Effect of fuel temperature on the methanol spray and nozzle internal flow

Chen, Zhifang; Yao, Anren; Yao, Chunde; Yin, Zhiwei; Han, Xu; Geng, Peng; Zhang, Dou; Hu, Jiangtao; Wu, Taoyang; Ming, Ma

doi:10.1016/j.applthermaleng.2016.12.025

Cited by 26 publications

(12 citation statements)

References 37 publications

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“…The SMD of biodiesel decreases markedly with increasing fuel temperature. The cavitation flow inside the nozzle is motivated owing to the rise in fuel temperature, 43 the turbulence kinetic energy at the exit of nozzle increases because of cavity collapse, which is beneficial to initial atomization. In addition, with increasing fuel temperature, the kinematic viscosity and surface tension of biodiesel reduce, the atomization degree and breakup of fuel droplets is intensified, and the evaporation velocity of atomized droplets is accelerated.…”

Section: Influence Of Fuel Temperature On Biodiesel Spray Charactermentioning

confidence: 99%

Numerical simulation of the influence of fuel temperature and injection parameters on biodiesel spray characteristics

Geng

Wang

et al. 2019

Energy Science & Engineering

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The purpose of this study is to investigate the effects of fuel temperature and nozzle length‐diameter ratio (L/D) on biodiesel spray characteristics, under high injection pressure and high ambient pressure, by numerical method. The analysis of spray characteristics is carried out in conjunction with the transient flow inside nozzle. To achieve this, three‐dimensional calculation grids of spray nozzle and spray domain were setup, and the needle movement was achieved by dynamic mesh technique. The reliability of spray models was validated by experimental results. It was established that the variation in spray tip penetration (STP) and Sauter mean diameter (SMD) is similar at different initial conditions. The STP increases at a faster rate initially and then slows down, whereas the SMD gradually decreases with time after the injection. In addition, a sensitivity analysis of the effects of injection parameters on biodiesel spray characteristics was conducted. Compared to the nozzle L/D, injection pressure and fuel temperature have a greater impact on biodiesel spray characteristics. The increase in injection pressure has a significant effect on the velocity distribution, STP and SMD. When the injection pressure is increased from 100 to 200 MPa, the maximum velocity of the spray core zone increases by 33.96%, the STP increases by 27.17%, and the SMD reduces by 14.81%. Furthermore, an increase in fuel temperature mainly affects the concentration distribution and the SMD of atomized droplets. When the fuel temperature is increased from 300 to 350 K, the maximum concentration of axial spray center lowers by 25.41%, and the SMD decreases by 17.19%. However, the increase of L/D chiefly impacts the concentration of axial spray center, but has little effect on other spray parameters. When the nozzle L/D is increased from 4 to 8, the maximum concentration of axial spray center increases by 20.29%.

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Section: Influence Of Fuel Temperature On Biodiesel Spray Charactermentioning

confidence: 99%

Numerical simulation of the influence of fuel temperature and injection parameters on biodiesel spray characteristics

Geng

Wang

et al. 2019

Energy Science & Engineering

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“…The delay of combustion due to higher velocity of droplets (as mentioned in the previous paragraph) and the reduction in injection rate tend to decrease the flame temperature. However, increased fuel temperature reduces droplets size, improves the spray atomization, and accelerates the droplets evaporation and mixing rate, which increase the flame temperature [23]. Furthermore, smaller droplets size and fast evaporation of droplets at higher inlet fuel temperatures lead to higher flame temperature in the flame upstream region and make the flame temperature more uniform than what it is at lower inlet temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…Zhifang Chen et al [23] studied the effect of temperature on injection characteristics, including nozzle exit velocity, discharge coefficient and the diameters of droplets. The findings of this work showed that as fuel temperature increased, the nozzle exit velocity increased, while the discharge coefficient and the Sauter mean diameter decreased.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the effect of inlet diesel fuel temperature on mass flow choking, flame penetration, temperature, radiative characteristics and NOx pollutant emission of an oil burner

Pourhoseini

Nikzad

2019

J Braz. Soc. Mech. Sci. Eng.

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The aim of the present work is to investigate the effect of inlet diesel fuel temperature of an oil burner on mass flow choking, flame penetration, temperature, radiative characteristics and NOx pollutant emission. Diesel fuel was heated up, in an insulated reservoir tank containing a thermostat, to the selected temperatures of 15, 45 and 75 °C, and then, flame characteristics were measured. SBG01 water cooled heat flux sensor and TES-1332A digital luminance meter were used to determine the total and luminous radiations of the flame. Furthermore, a KIGAS 310 gas analyzer measured the concentrations of pollutant emissions. It was found that increase in inlet fuel temperature resulted in no mass flow choking, no cavitation and insignificant change in the effective area of the oil burner nozzle. However, increase in fuel temperature increased the droplets injection velocity and the flame penetration length. Furthermore, increase in fuel temperature reduced the droplets size, improved the spray atomization and accelerated the droplets evaporation and, consequently, increased the flame temperature. Also, when the fuel temperature increased from 15 to 75 °C, the average flame radiation heat flux was enhanced as much as 44.5%, and NOx emission decreased significantly from 33 to 13 ppm. Keywords Inlet diesel fuel temperature • Mass flow choking • Flame penetration • Radiation • NO X emission List of symbols NOx Nitrogen oxides ID Internal diameter CO Carbon monoxide W R Total uncertainty R The function uncertainty x 1 , x 2 , x n Independent variables W x 1 , W x 2 , W x n The uncertainties of the independent variables K Coverage factoṙ m Mass flow rate V Velocity ρ Density A Area CO 2 Carbon dioxide H 2 O Water vapor O 2

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“…It is anticipated that there will be a 45% growth in heavy-duty vehicles by 2040 [4]; meanwhile, the CO2 emission standard is becoming more stringent [5]. To fulfill the ever more strict CO2 reduction target, the direct solution is to employ eco-friendly and low-carbon fuels, such as hydrogen and methanol [6,7]. Simultaneously, continuing efforts are needed to improve engine efficiencies to make an immediate impact on the environment.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effect of injection strategy on a high-pressure isobaric combustion engine

Liu

Aljabri

Al-lehaibi

et al. 2021

International Journal of Engine Research

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High-pressure isobaric combustion adopted in the double compression expansion engine (DCEE) has the prospect to achieve higher thermal efficiency compared to conventional diesel combustion. This work numerically explored the effects of various injection strategies on the combustion and emission characteristics of isobaric combustion. The study developed a mathematical model to predict the injection rate profile. After validations, extensive simulations were conducted with a peak pressure of up to 300 bar – mimicking the high-pressure unit of DCEE. Several major engine design parameters such as the exhaust recirculation gas (EGR) rate, engine speed, injection strategy, and intake pressure were varied and evaluated. The results demonstrated that a higher EGR rate resulted in a higher exhaust loss but a lower heat transfer loss owing to the lower combustion temperature, so the thermal efficiency exhibited a firstly growing and then declining trend. Besides, a higher engine speed generated a higher thermal efficiency due to the shorter combustion duration and thus lower heat transfer loss. Consequently, a peak thermal efficiency of 47.5% was achieved at EGR = 50% and 1800 rpm. The high-pressure cylinder performance can also be improved with an appropriate introduction of the isochoric combustion, but its impact on the whole DCEE setup needs further investigation.

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Effect of fuel temperature on the methanol spray and nozzle internal flow

Cited by 26 publications

References 37 publications

Numerical simulation of the influence of fuel temperature and injection parameters on biodiesel spray characteristics

Numerical simulation of the influence of fuel temperature and injection parameters on biodiesel spray characteristics

An experimental study on the effect of inlet diesel fuel temperature on mass flow choking, flame penetration, temperature, radiative characteristics and NOx pollutant emission of an oil burner

Numerical investigation of the effect of injection strategy on a high-pressure isobaric combustion engine

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