Papers by Keyword: Diesel Engine

Abstract: Humanity has been compelled to contemplate numerous alternative fuels because of the ever-increasing demand and cost of petroleum-based products. Numerous experimental studies on alternative fuels in diesel engines have been conducted in order to decrease emissions and improve performance of CI diesel engines. A major respondent in the alternative fuels industry at the moment is bio-diesel, which can be employed in any diesel engine. The use of nanoadditives to diesel-biodiesel fuel mixes has further shown notable outcomes. They improved the qualities of biofuel, which resulted in better efficiency and a significant drop in emissions. The emphasis of the current work is on the impact of bio-diesel nanoadditions on efficiency and emission levels of CI engines. The paper aims to review the use of metal oxide nanoadditives and the growing utilization of hybrid nanoadditives. nanoadditives like Al₂O₃, CeO₂, graphene oxide, TiO₂ and recent works in hybrid additives have been discussed. It is found that emissions of carbon dioxide, hydrocarbon and carbon monoxide have been significantly decreased, which allowed diesel engines to operate at their full potential.

Abstract: Fretting wear primarily impacts the bushing of the con-rod, subsequently influencing the con-rod's overall performance. In this investigation, the contact interactions between the con-rod small end, the small end cover, and the bushing under conditions of utmost combustion pressure were investigated. This analysis included examining the contact pressure and friction stress distribution. Subsequently, an orthogonal simulation test was developed to further investigate these interactions. The study took into account the friction coefficient of the interface and the quantity of interference as test factors based on contact mechanics theory. The objective functions were the utmost friction stress and contact pressure, ascertained under conditions of peak combustion pressure. Based on the findings from this study, the contact pressure of the top portion of the bushing is lower than that of the bottom portion. The friction stress of the top portion of the bushing is larger than that of the bottom portion. The optimal values for the interference amount and friction coefficient are 0.11 and 0.15, respectively, which will result in the most favorable conditions for minimizing fretting wear in the bushing.

Abstract: This article presents a model based on the analysis of the results of performing mathematical experiments and checking the adequacy of the results based on the mathematical model developed in the "MatLab" language using the existing methodology for calculating the duty cycle of the main and auxiliary ship diesel. The creation of such a model allows to analyze the processes that may occur in the working cycle without wasting time and materials, to predict in advance the effect of parameters on the efficiency of the engine.

Abstract: The tremendous exhaustion of resources, a surprising price increase of petroleum fuel and worldwide ecological issues implement to find renewable fuel for compression ignition engine. Non-edible vegetable oils have proven consensus to opt as a replacement for diesel fuel due to comparable properties and less-pollutant characteristics. Using Unmixed Untreated Non-edible Vegetable Oil (UUNVO) in the CI engine matches the needs of a sustainable future and restricts the intensifying cost involved in biodiesel production. This paper aims to review the influence of various UUNVO (Karanja, Jatropha, Neem, Linseed, Mahua and Rubber Seed etc.) on the important performance parameters and emission level of diesel engine. UUNVO can be fuelled to the unmodified CI engine. However, the viscosity of UUNVO is reasonably higher compare to diesel fuel at room temperature, which deteriorates the engine performance and exhaust emission. Minor changes in the injection line for preheating the UUNVO and operating parameters are the way to improve it. It can clearly understand here that preheated UUNVOs typically increase NO_x emissions and decrease PM, HC, and CO emissions level compared to standard diesel. UUNVO can substitute diesel fuel completely for short-duration operation. With the long-duration operation, UUNVO produces problems like poor engine performance, injector chocking, and erosion of piston crown, rings, cylinder liner, and other internal parts, and degradation of the lubricant. Problems raised due to durability can be minimized by controlling operational parameters.

Abstract: The Cu-MOF has outstanding catalytic activity because of its capacity to buffer oxygen. As a result, when added to diesel fuel, this additive reduces nitrogen dioxide emissions while also oxidising hydrocarbon emissions. The current study examines the impact of Cu-MOF nanoparticles on diesel engine efficiency and emissions. The SEM, and XRD methods were utilised to characterise the nanoparticles of Cu-MOF, which were generated by chemical approach. In a two-step method, Cu-MOF was combined with diesel using a conventional ultrasonic shaker in order to get a stable suspension, Extensive experiments using ASTM-standard testing procedures have also examined the impact of nanoparticles on several physicochemical parameters of diesel fuel. For the purpose of examining the impact of nanoparticles on engine efficiency and emissions, a diesel engine load test was conducted. Also included are side-by-side comparisons of fuel qualities with and without additives.

Abstract: The objective of this paper is to investigate the fuel injection system in diesel engines by using inline pumps. In a diesel engines, the fuel injection pressure plays an important role in the combustion process in order to obtain high performance and low fuel consumption. The experiments in this paper are been performed on a 6 cylinder inline pump which is actioned by an electric motor with variable r.p.m.-s The quantity of the fuel injected by each injector is measured function of time and the speed of electric motor. The experiments show the degree of non-uniformity of the fuel delivered by the pump to injectors.

Abstract: Biodiesel fuel is biodegradable, Sulphur free, non-toxic and environmentally friendly. Current research focuses on coconut biodiesel production using crude coconut oil. Both one and two step transesterification methods were utilized to analyze the effect of free fatty acid on the transesterification process while the two-step transesterification reported highest yield biodiesel percentage of 84% compared to the one step i.e. 72%. The fuel properties found compatible with standards. The biodiesel blends fueled diesel engine performance tests were performed on diesel engine Water-cooled, four stroke, single cylinder, Direct Injection System (Kubota - RK95-1-NB-RDK). The biofuel blend with 10% of coconut biodiesel and 90% Petro-diesel shown the highest brake horsepower of 8.809KW, engine power of 1.685KW and mechanical efficiency of 15.24%. While in exhaust gas emission analysis, the hydrocarbon and carbon monoxide decrease with the increasing biodiesel blend whereas the nitrogen oxides increased.

Abstract: In recent years, diesel engine is developing rapidly in the direction of high power and super long stroke, which requires higher strength of its key moving parts. Connecting rod is one of the key moving parts of diesel engine which is subjected to complex alternating load during the working process. This loading condition has a great influence on its structural strength and reliability. In the proposed study, the strength and fatigue of a low-speed diesel engine con-rod made of 42CrMoA are analyzed. The 3-D model of the con-rod assembly built in the proposed study. The stress distribution and deformation of the con-rod assembly under the maximum explosive pressure are presented and studied. In the present paper, fatigue safety factor of all parts of con-rod assembly under the maximum explosive pressure condition is checked. According to the results carried out from the proposed work, the corresponding alternating stress is 340MPa, while the fatigue limit of 42CrMo material is above 430-540MPa, which means that the con-rod parts work under the alternating stress far below the fatigue limit. The kirasushvili method is adopted in the present paper as the standard of safety factor evaluation of con-rod. According to the allowable safety factor table of kirasushvili method, the minimum safety factor of the big and small ends of the con-rod and rod body can meet the requirements without fatigue damage.

Abstract: This paper presents a study on improvement of performance characteristics of small diesel direct injection engine with power of 16.5HP using the re-design of intake manifold. With help of simulation tools like AVL BOOST, the proposed measures for improvement of intake manifold were analyzed. The simulation results indicated that two best intake manifolds were recommended for experimental purposes. These manifolds were experimentally used to benchmark to the current intake manifold of engine. In experiments, the important performance characteristics of engine (like volumetric efficiency, brake power, brake torque, fuel consumption, NOx, Soot, and CO) were analyzed. Moreover, the flow pattern of intake air was experimentally observed using a transparent cylinder.

Abstract: In this present investigation titanium dioxide (TiO₂) nano-fluid was blended with aphanizomenon flos (AF) biodiesel (20%)-diesel (80%) blend. Different percentages of TiO₂ such as 5%, 10%, and 15%, was added with AF-D (aphanizomenon flos-diesel) blends. The blends are named as AFD-5TiO₂, AFD-10TiO₂, and AFD-15TiO₂. The performance and emission parameters of a single cylinder CI engine fueled with AFD-TiO₂ blends were experimentally investigated. The results reveal that, with the use of TiO₂ nano particles, AFD-10TiO₂ blend gave optimum results. BSFC decreased by about 5% and BTE increased by about 2% with the addition of TiO₂ nano-particle as a catalyst. The tailpipe emissions such as CO, HC, smoke reduced drastically, but the NO emission increased, with the use of TiO₂ nano-particles.