A comparative study on the usage of fusel oil and reference fuels in an HCCI engine at different compression ratios

Combustion and emissions of a diesel engine utilizing novel intake manifold designs and running on alternative fuels

\n The aim of this research is to investigate the influences of apex seal leakage on the formation mechanism of flow field in a side-ported rotary engine by particle image velocimetry (PIV) and computational fluid dynamics (CFD). In this study, a PIV was used to acquire the two-dimensional (2D) flow field on the rotor housing central plane at an engine speed of 700 rpm. A three-dimensional (3D) dynamic simulation model considering leakage through apex seals was established and verified by the 2D-PIV experiment results. Thereafter, CFD analysis was used to further understand the 3D flow field in combustion chamber under the action of apex seal leakage. The simulation results showed that for the three engine speeds (2000, 3500, and 5000 rpm), in the intake stroke, the vortex generated in the front end of combustion chamber under the condition with no leakage, was strengthened and destroyed by the effects of the small (0.02 mm) and the large (0.08 mm) apex seal leakage gaps, respectively. As the apex seal leakage gap increased, the volume efficiency and the peak pressure decreased continuously. The volume efficiency and the peak pressure caused by any fixed apex seal leakage gap decreased with the increase of the engine speed. Compared with the volumetric efficiency of the condition with no leakage at 2000 and 5000 rpm, the volumetric efficiency of apex seal leakage gap of 0.08 mm decreased only by 24.6% at 5000 rpm, but by 41.2% at 2000 rpm.

Experimental and Numerical Study on the Formation Mechanism of Flow Field in a Side-Ported Rotary Engine Considering Apex Seal Leakage

The quantity of energy consumers in the country is extensive in the current quick-moving situation; the whole car industry puts a significant part in energy utilization. Biofuels have lured consideration among other alternative fuels as indicated by their natural element and synthetic creation.In this test, the aluminum nanoparticles are prepared by three various proportions (50, 100 and 150 ppm) being used in the base engine. To introduced thermal barrier coated engine in piston top face and the desired thickness is 500 μm with the assistance ofmethods using plasma spray and coated with PSZ material. A diesel engine is tested with 100% Borassus flabellifer, 20% Borassus flabellifer +75% mineral fuel +5% content of water and 20% Borassus flabellifer+75% mineral fuel+5% content of water + Al2O3 (50 ppm), 20% Borassus flabellifer +75% mineral fuel +5% content of water + Al2O3 (100 ppm) and 20% Borassus flabellifer+75% mineral fuel+5% content of water + Al2O3 (150 ppm),. The blend BFNP 150 shows an higher in break thermal efficiency by 5.12% when correlated with diesel fuel. The hydrocarbon, carbon monoxide, and opacity of the blend BFNP150 decreased by 22.42%, 31.98%, and 25.12% compared with the diesel fuel. Oxides of nitrogen are increased by 11.24% in the BFNP 150 blends when compared to basefuel.To use the biofuel, the oxides of nitrogen are increased to reduce the NOx the water content is adopted into the fuel with the surfactant’s help. Most of the research the Span 80 and Tween 80 was used as surfactant due to the high HLB value, and stability of the emission is withstanding for long times.

Investigation on the mitigation of environmental harmful emissions by incorporating nanoparticles to biofuel water nano emulsion in low heat rejection engine

The depletion of fossil fuels as a result of excessive use and increased environmental pollution brought up the research of environmentally conscious and renewable alternative fuels. The alternative fuel to be considered for internal combustion engines should not decrease the performance of the engine too much and positively affect the exhaust emissions. It is also important that this fuel should provide some specifications such as easy producibility, low cost, availability and usability in internal combustion engine without modification. Low temperature combustion modes are promising technologies providing nearly zero NOx and soot emissions and currently a lot of researcher has focused on this technology. In this experimental study naphtha was tested in an HCCI engine. In order to examine and understand the effects of the naphtha on HCCI mode a comparison study was also conducted by using RON68. Maximum imep was computed as 3.23 and 3.32 bar with RON68 and naphtha respectively at λ=1.7. SOC was determined 5.4 °CA and 5.76 °CA ATDC with naphtha and RON68 at λ=2. CA50 is far away from TDC fact that net work decreases. Maximum ITE was calculated as 45.42% and 46.07% at λ=2 with RON68 and naphtha respectively.

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A Comparative Study on the Usage of RON68 and Naphtha in an HCCI Engine

New induction manifold designs have been developed in this work to enhance the turbulence intensity and improve the mixing quality inside diesel engine cylinders. These new designs employ a spiral-helical shape with three different helical diameters (1D, 2D, 3D; where D is the inner diameter of the manifold) and three port outlet angles: 0 deg, 30 deg, and 60 deg. The new manifolds have been manufactured using three-dimensional printing technique. Computational fluid dynamics simulations have been conducted to estimate the turbulent kinetic energy (TKE) and the induction swirl generated by these new designs. The combustion characteristics that include the maximum pressure raise rate (dP/dθ) and the peak pressure inside the cylinder have been measured for a direct injection (DI) diesel engine utilizing these new manifold designs. In addition, engine performance and emissions have also been evaluated and compared with those of the normal manifold of the engine. It was found that the new manifolds with 1D helical diameter produce a high TKE and a reasonably strong induction swirl, while the ones with 2D and 3D generate lower TKEs and higher induction swirls than those of 1D. Therefore, dP/dθ and peak pressure were the highest with manifolds 1D, in particular manifold m (D, 30). Moreover, this manifold has provided the lowest fuel consumption with the engine load by about 28% reduction in comparison with the normal manifold. For engine emissions, m (D, 30) manifold has generated the lowest CO, SO2, and smoke emissions compared with the normal and other new manifolds as well, while the NO emission was the highest with this manifold.

Investigating the Effect of Utilizing New Induction Manifold Designs on the Combustion Characteristics and Emissions of a Direct Injection Diesel Engine

New Induction Manifold Designs for High Performance and Low Emission Diesel Engine Running on Alternative Fuels

This work has conducted a numerical study using AVL‐Boost engine simulation utilizing biogas (CH4 and CO2)–air mixtures in a SI engine model. The effect of varying the air manifold temperature from 25 to 50°C on the combustion characteristics as well as engine performance under full load condition in a SI engine fueled by gasoline and biogas mixtures has been investigated. The performed tests involved using variable concentrations of CO2 from 10% to 40% by volume. The current model has been validated with experimental results and it was found that the error in predicting the P‐θ behavior of the engine is about 4.89%. The results showed that, as the air inlet temperature increases, the volumetric efficiency decreases and the brake specific fuel consumption (BSFC) increases for gasoline and all biogas compositions. However, the peak pressure, brake output power, maximum pressure rise rate, and maximum heat release rate were decreased slightly with the increase in air inlet temperature. The effect was only observed for gasoline and the 10%‐CO2 biogas, whereas the effect on the maximum heat release rate was detected on gasoline and biogas compositions up to 20%‐CO2 only. On the other hand, the existence and growth of CO2 content in the biogas reduced significantly the peak pressure, brake output power, maximum pressure rise rate, volumetric efficiency, and both net and maximum heat release rates, though its effect in reducing the volumetric efficiency stopped at 20%‐CO2 biogas. Furthermore, BSFC rises noticeably with the increase in CO2 ratio in biogas. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

Investigating the effect of the air inlet temperature on the combustion characteristics of a spark ignition engine fueled by biogas

I. IntroductionGas to Liquids (GTL) is one of clean alternative fuels which loosely defined terms that is generally used to describe the chemical conversion of natural gas to some type of liquid products. As such, it excludes the production of liquefied natural gas (LNG), but includes the conversion of gas to methanol, liquid fuels, and petrochemicals, being the most common applications. In other words, Gas to liquids (GTL) technology is used to convert a carbon containing feedstock such as natural gas, to synthetic diesel fuels and further developed by oil companies. Fewer studies investigated the use of GTL diesel with the existing diesel engines to study the effect of using this new alternative fuel on the efficiency and emissions in these engines. Hence, the objectives of this study are to investigate the behavior of the GTL – diesel fuel blends in context of different combustion characteristics, engine performance and emissions. It is expected that the outcomes of this study will shed further light o...

Mohamed A. Bassiony

Papers

Combustion and emissions of a diesel engine utilizing novel intake manifold designs and running on alternative fuels

Investigating the Effect of Utilizing New Induction Manifold Designs on the Combustion Characteristics and Emissions of a Direct Injection Diesel Engine

New Induction Manifold Designs for High Performance and Low Emission Diesel Engine Running on Alternative Fuels

Investigating the effect of the air inlet temperature on the combustion characteristics of a spark ignition engine fueled by biogas

Combustion Characteristics and Emissions of a Direct-Injection Diesel Engine Fueled with GTL Fuel Blends