Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions

Wang, Zhaowen; Wu, Songbin; Huang, Yuhan; Chen, Yulin; Shi, Shaojun; Cheng, Xiaobei; Huang, Ronghua

doi:10.3390/en10081109

Cited by 12 publications

(8 citation statements)

References 35 publications

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“…Visualisation techniques are sometimes applied in engine configurations with optical access [14,15] (using either a modified or a specially-built engine). Alternatively, a constant volume vessel (CVV) can be used at either similar conditions to real engines [16][17][18][19] or at atmospheric conditions [20,21] because design and fabrication of an engine with an optical window is a costly and complex option [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends

2018

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Optimising the combustion process in compression ignition (CI) engines is of interest in current research as a potential means to reduce fuel consumption and emission levels. Combustion optimisation can be achieved as a result of understanding the relationship between spraying technique and combustion characteristics. Understanding macroscopic characteristics of spray is an important step in predicting combustion behaviour. This study investigates the impact of injector hole diameter on macroscopic spray characteristics (spray penetration, spray cone angle, and spray volume) of butanol-diesel blends. In the current study, a Bosch (0.18 mm diameter) and a Delphi (0.198 mm) injector were used. Spray tests were carried out in a constant volume vessel (CVV) under different injection conditions. The test blends were injected using a solenoid injector with a common rail injection system and images captured using a high-speed camera. The experimental results showed that the spray penetration (S) was increased with larger hole diameter. Spray penetration of a 20% butanol-80% diesel blend was slightly further than that of neat diesel. Spray penetration of all test fuels was increased as a result of increased injection pressure (IP), while spray cone angle (θ) was slightly widened due to the increase in either hole diameter or injection pressure. Spray volume of all test fuels was increased as a result of increased hole diameter or injection pressure. Thus, an efficient diesel engine performance can be achieved as a result of controlling injection characteristics, especially when using a promising additive like butanol blended with diesel.

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Section: Introductionmentioning

confidence: 99%

The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends

2018

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“…However, there is trade-off relation between NO x and soot formation for combustion of a diesel engine [26,27]. These literatures have focused on the low-temperature combustion (LTC) [8,[28][29][30][31]. The results support the view that LTC has the potential to reduce soot and NO X emission simultaneously.…”

Section: Introductionmentioning

confidence: 76%

“…Many studies focused on the development and application of biomass energy. These literatures [6][7][8][9][10][11] investigated the performance and emission of a diesel engine fuelled with biomass fuels and its blends. Their results show that biomass fuels could be a potential fuel for diesel engines.…”

Section: Introductionmentioning

confidence: 99%

Spray Combustion Characteristics and Soot Emission Reduction of Hydrous Ethanol Diesel Emulsion Fuel Using Color-Ratio Pyrometry

Zhang

et al. 2017

Energies

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To elucidate the relationship between physicochemical properties, spray characteristics, and combustion performance, a series of experiments have been conducted in a constant volume vessel with injection of hydrous ethanol diesel emulsion and regular diesel. HE30 (emulsion with 30% volume fraction of 20% water-containing ethanol and 70% volume fraction of 0# diesel) is developed using Shah's technique and regular diesel is also employed for comparison. Firstly, the physicochemical properties of two kinds of fuels are investigated. Then, the non-evaporating and evaporating spray characteristics are examined through the high-speed shadowgraphs. Finally, spray combustion experiments under different ambient oxygen concentrations are carried out, and color-ratio pyrometry (CRP) is applied to measure the flame temperature and soot concentration (KL) distributions. The results indicate that the physicochemical properties, such as density, surface tension, kinematic viscosity, cetane number, and oxygen content, have significant impact on the spray mixture formation and combustion performance. HE30 exhibits lower soot emissions than that of regular diesel. Further analysis supports the standpoint that the hydrous ethanol diesel emulsion can suppress the soot and NO x simultaneously. Therefore, the hydrous ethanol diesel emulsion has great potential to be an alternative clean energy resource.

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“…The area provided suitable equivalence ratio and temperature for ignition. 16 Figure 8(a) and (b) shows temporal change of integrated luminosity and mean temperature each. From (a), we could find the higher the injection pressure was, the smaller and shorter the luminosity became, because the flame natural luminosity comes primarily from soot incandescence and chemiluminescence.…”

Section: Combustion Flame Behavior and Wall Heat Transfer At Differenmentioning

confidence: 99%

Effects of injection pressure and impingement distance on flat-wall impinging spray flame and its heat flux under diesel engine-like condition

Mahmud

Kurisu

Nishida

et al. 2019

Advances in Mechanical Engineering

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Heat loss is one of the main causes of energy losses in modern direct injection diesel engines. This heat loss of the engine occurs during combustion, mainly due to the heat transfer between the impinging spray flame and the piston cavity wall. It is of more critical in small size engines. In order to decrease heat transfer, we need to examine the phenomenon of heat transfer through the combustion chamber walls more fully. To achieve this, we investigated the effects of flame impingement on transient heat flux to the wall. By using a constant volume vessel with a fixed impingement wall, the surface heat flux of the wall at the locations of spray flame impingement was measured with three thin film thermocouple heat flux sensors. The combined effect of impingement distance and injection pressure on the heat transfer was investigated parametrically. The results showed that an increase of injection pressure with longer impinging distance led to an increase in the heat transfer coefficient, which had a dominant effect on local heat flux compared with local temperature distribution. Moreover, we confirmed that the relation between Nusselt number and Reynolds number is a useful measure for describing the heat transfer phenomena in diesel combustion.

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Evaporation and Ignition Characteristics of Water Emulsified Diesel under Conventional and Low Temperature Combustion Conditions

Cited by 12 publications

References 35 publications

The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends

The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends

Spray Combustion Characteristics and Soot Emission Reduction of Hydrous Ethanol Diesel Emulsion Fuel Using Color-Ratio Pyrometry

Effects of injection pressure and impingement distance on flat-wall impinging spray flame and its heat flux under diesel engine-like condition

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