Combustion Characteristics Of Diesel Engine Research Articles

Optimization Evaluation of Various Type Nanoparticles - Diesel Blended Fuels on Diesel Engine Combustion Characteristics, Performances and Exhaust Emissions

Optimization Evaluation of Various Type Nanoparticles - Diesel Blended Fuels on Diesel Engine Combustion Characteristics, Performances and Exhaust Emissions

Effect of Diglyme on the performance, emission and combustion characteristics of diesel engine fuelled with methyl ester of rubber seed oil

The present study analyses the effect of oxygenated additive Diglyme on engine performance, emission and combustion characteristics of a compression ignition engine fuelled with Rubber Seed Oil Methyl Ester blend. The biodiesel prepared through transesterification process has properties as per ASTM standards. Results show that the addition of Diglyme improves the Brake Thermal Efficiency and reduces Brake Specific Fuel Consumption. The oxygenated additive Diglyme was found to be efficient in the reduction of CO, HC and smoke emissions with the penalty of NOx. The % increase in BTE and NOx found to be 4.01 and 1.38, respectively for 15% Diglyme blend of biodiesel. The % decrease in BSFC, CO, HC and smoke emissions was observed to be 14.3, 29.7, 56.9 and 9.2, respectively. Combustion parameters, such as cylinder pressure, Heat Release Rate, Mass Fraction Burnt, Cumulative Heat Release Rate and mean gas temperature, have been analysed for the fuel blends.

Effect of Oxygenated Functional Groups in Essential Oils on Diesel Engine Performance, Emissions, and Combustion Characteristics

Waste management cost for Australia is increasing every year, and thus, it is important to find alternative ways to use the waste. For example, essential oil has a significant waste stream that can be utilized in vehicles of their producers. However, some of the essential oils contain oxygen which considerably affects engine performance, emission, and combustion characteristics of diesel engines. Thus, this research paper will try to evaluate the essential oils as a replacement of diesel fuel to operate a multicylider diesel engine. For this study, two essential oils are selected which contain different oxygenated functional groups, tea tree oil (5.4% oxygen) and eucalyptus oil (8.4% oxygen), with an aim to evaluate the effect of these functional groups on engine performance and emission parameters. These oils were blended with neat diesel (0% oxygen) to obtain a blend cotaining 2.2% oxygen by weight. The blends produced similar brake power; however, brake-specific fuel consumption (BSFC) increased for eucalyptus oil blends (2.4–3.7%) and tea tree oil blends (3.9–5.3%). Essential oil–diesel blends resulted in less CO and increased NOX emission, produced similar peak pressure, and indicated mean effective pressure. The results then lead to the conclusion that oxygenated essential oils can have a role to reduce dependency of agricultural sector on diesel in the near future.

A study on performance, emission and combustion characteristics of diesel engine powered by nano-emulsion of waste orange peel oil biodiesel

The current work aims at assessing the single cylinder, diesel engine fueled with nano-emulsion of orange peel oil biodiesel. The orange oil was elicited from orange peels through solvent extraction method then converted into methyl ester. By using the solvent extraction method, the orange peel oil (Limonene) yield was achieved up to 82.3%. Later, nanofluid was prepared in two different concentrations by doping 50 and 100 ppm of TiO2 nanoparticles. The orange oil biodiesel nano-emulsions namely OOME-T50 and OOME-T100 were prepared with the proportion of 88% of pure orange oil methyl ester, 10% of TiO2 nanofluid and 2% of span-80 as a surfactant. Experiments were performed with prepared fuels (pure OOME, OOME-T50 and OOME-T100) in a test engine and its results were discussed. The BTE of the engine increased up to 1.4% and 3.0% with OOME OOME-T50 and OOME-T100 fuels when correlated with pure OOME fuel. However, neat diesel fuel indicates maximum BTE at peak load condition. Significant reduction of about 24.2%, 9.7%, 18.4%, 16.0% in smoke, NOx, CO and HC were observed for OOME-T100 nano-emulsion fuel as correlated to pure OOME at peak load. Also, it can be noted that the cylinder peak pressure and heat release rate were increased for OOME nano-emulsion fuels when compared to pure OOME at greatest power output.

Misfire fault diagnosis of diesel engine based on VMD and XWT

For diesel engine misfire fault diagnosis under strong noise, a new method based on variational mode decomposition (VMD) and cross wavelet transform (XWT) is proposed. Firstly, the vibration signal of cylinder head is processed by stages according to the working cycle of diesel engine, and then the vibration signal of each working cycle is re-sampled according to the same angle. Then the vibration signal of cylinder head is decomposed by VMD to denoise adaptively and reconstruct the signal. Next, XWT is used to analyze the time-frequency correlation of any two continuous working cycle signals, and the non-periodic components and random noise in the vibration signals are further eliminated to extract the combustion characteristics of diesel engines. Finally, the misfire fault of diesel engine is diagnosed by calculating the energy proportion of each cylinder in time-frequency space. The effectiveness of the proposed method is verified by simulation and experiment.

Effect of EUP Injection Parameters on the Combustion Characteristics of Diesel Engine

With the increasingly stringent requirements for energy conservation and emission re-duction of diesel engine, electronic control of diesel fuel injection system is necessary. EUP (elec-tronic unit pump) can precisely control the fuel injection process which can reduce the exhaust emission and fuel consumption effectively. In this paper a EUP diesel engine is used as the research object. Through the combination of simulation and experiment, the effect of injector diameter and injection timing on the combustion of the engine is studied. The results show that the above param-eters have an important effect on the gas mixture formation and combustion process of the diesel engine in the cylinder. By selecting the appropriate parameters, the optimized diesel engine can meet the non-road national stage III emission regulation.

Energy, exergy, performance, emission and combustion characteristics of diesel engine using new series of non-edible biodiesels

This study investigated the impact of the addition of a novel series of biodiesels on diesel engine performance, emissions and combustion characteristics. Two non-edible biodiesels, namely waste cooking oil and macadamia oil (Macadamia integrifolia) biodiesels were experimentally tested in this study. The fuel blends were prepared in such a way that the fuel oxygen remains at 3.35 wt% in the blend. A 4-stroke, 4-cylinder, naturally aspirated diesel engine was used for all experiments. The engine was coupled and loaded with an eddy current dynamometer. The experimental results indicated that compared to diesel, all diesel-biodiesel blends show no significant changes in engine performance, but higher combustion efficiency and significant reductions in all major diesel emissions with a little penalty of NOx emission. Fuel energy and exergys were almost unchanged or slightly lower than diesel.

Modelling and simulation of performance and combustion characteristics of diesel engine

The main objective of this study was to develop a thermodynamic model to analyse engine performance and combustion behavior of a single cylinder, four-stroke, naturally aspirated, direct injection (DI) diesel engine. The model was developed with a commercial GT-Power software. Various sub-models for different systems including intake, exhaust, fuel injection, combustion, and heat transfer rate were combined for thermodynamic analysis of engine performance and combustion behaviour. The engine rotational speed, start of injection timing and compression ratio were considered as variables. The engine rotational speeds were varied from 800 rpm to 2500 rpm, the start of injection timings was ranged from 15o crank angle (CA) before top dead centre (bTDC) to 15o CA after top dead centre (aTDC), and the compression ratios were changed from 13 to 25. Performance parameters such as indicated and brake power, brake thermal efficiency, friction, etc. and combustion parameters such as heat transfer rate and in-cylinder pressure are analysed at different engine rotational speed, injection timing, and compression ratio, and discussed accordingly. The optimum performance such as BTE, BT and BMEP were found at the engine speed of 1700 rpm, a start of injection timing of 10o bTDC, and a compression ratio of 20

Combined impact of EGR and injection pressure in performance improvement and NOx control of a DI diesel engine powered with tamarind seed biodiesel blend.

In the process of creating eco-friendly environment and conserving fossil fuels for the future generations, biodiesel has been chosen as a good substitute for diesel. It is a proven fact that biodiesel operated diesel engine can deliver comparable results with diesel. The present work focuses on TSME20 (tamarind seed methyl ester 20% + diesel 80%) as a renewable fuel, and its performance and emission results are analyzed at different exhaust gas recirculation rates and various injection pressures. The process is done in two stages. Firstly, experiments are conducted on TSME20 operated diesel engine at three injection pressures (180, 200, and 220bar), and the results are analyzed. From the experimental results, improved efficiency by 2.29% and reduced emissions, such as hydrocarbon, smoke, and carbon monoxide, by 53.84, 56.25, and 75.15% are observed at the peak load for the increased injection pressure (220bar) over 200bar except NOx levels, which are found high by 11% compared to 200-bar injection pressure. Secondly, tests are again performed at the optimal condition of 220-bar injection pressure with the exhaust gas re-circulation (EGR) rates at different levels, i.e., 10 and 20%. The test results reveal that the addition of 10% EGR to the engine operating at 220bar counteracts the release of NOx levels, which are found reduced by 80.5% over standard conditions without much compromise in engine performance. Also, the combustion characteristics of diesel engine at 220-bar fuel injection pressure of tamarind biodiesel blend showed enhancement when compared to other fuel injection pressures.

Comparative investigation of the effect of hemispherical and toroidal piston bowl geometries on diesel engine combustion characteristics

Diesel engine parameters are in general more compatible with operating on neat diesel than biodiesel and its blends. Therefore, optimizing operating conditions as well as piston bowl geometry to achieve a better performance with biodiesel in conventional diesel engines is highly essential. In the present study, hemispherical piston bowl geometry (HPBG) of existing diesel engine was modified into toroidal piston bowl geometry (TPBG) to evaluate the performance of a diesel engine running on a 20% blend of dairy scum oil biodiesel (B20). The experimental results revealed increased brake thermal efficiency and heat release rate by 5.5% and 17.24%, respectively, while brake specific fuel consumption, HC emission, and CO emission were decreased by 8.75%, 15%, and 14.47%, respectively, in response to the engine modification applied. Such improvements using the TPBG could be attributed to improved fuel atomization, reduction of fuel droplet size, increased cylinder temperature, enhanced squish-swirl, and turbulence kinetic energy during combustion. The findings of the present study could pave the way for the fabrication of diesel engines, which are more efficiently compatible with biodiesel and its blends.

Impact of compression ratio analysis in waste cooking oil biodiesels–diesel blends as fuel

ABSTRACT The objective of this study is to investigate the effect of compression ratio on combustion characteristics of diesel engine with waste cooking oils methyl ester–diesel blends as fuel. The DI engine fuelled with Waste Cooking Rice Bran Methyl Ester (WCRBME) and Waste Cooking Cotton Seed Oil Methyl Ester (WCCSME) prepared by the transesterification process was investigated for its combustion and then compared with petroleum-based diesel fuel (PBDF). Experiments were conducted at a constant speed of 1500 rpm and maintained at a full-load condition for the compression ratio of 17:1, 18:1 and 19:1 and blending ratios B20, B40, B60 and B80.The fuel properties were strictly measured as per ASTM testing methods and these observed properties are verified to be well within the limits of ASTM D 6751 biodiesel standards. The combustion characteristics of heat release rate and combustion pressure of WCRBME & WCCSME were found closer to diesel.

Effect of Injection timing on diesel engine performance, combustion and emission characteristics operated with Dairy Scum Biodiesel

Treating of dairy waste scum into fuel will be the very beneficial for milk dairies in terms of energy savings, reduction of hazardous emissions and independency on foreign fuels. This new approach of developing and utilization of dairy scum oil methyl ester is highly pronounced in the field of alternative fuels for diesel engines. In the present study experimental work attempts to unfold the influence of DSOME blends and injection timing (IT) on the performance, emission and combustion characteristics of diesel engine. In the first phase of experimental work effect of different blends namely DSOME-B10, DSOME-B20, DSOME-B30 and DSOME-B100 are studied and compared with petroleum diesel. In second phase of experimental work different injection timings namely 20.deg.bTDC, 23.deg.bTDC, 26.deg.bTDC and 29.deg.bTDC are studied and compared with standard engine. From first phase of experimental works its revealed that significant improvement of brake thermal efficiency, brake specific fuel consumption and reduced HC, CO emissions are observed for DSOME-B20 blend hence it is optimized and carried to the second phase of the work to optimize the injection timing. From second phase of experimental results it is concluded that 26.deg.bTDC IT for DSOME-B20 operation shown the improved performance, combustion and emission characteristics among other ITs hence it is optimized for DSOME-B20 fuel blend.

Effects of the Combustion Characteristics of Diesel Engine by the Intake of Exhaust Gas from Gas Engine

Effects of the Combustion Characteristics of Diesel Engine by the Intake of Exhaust Gas from Gas Engine

Assessment of n-pentanol/Calophyllum inophyllum/diesel blends on the performance, emission, and combustion characteristics of a constant-speed variable compression ratio direct injection diesel engine.

Alcohol is used as an additive for a long time with the petroleum-based fuels. In this study, the higher alcohol, n-pentanol, was used as an additive to Calophyllum inophyllum (CI) biodiesel/diesel blends at 10, 15, and 20% by volume. In all blends, the ratio of CI was maintained at 20% by volume. The engine characteristics of the pentanol fuel blends were compared with the diesel and CI20 (Calophyllum inophyllum 20% and diesel 80%) biodiesel blend. The nitrogen oxide (NO) emission of the pentanol fuel blends showed an increased value than CI20 and neat diesel fuel. The carbon dioxide (CO2) also increased with increase in pentanol addition with the fuel blends than CI20 fuel blend and diesel. The carbon monoxide (CO) and hydrocarbon (HC) emissions were decreased with increase in pentanol proportion in the blend than the CI20 fuel and diesel. The smoke emission was reduced and the combustion characteristics of the engine were also improved by using pentanol blended fuels. From this investigation, it is suggested that 20% pentanol addition with the biodiesel/diesel fuel is suitable for improved performance and combustion characteristics of a diesel engine without any engine modifications, whereas CO2 and NO emissions increased with addition of pentanol due to effective combustion.

Combustion Characteristic of Diesel Engine Fueled by Biodiesel at Partial Load

This paper investigated the performance and combustion characteristics of diesel engine fueled by biodiesel at partial load conditions. Experiments were made on a common-rail fuel injection diesel engine using mineral diesel and blends (6% and 10%) with biodiesel obtained from peanut oil and waste oil under various loads. The results shows that blend fuels have a significant impact on the engine’s brake specific fuel consumption (BSFC) and brake thermal efficiency (BTE) at partial load conditions. The BSFC increase for blends with the decrease of engine load. For BTE, the results show that the use of biodiesel results in a reduced thermal efficiency at lower engine loads and improved thermal efficiency at higher engine loads.

Influence of Exhaust Gas Recirculation on Combustion and Emission Characteristics of Diesel Engine Fuelled with 100% Waste Cooking Oil Methyl Ester

The present research work deals with the application of 30% exhaust gas recirculation (EGR) in a direct injection compression ignition engine fuelled with 100% waste cooking oil methyl ester and conventional diesel. In the first phase of this research work, the performance, emission and combustion characteristics of diesel engine are investigated with the supply of fresh air–fuel mixture for conventional diesel and waste cooking oil methyl ester as fuels and in the second phase the fresh air–fuel mixture is blended with 30% exhaust gas. The study reveals that the 30% EGR addition decreased the brake thermal efficiency by 8 and 18% for conventional diesel and 100% waste cooking oil methyl ester as fuels. Nitrogen oxides emission is reduced to a great extent by 47.5% for diesel fuel and 58.9% for biodiesel fuel at full load condition. Further, the 30% EGR has substantially increased the carbon monoxide and unburnt hydrocarbon emissions for both the fuels at maximum brake mean effective pressure. In addition similar pattern of in-cylinder gas pressure, heat release rate, cumulative heat rate have been observed for fresh air fuel mixture and 30% EGR under various loading conditions.

Effect of piston bowl geometry and different injection pressure on the performance, emission and combustion characteristics of diesel engine using biodiesel blend

The shape of the piston cavity, variable injection pressure and variable compression ratio are main input parameters to give better atomization of fuels and high swirling induction that improves the Diesel engine performance, combustion, and emissions characteristics. In this study, the engine test was carried out to improve the combustion, performance, and emissions with the use of two different pistons namely hemispherical shaped piston (standard engine), and toroidal cavity piston with varied injection pressures in a single-cylinder direct injection Diesel engine using 25% of corn oil methyl ester-diesel blend (COME25). Initially, the piston bowl was modified to toroidal combustion chamber with tangential cut on circumference of the piston crown in a standard piston of hemispherical type combustion chamber. The engine speed, compression ratio, and injection timing were kept constant and the results of toroidal combustion chamber compared with base engine piston of hemispherical combustion chamber using diesel and COME25 fuel. The results showed that the toroidal combustion chamber has improved performance, combustion and emissions with the exception of NOx emissions.

EFFECT OF HYDROGEN ADDITION AT DIFFERENT LEVELS ON EMISSIONS AND PERFORMANCE OF A DIESEL ENGINE

The ratio of diesel vehicles in vehicle park and also the number of diesel vehicles sharply increase in the world. Advantages of diesel engines can be stated as high efficiency, low fuel consumption etc., on the other hand high amount of oxides of nitrogen caused by high compression ratio of diesel engines should be noted as its disadvantage. Moreover, a high amount of smoke emission is formed due to combustion characteristics of diesel engines. Both NOx and smoke are really hazardous for the environment. Stringent emission regulations force diesel engines to exhaust less NO x and smoke emissions. Thus, diesel engines require advanced after - treatment systems. The catalyst materials in after - treatment systems are really expensive. In this study, different levels of hydrogen [0%, 40% and 75%] on energy basis of total fuel were introduced into intake manifold of engine. Brake thermal efficiency of the engine improved with increasing percentage of hydrogen. CO, THC and smoke emissions are significantly decreased by using hydrogen as additional fuel. Especially, a novel decrease on smoke emission [up to 70.7%] is obtained. However, particularly during 75% hydrogen addition, the dramatic increase in NO x emissions could not be prevented.

Cylinder Pressure Cyclic Variations in a Diesel Engine operating with Biodiesel-Alcohol Blends

Biofuels include biodiesel and alcohols are considered sustainable replacements for fossilized fuels due to their higher oxygenated content with superior combustion characteristics. However, the combustion characteristics for biofuels are not fully understood and require more research works to investigate how the biofuels characterize. Therefore, the aim of this paper is to investigate the cyclic variations of the cylinder pressure in the single cylinder diesel engine operating with biodiesel-alcohol (BBu10 and BE10) blends with palm biodiesel (B100) and mineral diesel (B0) as the baseline fuels. These test fuels are tested at full engine load under a constant engine speed of 2300 rpm. The engine combustion characteristics were examined using cyclic variations of combustion pressure and indicated mean effective pressure (IMEP) at 200 cycles. Statistical analysis of combustion characteristics of diesel engine has been carried out over two different engine load and speed. The results of this study demonstrate that the cyclic variations of combustion characteristics of BE10 are very high. The results also showed that presented that the engine operating with B100 and BBu10 tend to be very stable as compared to mineral diesel using COVIMEP. It can be concluded from the study that alcohols contribute a significant effect on the higher engine cyclic variation that related to engine combustion characteristics.

Influence of injection timing and split injection strategies on performance, emissions, and combustion characteristics of diesel engine fueled with biodiesel blended fuels

Biodiesel can be used as alternative to replace fossil diesel. However, usage of biodiesel in an unmodified diesel engine can cause higher in nitrogen oxides (NOx) emission. In order to reduce the harmful emission, certain injection strategies can be carried out. In this paper, the effects of biodiesel blends, fuel injection timing and split injection schemes on the engine performance, emissions and combustion characteristics of a medium-duty diesel engine are investigated. Parametric studies relating with start of injection timing variation and multiple injection schemes using B20 and B50 biodiesel blends were performed and benchmarked with petroleum diesel fuel as baseline. A remarkably lower NOx level below 100 ppm can be obtained by retard start of injection (SOI) timing for both of the B20 and B50 fuel operations and with triple injection scheme. It was found that with the use of B50, simultaneous NOx and smoke suppression from the levels of petroleum diesel fuel is attainable in parallel with the implementation of late SOI timing and triple injection scheme in a diesel engine. In conclusion, multiple split injections is a practical strategies to simultaneously decrease NOx and smoke emissions when the SOI timing is fine-tuned and is an ideal alternative to operate with biodiesel fuel.