Experimental Study on Diesel Spray Characteristics and Autoignition Process

Taşkıran, Özgür Oğuz; Ergeneman, Metin

doi:10.1155/2011/528126

Cited by 47 publications

(30 citation statements)

References 45 publications

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“…5 for both diesel and diesel-CNG dual fuel. The rate of spray tip penetration was reduced in both cases as the ambient temperature increased which was in agreement with the findings of Taşkiran and Ergenman [25]. This was caused by the loss of momentum of the jet due to the liquid evaporation.…”

Section: E Spray Tip Penetration Measurementsupporting

confidence: 91%

“…The spray tip penetration rate for both fuels increased with elapsed time. It can be seen that , most of the upstream region of the spray did not reach its fully developed shape which was in agreement with previous study of Taşkiran and Ergenman [25]. …”

supporting

confidence: 92%

“…The findings of this work on penetration rate (liquid phase under evaporation) with time agree with both Kennaird et al [17] and Sazhin et al [16] who found that the penetration was linear with time. The main reasons for the vapour jet transport was the losses of the momentum of the jet by the surrounding air motion as suggested by [25], [26].To go further in the comparison between sprays of single diesel fuel and diesel-CNG dual fuel, the diesel injection pressure was changed to 500, 600 and 700 bar at 500 K temperature as depicted in Fig. 7.…”

mentioning

confidence: 99%

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Spray Characteristics and Wall Impingement of Diesel-CNG Dual Fuel Jet Using Schlieren Imaging Technique

Ismael¹,

Heikal²,

Bahroom³

2015

IJMMM

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.my).the natural gas inside the engine. In addition, this system does not favor the two-stroke engine due to the escape of some of the natural gas fuel into the exhaust [3]. The second method of using natural gas in diesel engines is the direct injection of natural gas near to the diesel fuel spray into the combustion chamber [4]. Thus a full stratification of the fuel-air mixture can be obtained with good flammability over the entire load range.Recently, successful operation has been demonstrated by applying this method using a prototype co-injector [5], resulting in diesel-gas two phase mixtures which were then injected into the chamber. The authors recommended that the jet penetration should be imaged and characterized to further understand the complex two-phase flow phenomena. It appears that direct injection of natural gas with diesel pilot ignition is one of the most promising ways of meeting the energy crises and emissions regulation, analogous to the benefits provided by a common rail high pressure direct injection engine.Actually, the development of high performance natural gas DIEs is unclear as the macroscopic characteristics of the diesel-CNG dual fuel jet which differs considerably from that of diesel fueled compression ignition (CI) and spark ignition (SI) engines. In diesel-CNG dual fuel engine, the performance of the engine is influence significantly by the quality of the diesel fuel sprays and CNG jet propagation. Those characteristics can be classified into two basic categories: Macroscopic and microscopic. The first one, which involves spray tip penetration, spray cone-angle, and their derivatives and the second, involves droplet velocity, droplet size, size distribution and air fuel ratio [6]. Improvement of the diesel-CNG dual fuel jet characteristics such as jet tip penetration, jet cone angle and jet velocity in turn determine the diesel-CNG dual fuel combustion process and the associated formation of pollutants. In addition, these characteristics not only aim to improve the engine efficiency, but also assist the understanding of parameters used to judge fuel spray performance [7]. For example, the spray penetration length must neither be too long nor short in a combustion chamber. If too long, impingement could occur resulting in wetting of cylinder walls and/or piston crown [8]. Spray-wall impingement can be characterized into radial penetration along the wall and jet height. Improvement of those characteristics leads to enhance the mixture formation as well as the combustion process. The present work investigates the jet propagation of jets created by CNG and diesel injectors with aid of flow visualization. Based on the previous studies, it is well known that the injection strategy and the atomization play an important role for the diesel Materials, Mechanics and Manufacturing, Vol. 3, No. 3, August 2015 spray, and the mixture formation is largely dependent upon the droplet distribution and evaporation [9]. In contrast with diesel spray, natural gas does not have droplets and evapor...

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Section: E Spray Tip Penetration Measurementsupporting

confidence: 91%

supporting

confidence: 92%

mentioning

confidence: 99%

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Spray Characteristics and Wall Impingement of Diesel-CNG Dual Fuel Jet Using Schlieren Imaging Technique

Ismael¹,

Heikal²,

Bahroom³

2015

IJMMM

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“…The code was started with 3000 parcel and it is automatically increased up to 7000 parcel in the calculation. The experimental results were obtained with a constant volume vessel of which details and experimental technique are presented in [10].…”

Section: Computational Resultsmentioning

confidence: 99%

“…The trajectory based collision model was implemented into the KIVA3V Rel2 code and results of droplet calculations were compared with collision model of the O'Rourke which was accepted as the standard model [6]. In the last section of this study, by considering macroscopic characteristics, the KIVA spray simulation results have been compared with experimental spray images that were obtained by injecting fuel into a constant volume vessel [10].…”

Section: Introductionmentioning

confidence: 99%

Trajectory based droplet collision model for spray modeling

Taşkıran¹,

Ergeneman

2014

Fuel

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This study presents a droplet collision model which takes into account trajectories of colliding droplets. Droplet collision dynamics can be represented more realistically by using a trajectory based model since collisions are calculated by the position and velocity vectors of droplets. Unlike the O'Rourke's model which is used in KIVA code, the presented model is not mesh dependent. The key point of the model is defining the droplet impact parameter. In this study, a new calculation method of impact parameter, which is based on binary droplet collision model, is presented. The impact parameter of two colliding droplet is obtained by following their colliding trajectory. The algorithm was implemented into the KIVA3V Rel2 code and obtained droplet calculations were compared with O'Rourke's collision model. Binary collision of droplet pairs were taken into account and the impact parameter of two colliding droplets was calculated from their position and velocity vectors. The new model represents the physical process of collusion more accurately since it uses colliding droplets in the calculations. ______________________________________________________________________ Keywords: Droplet collision, impact parameter, spray modeling. * Corresponding author: Tel: +90 532 601 33 51 E-mail address: taskiranoz@itu.edu.tr IntroductionThe numerical spray modeling offers very important and valuable information for the calculation of diesel spray combustion. KIVA3V R2 code, which is a Computational Fluid Dynamics (CFD) program used for engine research, describes the spray dynamics and combustion process with related sub-models, such as breakup, collision, evaporation models and etc.Droplet collision is an important physical part of numerical spray calculations. Droplet collisions affect the spray propagation, droplet evaporation and distribution by changing the droplet number and size. In the standard KIVA3V R2 code which uses Discrete Droplet Model (DDM), the collisions may give two physical results; coalescence and grazing [1]. In fact, there are other important physical results of droplet collisions [2]. Qian and Law [3] defined the results of collision of hydrocarbon droplets as bouncing, coalescence, reflexive separation, stretching separation (grazing) and shattering collision. The standard KIVA code is based on the O'Rourke's [4] collision sub-model and the calculations proceeds with the basic steps given below. Droplets groups are represented by the parcels and all droplets in a parcel behave in the same way. The collision calculation is performed for the pair of particles if they are in the same cell. The collision probability Pn, that a larger parcel undergoes "n" collisions with smaller parcel, is assumed to follow a Poisson distribution [1].The standard collision model has the disadvantage of being mesh dependent since there is a requirement that the parcels must be in the same cell to be taken into the collision calculation. A finer mesh would include less droplet parcels and the collision probability depen...

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Efficiency Improvement of Internal Combustion Engines Over Time

Baweja

Kumar

2021

Energy, Environment, and Sustainability

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Experimental Study on Diesel Spray Characteristics and Autoignition Process

Cited by 47 publications

References 45 publications

Spray Characteristics and Wall Impingement of Diesel-CNG Dual Fuel Jet Using Schlieren Imaging Technique

Spray Characteristics and Wall Impingement of Diesel-CNG Dual Fuel Jet Using Schlieren Imaging Technique

Trajectory based droplet collision model for spray modeling

Efficiency Improvement of Internal Combustion Engines Over Time

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