Experimental Investigation of Near-nozzle Characteristics of Gasoline Sprays from Pressure-swirl Atomisers PDF Download
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Author:
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Category :
Languages : en
Pages : 608
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 608
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Author: Ethan Hanson
Publisher:
ISBN:
Category : Atomization
Languages : en
Pages : 51
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Book Description
"In a combustion environment, system instabilities and dynamic responses of components can have a major influence on performance, emissions, and product life. One of the key components in a combustion system are the fuel injectors which utilize instabilities to generate a well atomized fuel spray. In this work, a pressure-swirl atomizer was studied under steady state operation and oscillating pressure differential conditions to simulate a dynamic system input to the atomizer. Atomizer spray with and without the addition of a pre-filming surface was evaluated to determine the influence that a pre-filming surface has on the dynamic response of the liquid sheet near the atomizer exit. High-speed video was utilized to capture the response of the liquid sheet and quantify the instability. It was found that under steady state operating conditions, the pre-filming surface increased the atomizer flow number and discharge coefficient. When comparing spray edge variation, the atomizer without a pre-filming surface demonstrated an increasing spray edge variation with increasing pressure while the opposite trend was observed in the atomizer with a pre-filming surface. Under conditions with an oscillating pressure differential, additional spray edge variation was observed near field of the atomizer exit but was nonexistent further downstream indicating that the superposition of the fluid from pressure oscillation dissipated as it moved further from the atomizer exit and did not have an impact on wave growth in the liquid sheet."--Abstract.
Author: Nasser Ashgriz
Publisher: Springer Science & Business Media
ISBN: 1441972641
Category : Technology & Engineering
Languages : en
Pages : 922
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Book Description
Atomization and sprays are used in a wide range of industries: mechanical, chemical, aerospace, and civil engineering; material science and metallurgy; food; pharmaceutical, forestry, environmental protection; medicine; agriculture; meteorology and others. Some specific applications are spray combustion in furnaces, gas turbines and rockets, spray drying and cooling, air conditioning, powdered metallurgy, spray painting and coating, inhalation therapy, and many others. The Handbook of Atomization and Sprays will bring together the fundamental and applied material from all fields into one comprehensive source. Subject areas included in the reference are droplets, theoretical models and numerical simulations, phase Doppler particle analysis, applications, devices and more.
Author: Arthur H. Lefebvre
Publisher: CRC Press
ISBN: 1498736262
Category : Technology & Engineering
Languages : en
Pages : 284
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Book Description
The second edition of this long-time bestseller provides a framework for designing and understanding sprays for a wide array of engineering applications. The text contains correlations and design tools that can be easily understood and used in relating the design of atomizers to the resulting spray behavior. Written to be accessible to readers with a modest technical background, the emphasis is on application rather than in-depth theory. Numerous examples are provided to serve as starting points for using the information in the book. Overall, this is a thoroughly updated edition that still retains the practical focus and readability of the original work by Arthur Lefebvre.
Author: Benjamin Sebastian Balewski
Publisher:
ISBN: 9783832290016
Category : Aerospace engineering
Languages : en
Pages : 143
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Book Description
Author: Joshua D. Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 182
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Book Description
Atomization can be achieved by discharging liquid at relative high velocities into a slow moving environment (hydraulic nozzles) or by discharging liquid at low velocities into a fast moving gas flow (air-blast nozzles). These two types of injector nozzles are featured in majority of the industry applications such as power generation, food or pharmaceutical powder formation, spray painting, petroleum refining, and thermal sprays. The most common atomizer used in combustion engines is the pressure-swirl nozzle (Simplex nozzle) to obtain a homogenous mixture at different equivalence ratios. The experimental studies performed with pressure-swirl nozzles have reported contradictory results over the last few years. Thus, the fundamentals of spray dynamics, such as spray formation, liquid breakup length, droplet breakup regimes, and coalescence still need to be understood for a pressure-swirl nozzle. An experimental study of the breakup characteristics of various liquids and fuels with different thermal physical properties emanating from hollow cone hydraulic injector nozzles induced by pressure-swirling was investigated. The experiments were conducted using two nozzles with different orifice diameters 0.3mm and 0.5mm and injection pressures (0.3-4MPa) which correspond to Rep = 7,000-31,000 depending on the liquids being tested.
Author: L.P. Bayvel
Publisher: Routledge
ISBN: 1351434950
Category : Science
Languages : en
Pages : 488
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Book Description
Covering the basics of liquid atomization, this book familiarizes readers with the physical processes of liquid atomization, the main types of atomizers and their design, measurements of spray characteristics, experimental investigations of atomizers, and application of atomizers. It demonstrates how to calculate and design atomizers and how to mea
Author:
Publisher:
ISBN:
Category : Atomization
Languages : en
Pages : 626
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Five cases are examined in which a spray field generated by a commercial simplex nozzle is influenced by the counter-rotating flow structure created by a production CFM56 swirl cup. The first case involving water atomization at an equivalence ratio of 0.7 and an air temperature of 100ʻF acts as the baseline for this study. Subsequent cases assess the effects of different liquids, water or Jet-A fuel, of different equivalence ratios, 0.7 or 1.1, and different air temperatures, 100ʻF or 400ʻF. Digital images employing a laser sheet offer some qualitative flow visualization of the spray. In addition, measurements are conducted with a two-dimensional Phase Doppler Particle Analyzer system within close proximity to the swirl cup exit plane, which provides the three principle orthogonal velocities and a diameter distribution throughout the spray field. Combined, this information provides insight to the characteristics of liquid spray behavior and its sensitivity to varying these parameters.
Author: Pretam K. Choudhury
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Book Description
Pressure swirl atomizers are commonly used in IC, aero-engines, and liquid propellant rocket combustion. Understanding the atomization process is important in order to enhance vaporization, mitigate soot formation, design of combustion chambers, and improve overall combustion efficiency. This work utilizes non-invasive techniques such as ultra -speed imaging, and Phase Doppler Particle Anemometry (PDPA) in order to investigate the cascade atomization process of pressure-swirl atomizers by examining swirling liquid film dynamics and the localized droplet characteristics of the resulting hollow cone spray. Specifically, experiments were conducted to examine these effects for three different nozzles with orifice diameters .3mm, .5mm, and .97mm. The ultra-speed imaging allowed for both visualization and interface tracking of the swirling conical film which emanated from each nozzle. Moreover, this allowed for the measurement of the radial fluctuations, film length, cone angle and maximum wavelength. Radial fluctuations are found to be maximum near the breakup or rupture of a swirling film. Film length decreases as Reynolds number increases. Cone angle increases until a critical Reynolds number is reached, beyond which it remains constant.
