A Study of Mixture Formation and Combustion for Spray Guided DISI

Honda, Tetsuya; Kawamoto, Masaaki; Katashiba, Hideaki; Sumida, Mamoru; Fukutomi, Norihisa; Kawajiri, Kazuhiko

doi:10.4271/2004-01-0046

Cited by 31 publications

(3 citation statements)

References 4 publications

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“…These challenges become more pronounced when dealing with twoand three-wheeler vehicles due to their smaller engine size [7,8]. Comprehensively, in DISI engines, charge motion and mixture preparation have been determined to have the greatest impact on engine efficiency and combustion stability [9,10]. As a result, comprehending the intricate in-cylinder processes becomes crucial for development of small DISI engines for two-and three-wheeler applications.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of Mechanical and Thermal Stresses, Temperature and Displacement within the Transparent Cylinder and Piston Top of a Small Direct-Injection Spark-Ignition Optical Engine

Velugula,

Thiruvallur loganathan,

Varadhaiyengar

et al. 2023

Energies

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Two- and three-wheeled vehicles account for a significant portion of the automobile market in several countries worldwide. In order to advance the capabilities of these vehicles, the integration of direct-injection (DI) technology is essential, given its potential benefits such as high thermal efficiency and low engine-out emissions. Direct injection in small-bore engines, however, further complicates the challenges involved (of DI technology) like fuel impingement and mixture inhomogeneity inside the engine cylinder, driving the need for an in-depth exploration of in-cylinder processes. Consequently, the necessity arises to develop a small-bore direct-injection spark-ignition (DISI) optical engine that incorporates a transparent cylinder and piston top. In this scenario, these transparent components are required to endure a combination of intricate loads and boundary conditions, hence the potential to result in failures. This work aims to assess numerically the effects of these loads and boundary conditions on the transparent components and optimize their thicknesses. For this purpose, a computer-aided design model of a small-bore DISI optical engine (displacement volume of 200 cm3) is developed. The mechanical and thermal loads are extracted from the experimental data and validated computational fluid dynamics model of the same engine configuration. A coupled temperature-displacement finite element analysis methodology is developed in ABAQUS/CAE, and simulations are performed under both steady and transient conditions. Temperature and combined stress distributions within the transparent cylinder and piston top are obtained and analyzed to find their optimum thicknesses. Knowing thermal gradients, combined stresses and displacements under actual conditions helped design the small optical engine with an improved factor of safety.

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Section: Introductionmentioning

confidence: 99%

An Analysis of Mechanical and Thermal Stresses, Temperature and Displacement within the Transparent Cylinder and Piston Top of a Small Direct-Injection Spark-Ignition Optical Engine

Velugula,

Thiruvallur loganathan,

Varadhaiyengar

et al. 2023

Energies

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“…Flow field inside the engine cylinder is one of the most important factors controlling the fuel combustion process and hence engine performance [1,2]. This realization arises in the automotive engine community after attaining relatively significant knowledge on in-cylinder flows and their cycleto-cycle variations in the past few decades, while noticing the occasional dominance of the high-speed fuel spray in preparation of combustible air-fuel mixture [3][4][5]. Flow measurement techniques such as laser Doppler velocimetry (LDV [6][7][8][9]), particle image velocimetry (PIV [10][11][12][13][14][15]), and molecular tagging velocity (MTV [16]) continue to play a crucial role in understanding in-cylinder flows of an automotive engine.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study to Improve Subpixel Accuracy of Nitric Oxide Tagging Velocimetry with Image Preprocessing

Vedula

Mittal

Schock

2017

Journal of Combustion

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Biacetyl phosphorescence has been the commonly used molecular tagging velocimetry (MTV) technique to investigate in-cylinder flow evolution and cycle-to-cycle variations in an optical engine. As the phosphorescence of biacetyl tracer deteriorates in the presence of oxygen, nitrogen was adopted as the working medium in the past. Recently, nitrous oxide MTV technique was employed to measure the velocity profile of an air jet. The authors here plan to investigate the potential application of this technique for engine flow studies. A possible experimental setup for this task indicated different permutations of image signal-to-noise ratio (SNR) and laser line width. In the current work, a numerical analysis is performed to study the effect of these two factors on displacement error in MTV image processing. Also, several image filtering techniques were evaluated and the performance of selected filters was analyzed in terms of enhancing the image quality and minimizing displacement errors. The flow displacement error without image preprocessing was observed to be inversely proportional to SNR and directly proportional to laser line width. The mean filter resulted in the smallest errors for line widths smaller than 9 pixels. The effect of filter size on subpixel accuracy showed that error levels increased as the filter size increased.

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“…The number of injection exits of multi-hole injectors and their layout can be made to offer the flexibility in adapting the spray pattern layout to a particular combustion chamber design. The investigation on multi-hole injectors for gasoline engines has confirmed the improved spray stability in terms of spray cone angle compared to the swirl injectors [7][8][9][10][11][12][13][14]. In addition to the spray characteristics studies, experimental investigation has also been carried out inside injectors, demonstrating the complicity of in-nozzle flow caused by cavitations that in turn influence the stability of sprays exiting the injectors [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effects of intake flow and coolant temperature on the spatial fuel distribution in a direct-injection gasoline engine by PLIF technique

Kim

Yan

Nouri

et al. 2013

Fuel

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Citation: Kim, S., Yan, Y., Nouri, J. M. and Arcoumanis, C. (2013). Effects of intake flow and coolant temperature on the spatial fuel distribution in a direct-injection gasoline engine by PLIF technique. Fuel, 106, This is the accepted version of the paper.This version of the publication may differ from the final published version.Permanent repository link: http://openaccess.city.ac.uk/6073/ Link to published version: http://dx. Abstract:The spatial fuel distributions of the homogeneous and stratified charge of a high pressure 6-hole injector were examined in a single cylinder optical direct injection spark ignition (DISI) engine. The effects of in-cylinder charge motion, fuel injection pressure and coolant temperature were investigated using a planar laser induced fluorescence (PLIF) technique. It was found that in the case of homogeneous charge mode, early injection in the intake stroke generated similar fuel distributions at the crank angle of 12° BTDC regardless of the in-cylinder air motion at the coolant temperature of 90°C. In the case of stratified charge mode, the in-cylinder tumble flow played more effective role in mixture preparation than the swirl flow during the compression stroke; and the increase of the coolant temperature improved fuel evaporation; but the increase of the fuel supplying pressure could not change the pattern of the fuel vapour distribution against the expectation.

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A Study of Mixture Formation and Combustion for Spray Guided DISI

Cited by 31 publications

References 4 publications

An Analysis of Mechanical and Thermal Stresses, Temperature and Displacement within the Transparent Cylinder and Piston Top of a Small Direct-Injection Spark-Ignition Optical Engine

An Analysis of Mechanical and Thermal Stresses, Temperature and Displacement within the Transparent Cylinder and Piston Top of a Small Direct-Injection Spark-Ignition Optical Engine

Parametric Study to Improve Subpixel Accuracy of Nitric Oxide Tagging Velocimetry with Image Preprocessing

Effects of intake flow and coolant temperature on the spatial fuel distribution in a direct-injection gasoline engine by PLIF technique

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