design process, it is vital to understand the fundamental fluid dynamic processes controlling atomisation of high-pressure fluids in Direct Injection injectors. The research effort is directed towards the ability to link changes to the internal nozzle geometry and flow field to the external atomisation processes. This thesis presents a detailed laser diagnostic investigation of Diesel and gasoline direct injectors for automotive applications. There is a need to increase our understanding of injector flow processes occurring both internally and externally to a high-pressure fuel atomiser and the physical phenomena in generating atomised fuel in the combustion chamber. The characterisation of Diesel injector flow was achieved by the use of series of real-sized, optically accessible sapphire Diesel injectors, capable of operating at realistic driving pressures through orifice nozzles of 0.15 mm and 0.3 mm diameter. High-speed, laser-illuminated flow visualisation was used to study the effect of injector geometry on the internal flow field and the nearfield external spray structure. Data in this thesis shows that operating an injector with a counterbore provides a methodology for controlling spray angle. The study of gasoline injectors was to develop and apply innovative measurement techniques, using a series of real-sized (1 mm diameter) optical nozzles, to provide data to link the internal flow structure to the external spray development. The investigation of non-swirl flow with sharp-edged inlets nozzle showed that cavitation completely controls the flow development. Fluorescent Particle Image Velocimetry (FPIV) experiments on all chamfered inlet nozzles (30°, 45° and 60°) showed that the total velocity increased linearly with driving pressure. High-speed flow visualisation study showed that high-pressure swirl injectors generate tapered aircore in the 30° and 45° chamfered inlet orifice and parallel aircores for 60° chamfered inlet orifices. The results also showed that the film thickness was dependent of driving pressure and nozzle geometry. Application of fluorescent particle image velocimetry (FPIV) was used to provide results for internal flow velocity field for the full range of injector geometries studied. A semi-empirical relationship was used and the empirical constants was modified to fit the current experimental results. For the final optical diagnostic tool, phase Doppler anemometry (PDA) was used to provide profiles of particle size in the external spray. Examples of particle size results were shown that matched findings presented in the literature.
Book Synopsis Analysis of Diesel Spray Characteristic at High Pressure Injection by : Norsyamsul Syazwan Mohd Nuji
Download or read book Analysis of Diesel Spray Characteristic at High Pressure Injection written by Norsyamsul Syazwan Mohd Nuji and published by . This book was released on 2012 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: In diesel combustion, spray evaporation and mixture formation during ignition delay period play an important role in ignition, combustion and emission production. Spray evaporation begins immediately after start of fuel injection under the condition of high ambient temperature, in particular, at the middle of the spray. Spray atomization is fast promoted at this region, leading to ignition. The ambient temperature and injection pressures affect the droplets size and the number of droplets. In this project, the fuel will be injected at various injection parameters inside spray chamber in order to study the affect of that parameter towards spray characteristics. An analysis study was performed to investigate the macroscopic spray structure and the spray characteristics of high-pressure injector for the diesel engine. The spray structure and microscopic characteristics of high-pressure diesel injector were investigated when fuel was injected at various injection pressures and different nozzle diameter. Spray developing process, spray cone angle and spray tip penetration were obtained by using the software simulation of ANSYS-FLUENT, and the quantitative result of spray characteristics will be analyzes.
Book Synopsis Annual Index/abstracts of SAE Technical Papers 2004 by :
Download or read book Annual Index/abstracts of SAE Technical Papers 2004 written by and published by . This book was released on 2005 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spray Characteristics of Compound Silicon Micro Machined Port Fuel Injector Orifices by : scott E. Parrish
Download or read book Spray Characteristics of Compound Silicon Micro Machined Port Fuel Injector Orifices written by scott E. Parrish and published by . This book was released on 1993 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of High Injection Pressure Diesel Sprays by : Tzay-Fa Su
Download or read book An Experimental Study of High Injection Pressure Diesel Sprays written by Tzay-Fa Su and published by . This book was released on 1995 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis SAE 2002-30-0005, The Influence of Injector Parameters on Diesel Spray by : C. Bae
Download or read book SAE 2002-30-0005, The Influence of Injector Parameters on Diesel Spray written by C. Bae and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diesel injection nozzles, incorporated with common-rail, high-pressure injection system, have the variety in its geometries. The design parameters of injection nozzle need to meet the requirement of compact fuel spread and atomization followed by mixing with air and combustion in HSDI (High-Speed Direct Injection) diesel engines. Diesel injectors with various nozzle geometries were tested to investigate the spray characteristics by optical-imaging techniques. Sac-nozzle and VCO nozzle incorporated with common-rail system were tested to see the behavior of high-pressure injection. Detailed investigation into spray characteristics from the holes of VCO nozzles, mostly with double guided needle, was performed. A variety of injection hole geometries was tested and compared to give tips on better injector design. Different hole sizes and taper ratio, represented as K factor, were studied through comprehensive spray-imaging techniques. Global characteristics of non-evaporative transient diesel spray, such as spray penetration and spray angle were measured from macroscopic images, which were frozen by an instantaneous photography with spark light source and CCD camera. Internal structure during spray development for atomization was analyzed from microscopic images, which was manifested through magnified spray images taken by a long-distance microscope. These provided the better understanding of the spray surface structure and the primary breakup process of dense spray from VCO nozzles incorporated with common-rail injection system. Fuel droplet sizes, mainly represented by SMD (Sauter Mean Diameter) were also estimated from the images. Spray images were taken in a pressurized chamber (up to 30 bar) at various ambient conditions and fuel supply pressures for various nozzle geometries. The spray development from sac-nozzle and VCO nozzle was discussed. The holes with different geometry in nozzles, especially differently tapered holes (0~2 in K factor), were found to give different macroscopic behavior in terms of spray penetration and spray angle and subsequently various atomization performances. Higher K factor and smaller exit hole sizes showed faster penetration, especially at lower ambient pressure, and smaller spray angle.
Book Synopsis Experimental and Numerical Study on Diesel Spray Characteristics and Combustion Process by : Özgür Oğuz Taşkıran
Download or read book Experimental and Numerical Study on Diesel Spray Characteristics and Combustion Process written by Özgür Oğuz Taşkıran and published by . This book was released on 2011 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Diesel Spray Characteristics at High Injection by :
Download or read book A Study of Diesel Spray Characteristics at High Injection written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Diesel Spray Characteristic Using Single Hole SAC Nozzle and VCO Nozzle by : Mohd Fazwan Ishak
Download or read book Analysis of Diesel Spray Characteristic Using Single Hole SAC Nozzle and VCO Nozzle written by Mohd Fazwan Ishak and published by . This book was released on 2012 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was focus to investigate the diesel spray characteristics and atomization performance. The influences of injector nozzle geometry and injection pressure conditions on a diesel fuel spray were examined and predicted by using ANSYS FLUENT software. A flow domain and constant volume combustion chamber was designed and temperature was set 540 K at pressure 1 MPa for simulations. Spray penetration length and cone angle of diesel spray were recorded. To investigate the influence of nozzle geometry, Sac and VCO (Valve Covers Orifice) with difference diameter orifice and injection pressure were designed and used in both spray evolution. Comparisons were made between different nozzle geometries and different injection pressures. Differences were observed between VCO and Sac nozzles, with the Sac nozzles showing a higher rate of penetration under the same conditions.
Book Synopsis Effects of Flash Boiling Fuel Injection on Spray Characteristics, Combustion, and Engine Performance in Direct Injection and Indirect Injection Diesel Engines by : Nobuyuki Yamazaki
Download or read book Effects of Flash Boiling Fuel Injection on Spray Characteristics, Combustion, and Engine Performance in Direct Injection and Indirect Injection Diesel Engines written by Nobuyuki Yamazaki and published by . This book was released on 1985 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Spray Characteristics and Ignition Processes at Conditions Representative of Large Two-Stroke Marine Diesel Engines by : Beat Von Rotz
Download or read book Experimental Investigation of Spray Characteristics and Ignition Processes at Conditions Representative of Large Two-Stroke Marine Diesel Engines written by Beat Von Rotz and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Fuel Properties on Diesel Spray Characteristics by : Timothy J. Callahan
Download or read book Effects of Fuel Properties on Diesel Spray Characteristics written by Timothy J. Callahan and published by . This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis HIGH INJECTION PRESSURE IMPINGING DIESEL SPRAY CHARACTERISTICS AND SUBSEQUENT SOOT FORMATION IN REACTING CONDITIONS by :
Download or read book HIGH INJECTION PRESSURE IMPINGING DIESEL SPRAY CHARACTERISTICS AND SUBSEQUENT SOOT FORMATION IN REACTING CONDITIONS written by and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : The spray impingement in diesel engines attracts the attention of engine researchers in recent decades as the physical size of the engine is reduced. Due to the spray impingement, the atomization, vaporizing and air-fuel mixing quality is altered compared to a free spray. For emission control, soot is one of the major particulate emissions from diesel combustion and its formation in an impinged spray is worthy to be investigated. Firstly, to understand the impinged spray characteristics, the experiments for both non-vaporizing and reacting conditions were conducted in a constant volume combustion vessel. The impinged spray was captured by a high-speed camera and the instantaneous spray propagation distance and rate were obtained. For a better understanding, the microscopic behavior of the spray propagation, the curvature of the impinged spray was calculated and a relationship between local fuel distribution and soot formation was found. After that, the apparent heat release rate from an impinge spray combustion and the heat flux through the impingement were analyzed. The apparent heat release rate was obtained by the internal chamber pressure and the heat flux was measured by heat flux probes embedded in the impinging plate. Then, the soot formation of an impinged spray was both studied from experiments and simulations. In the experiments, the natural luminosity mainly due to the incandescence of soot particles was captured by the high-speed camera. A computational fluid dynamics (CFD) approach was adopted to quantitatively study the soot formation in terms of absolute soot mass and soot mass fractions in the vicinity of the wall. In the last, the film formation under different ambient temperatures, impinging distances, and oxygen concentration was investigated in terms of film area and thickness. The impact of film formation on the soot outcomes was then investigated by comparing the rate of film vaporization and soot formation. To summarize, the main goal of this dissertation is going to benefit the understanding of the impinged spray in reacting diesel-relevant engine conditions. From experiments, a global view of soot formation in an impinged spray was analyzed and the mechanism of soot formation was further revealed by the CFD simulations.
