Combustion Analysis of CI Engine under the Influence of two different Injecting Nozzles (original) (raw)
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Performance & Emission Analysis of CI Engine under the Influence of two different Injecting Nozzles
The performance of any engine can be determined by the efficiencies of engine. The research work in the field of performance includes the calculation and analysis of efficiencies and fuel consumption. The overall idea about the performance can be achieved by conducting the experiment. Moreover the study regarding the nozzle is also integrated in the research so that the main working principle and design of nozzle can be studied in detailed. Also the pollution is a major problem in today's life so this paper also includes the study and analysis regarding the exhaust gas emission created by the vehicles on road. Thus the integration of performance and emission study gives the perfect idea about the actual CI engine.
COMBUSTION PHENOMENON IN CI ENGINE: A REVIEW
The basic concept of internal combustion engine is a cylinder, which is closed at one end, is filled with a mixture of fuel and air. As the crankshaft turns it pushes cylinder. The piston is forced up and compresses the mixture in the top of the cylinder. The mixture is set alight and, as it burns, it creates a gas .pressure on the piston, forcing it down the cylinder. This paper gives a review of compression ignition engine.
The paper discusses the results of research on the influence of the strategies of fuel dose division on the engine operational and optical indexes and the combustion process. The paper also contains an exhaust gas analysis conducted with the use of a Rapid Compression Machine. The recorded images related to the period from the onset of the injection to the beginning of the appearance of combustion spots have also been analyzed. The following have been varied: number of doses, size of doses, dwell times and excess air coefficient. The authors performed a comparative analysis of the thermodynamic indexes of the combustion process obtained from the indicator tracings. Introduction Technological advancement in combustion systems of diesel engines triggers the need of fulfilling many contradictory requirements. Among those are such issues as maintenance of environmental standards in terms of the exhaust emissions with a simultaneous preservation of the thermodynamic properties of the com...
Alexandria Engineering Journal, 2022
Engine properties such as engine speed and fuel injection quantity may affect the swirl flow of diesel engines. In this paper, experiments are conducted at two engine rpm and various operation conditions. For instance, motoring with no fuel injected, pre-ignition firing conditions, in addition to different fuel quantities. In this experimental analysis, PIV technique is performed to observe the flow patterns of the charging gas. The obtained results indicate that the swirls behavior is similar under all operation conditions during the intake and compression strokes regardless of the engine speed. In comparison to pre-ignition firing process, generation of more swirl centers has been observed for both engine speeds i.e., 1000 rpm and 1500 rpm under motoring conditions. Additionally, at CA of 610 deg., the swirls centers were maintained for all configurations except for motoring conditions and lowest fuel quantity of 2 mg. Moreover, during expansion strokes for both engine speeds the least magnitude of velocity-vectors was observed under motoring condition. Nevertheless, the higher mean velocity-vectors among that of expansion stroke was observed under preignition firing configuration. The obtained results suggest that, the movement of the induced swirl centers across the piston cavity during expansion to exhaust strokes and increasing the engine speed corresponded to an increase in the mean-velocity, swirl ratios, and TKE.
Journal of Mechanical and Transport Engineering, 2017
The use of alternative energy sources for internal combustion (IC) engines is being raised. The most promising fuel in such application is natural gas in gaseous state, which mainly consists methane. It is mainly being used as an engine fuel for both monofuel and dual fuel configuration. Many investigations confirmed the benefits of application of dual fuel compression ignition engine fuelled with natural gas. The aim of this paper is analysis of engine operation parameters and emissions for two different locations of gas injector in the inlet duct. The operation parameters and NOx emission from this research are presented and compared for different natural gas shares in total energy delivered to the cylinder with fuel. The parameters are compared to monofuel operated engine.
ANALYSIS OF THE EFFECT OF NOZZLE HOLE DIAMETER ON CI ENGINE PERFORMANCE USING
An experimental study was carried out to find out the effect of fuel injector nozzle hole diameter on diesel engine performance using Karanja oil-diesel blends. For this experimental setup a 5.97 KW single cylinder, water-cooled, direct injection diesel engine with dynamometer was used for the experimental work. Engine performance parameters such as brake thermal efficiency (BTE), brake specific energy consumption (BSEC) ,brake power (BP), total fuel consumption(TFC) and exhaust gas temperature were calculated. These performance parameters were measured using three different size nozzles. One nozzle with holes of .25 mm, .25 mm and .15 mm, second nozzle with all three holes of .4 mm size, third nozzle with all three holes of .6 mm size. Results indicated that brake thermal efficiency decreased with the increase in nozzle size. Brake power increased with increase in nozzle size but with increasing load, brake power reduced. The brake specific fuel consumption increased with increase in nozzle size, with karanja oil -diesel blends having less brake specific fuel consumption but at peak load and with nozzle size of .6 mm, diesel had the least brake specific fuel consumption. Exhaust gas temperature increased with increase in nozzle size and percentage of karanja oil to diesel.
One of the important issues that today are considered by researchers as a research field is the study of combustion chamber in a variety of internal combustion engines. Different designs for the diesel engine combustion chamber are planned for this purpose. Open combustion chamber or direct injection and combustion chamber divided or indirect injection. Open combustion chamber or direct injection, which is widely used in heavy and industrial engines, and the combustion chamber divided in small engines with high revolution. The geometry of the combustion chamber in diesel engines (combustion ignition) has studied and discussed.
COMBUSTION PROCESS IN SPARK IGNITION AND COMPRESSION IGNITION ENGINES
The process of normal and abnormal combustion in SI and CI engines has been explained in the present paper. In case of SI engine, the air-fuel mixture is prepared in the intake system and then the mixture is inducted into the cylinder through the intake valve and the compression takes place. Then, the flame is generated in a turbulent manner. The high speed motion of flame development has been illustrated. The travelling of Flame has been explained and the engine flame-trace has been shown. The detonation and pre-ignition in spark-ignition engine have also been described. In case of CI engine, high-pressure fuel is injected at the end of the compression stroke into the cylinder. The injected fuel first evaporates and then mixed with the compressed hot air and then finally the ignition takes place. The combustion process in diesel engine has been illustrated. The detonation in compressed-ignition engine has also been given. The comparison between detonation in spark-ignition and compression-ignition engines has been done. Finally, the paper gives the clear view of the combustion process in SI and CI engines.
Study on selected parameters of engine with the active combustion chamber
Combustion Engines, 2023
The present study was focused on the combustion engine with a variable compression ratio (VCR), namely the four-stroke air-cooled engine with the active combustion chamber (ACC). An indicated pressure, torque, power, and specific fuel consumption of that engine were investigated experimentally as a goal of the present study. Experiments were conducted using two versions of an engine. Two parameters particularly influencing the ACC engine performance including the maximum compression ratio CRmax and the indicator γfm determining the correct operation of the ACC system, were described. It was found that the ACC engine allowed avoiding detonation combustion without changing the amount and composition of the combustible mixture, and even without delaying the ignition advance angle. In addition, the possible range of control of the combustion process allowed the ACC engine to operate with different types of hydrocarbon fuels, for example, in the form of petrol with various alcohol admixtures. The very intense flow of the combustible mixture inside the cylinder of the ACC engine allowed describing the combustion in the ACC engine with zero-dimensional mathematical models with the dual Vibe function providing the proper characterization of the heat release process. The use of very high maximum compression ratios allows the ACC engine to operate to a certain extent as a Homogeneous Charge Compression Ignition (HCCI) engine with high lambda coefficients.
The objective of this work is to describe the design of a constant volume combustion chamber with pre-combustion technique to simulate the mixture formation and combustion process via optical access. The engineering design criteria of the constant volume combustion chamber are considered to ensure the mixture conditions of typical CI engines with a compression ratio (CR) of 16-28. The analysis of both spray characteristics and strength of structure is considered for geometry of combustion chamber for test fuels: diesel, ethanol and bio-diesel. The strength of material simulation showed that the test rig is able to sustain under design criteria. Finally, a combustion chamber with tangential inlet for good mixing has been selected.