Thermodynamic analysis of endoreversible six-stroke Otto cycle with respect to equivalence ratio, residual gas fraction and mean piston speed

Arabacı, Emre

doi:10.18245/ijaet.500789

Cited by 2 publications

(5 citation statements)

References 27 publications

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“…1 . At the end of compression stroke, the fuel mass ( ) is injected into 1 and 2 mass is created [3,23].…”

Section: Working Fluid Modelmentioning

confidence: 99%

“…The equivalence ratio ( ) is obtained by dividing the stoichiometric air-fuel ratio by the actual air-fuel ratio ( ) (Eq 6) [3]. In Diesel engines, the load control is provided by changing the ( ) value, and the mixture is made leaner ( < 1) by reducing the amount of fuel injected for load adjustment [3].…”

Section: Working Fluid Modelmentioning

confidence: 99%

“…The lost power ( ) caused by friction (called friction power) is expressed as a function of the friction coefficient and piston speed [3].…”

Section: Friction Modelmentioning

confidence: 99%

“…Therefore, it is difficult to determine the actual engine performance using ideal cycle models. Also, parametric studies that can be done in such classical cycles are quite limited [3]. Cycle models in which these cycles in classical thermodynamics are assumed to take place in finite time and parameters such as friction, irreversibilities, combustion, heat losses, gasexchange are taken into account, are within the scope of finite-time thermodynamics in modern thermodynamics.…”

Section: Introductionmentioning

confidence: 99%

“…In finite-time thermodynamics, cycles are internally reversible and can therefore also be called endoreversible cycles [4]. In finite time engine cycle models, the effect of design and operating parameters such as equivalence ratio, stroke length, cylinder wall temperature, cylinder diameter, inlet temperature, inlet pressure, working fluid, compression ratio, and engine speed can be examined [3]. In previous studies, it is seen that finite-time thermodynamics is frequently used to examine the performance of real engine cycles.…”

Section: Introductionmentioning

confidence: 99%

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Effects of design and operating parameters on the performance of a quasi-realistic Diesel cycle engine

Kılıç¹,

Arabacı²

2021

International Journal of Automotive Engineering and Technologies

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Although Diesel engines have begun to be abandoned in the automotive industry due to the emission legislations of the world, they are still widely used in generators, work machines, agricultural machines, and heavy vehicles due to their high power density and thermal efficiency. The classical Diesel cycle, which is the thermodynamic cycle of Diesel engines, was developed by taking into account irreversibilities, heat transfer losses, friction, and gas exchange process, and a quasi-realistic Diesel cycle was obtained. Also, the working fluid of the Diesel cycle has been accepted as an air-fuel-residual gas mixture instead of air. This Diesel cycle model is very useful to examine the effect of Diesel engines' design and operating parameters on engine performance. For this study, the effect of variation in equivalence ratio, stroke-bore ratio, and compression ratio on engine performance was examined. Thermal efficiency, maximum temperature, exhaust temperature, fuel consumption, and specific fuel consumption are used as engine performance parameters. The characteristics and operating conditions of a Diesel engine in a power generator were used for the numerical study. Engine performance increased by increasing the equivalence ratio, which is the engine operating parameter. When the compression ratio, which is the structural parameter, increased, the engine performance increased, but the maximum temperature also increased, although it was not desired. Therefore, it is necessary to optimize the compression ratio and the maximum temperature. Again, when the stroke-bore ratio, which is a structural parameter, was increased, engine performance decreased, but the maximum temperature decreased as desired. For optimization of the two structural parameters, compression ratio, and stroke-bore ratio, it is necessary to decrease the stroke-bore ratio while increasing the compression ratio. The results obtained with the numerical study using the created model are guiding for engine designers.

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“…1 . At the end of compression stroke, the fuel mass ( ) is injected into 1 and 2 mass is created [3,23].…”

Section: Working Fluid Modelmentioning

confidence: 99%

Section: Working Fluid Modelmentioning

confidence: 99%

“…The lost power ( ) caused by friction (called friction power) is expressed as a function of the friction coefficient and piston speed [3].…”

Section: Friction Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of design and operating parameters on the performance of a quasi-realistic Diesel cycle engine

Kılıç¹,

Arabacı²

2021

International Journal of Automotive Engineering and Technologies

Self Cite

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Reducing emissions of an SI engine by alternative spark plugs with hydrogen addition and variable compression ratio

Baş

Akar

Serin

2020

International Journal of Automotive Engineering and Technologies

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As a consequence of the emissions-cheating scandals and more strict emission regulations enforce researchers to reduce emissions out and find alternative fuels for SI engines. For this purpose, various spark plugs are available in the market with different electrode materials. However, they have not been tested together with different engine parameters. Hence, emissions out from a variable compression spark-ignited engine with different spark plugs and hydrogen enrichment were the scope of this study. The tests were conducted with a fourstroke, single-cylinder, naturally aspirated, variable compression ratio (VCR) engine. Two different compression ratios (CR) of 8.5:1 and 10:1 at maximum brake torque (MBT) spark timing applied to assess the effects of different spark plugs and hydrogen usage at different engine loads. Copper, iridium and platinum spark plugs were tested for each experiment condition. Also, hydrogen was added through the intake manifold with flow rates of 0, 2 and 4 l/min to enhance the combustion of the VCR engine. Carbon monoxide (CO), carbon dioxide (CO2), nitrogen oxides (NOx) and unburned hydrocarbons (UHC) emission values were measured in this study. According to test results, with iridium and platinum spark plug usage, hydrogen addition and higher CR, the engine emitted lower CO and UHC at all engine loads. However, a higher amount of CO2 was emitted because of increased completeness of the combustion and the amount of NOx emissions rose due to increment in-cylinder temperatures. These variances were more apparent with platinum spark plug usage compared to the iridium spark plug. As a result, the usage of iridium and platinum spark plugs were shown lower incomplete emissions products out, except NOx emissions.

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Thermodynamic analysis of endoreversible six-stroke Otto cycle with respect to equivalence ratio, residual gas fraction and mean piston speed

Cited by 2 publications

References 27 publications

Effects of design and operating parameters on the performance of a quasi-realistic Diesel cycle engine

Effects of design and operating parameters on the performance of a quasi-realistic Diesel cycle engine

Reducing emissions of an SI engine by alternative spark plugs with hydrogen addition and variable compression ratio

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