Numerical investigation of evaporation phenomena of liquid fuel jet atomization in crossflow

Abstract Liquid fuel jet in Crossflow (LJIC) is a vital atomization technique significant to the aviation industry. The hydrodynamic instability mechanisms that drive a primary breakup of a transverse jet are investigated using modal and traveling wavelength analysis. This study highlights the primary breakup mechanisms for aviation fuel Jet-A, utilizing a method that could be applied to any liquid fuel. Mathematical decomposition techniques known as POD (Proper Orthogonal Decomposition) and Robust MrDMD (Multi-Resolution Dynamic Mode Decomposition) are used together to identify dominant instability flow dynamics associated with the primary breakup mechanism. Implementation of the Robust MrDMD method deconstructs the nonlinear dynamical systems into multiresolution time-scaled components to capture the intermittent coherent structures. The Robust MrDMD, in conjunction with the POD method, is applied to data points taken across the entire spray breakup regimes: enhanced capillary breakup, bag breakup, multimode breakup, and shear breakup. The dominant frequencies of breakup mechanisms are extracted and identified. These coherent structures are classified with an associated time scale and Strouhal number. Three primary breakup mechanisms, namely ligament shedding, bag breakup, and shear breakup, were identified and associated with the four breakup regimes outlined above. Further investigation portrays these breakup mechanisms to occur in conjunction with each other in each breakup regime, excluding the low Weber number Enhanced Capillary Breakup regime. Spectral analysis of the Robust MrDMD modes' entire temporal window reveals that while multiple breakup mechanisms are convolved, there is a dominant breakup route for each breakup regime. An associated particular traveling wavelength analysis further investigates each breakup mechanism. Lastly, this study explores the effects of an increased momentum flux ratio on each breakup mechanism associated with a breakup regime.

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CHANGES IN THE AREA BRIGHTNESS OF DIESEL FUEL SPRAY ZONES

Alternative energy sources in the transport-technological complex problems and prospects of rational use of ◽

10.12737/17911 ◽

2016 ◽

Vol 3 (1) ◽

pp. 506-509

Author(s):

Кулманаков ◽

S. Kulmanakov ◽

Кирюшин ◽

I. Kiryushin

Keyword(s):

Diesel Fuel ◽

Liquid Fuel ◽

Pressure Range ◽

Injection Pressure ◽

Fuel Spray ◽

Experimental Setup ◽

Jet Injection ◽

Axial Section ◽

Fuel Jet ◽

Fuel Stream

The article contains a description of the experimental setup and the stent-speed video atomized fuel stream, applicable for the study of the jet sputtering process liquid fuel. In axial section shows information about the dynamics of the area of the normalized luminance zones in the diesel fuel jet injection pressure range of 60 MPa to 180 MPa

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1836 Numerical Investigation of Optimum Liquid Fuel Split-Injection in a Combustion Chamber

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2007.7.0_177 ◽

2007 ◽

Vol 2007.7 (0) ◽

pp. 177-178

Author(s):

Akhyarsi Odi ◽

Yuzuru Nada ◽

Susumu Noda

Keyword(s):

Combustion Chamber ◽

Numerical Investigation ◽

Liquid Fuel ◽

Split Injection

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Numerical investigation of the liquid fuel particles movement in the schematic duct ramjet

10.1063/1.4964077 ◽

2016 ◽

Author(s):

D. A. Vnuchkov ◽

D. G. Nalivaychenko ◽

A. V. Starov ◽

V. I. Zvegintsev

Keyword(s):

Numerical Investigation ◽

Liquid Fuel ◽

Fuel Particles

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Combustion Characteristics of a Peripheral Vortex Reverse Flow Combustor With Coaxial Fuel Injection

Journal of Energy Resources Technology ◽

10.1115/1.4046386 ◽

2020 ◽

Vol 142 (5) ◽

Cited By ~ 1

Author(s):

Raghav Sood ◽

Preetam Sharma ◽

Vaibhav Kumar Arghode

Keyword(s):

Liquid Fuel ◽

Fuel Injection ◽

Reverse Flow ◽

Flame Structure ◽

Operating Conditions ◽

Single Digit ◽

Air Jet ◽

Fuel Jet ◽

Primary Breakup ◽

Reaction Zones

Abstract This paper deals with an experimental investigation of a novel and simple reverse flow combustor, operated stably with a liquid fuel (ethanol) for heat release intensities ranging from 16 to 25 MW/(m3·atm) with very low NOx and CO emissions. The liquid fuel is injected coaxially with the air jet along the centerline of the combustor. The high velocity air annulus helps in primary breakup of the liquid fuel jet. Air injection along the combustor centerline results in a strong peripheral vortex inside the combustor leading to enhanced product gas recirculation, internal preheating of the reactants, and stabilization of reaction zones. Single-digit NOx emissions were obtained for both coaxial fuel injection (non-premixed) and a premixed–prevaporized (PP) cases for all operating conditions. CO emissions for both the modes were less than 100 ppm (ϕ < 0.75). CH* chemiluminescence images revealed two distinct flame structures for coaxial fuel injection case. A single flame structure for PP case was observed extending from the injector exit to the bottom of the combustor. The instantaneous (spatially averaged) CH* intensity fluctuations were significantly lower for the PP case as compared to the coaxial fuel injection case.

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High Pressure Diesel Engine Modeling

Design and Control of Diesel and Natural Gas Engines for Industrial and Rail Transportation Applications ◽

10.1115/icef2003-0721 ◽

2003 ◽

Author(s):

Riccardo Baudille ◽

Gino Bella ◽

Rossella Rotondi

Keyword(s):

Liquid Fuel ◽

Initial Conditions ◽

Injection Velocity ◽

Dimensional Model ◽

Flow Conditions ◽

One Dimensional ◽

Engine Modeling ◽

Fuel Jet ◽

Initial Drop ◽

The One

In multi hole Diesel injectors, cavitation can offer advantages in the development on the fuel spray, because the primary atomization of the liquid fuel jet can be improved due to the enhanced turbulence. Several multi dimensional models of cavitating nozzle flow have been developed in order to provide information about the flow at the exit of a cavitating orifice. In this paper an analytical one-dimensional model, by Sarre et al. [1], to predict the flow conditions at the exit of a cavitating nozzle, is analyzed. The results obtained are compared with the ones obtained using the multi dimensional code Fluent in order to investigate the predictive capability of the one-dimensional code. The model provides initial conditions for multidimensional spray modeling: the effective injection velocity and the initial drop or injected liquid ‘blob’ size. The simulations were performed using an improved version of the KIVA3V code, in which an hybrid break up model, developed by the authors, is used and the results in terms of penetrations and global SMD are compared with the experimental ones. The one dimensional model predicts reasonable discharge coefficient for sharp injector geometry. Where the r/d ratio increases and the cavitation effects appear not clearly marked there are same discrepancies between the one dimensional and the multidimensional approach.

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