Analysis of cycle-to-cycle variation and non-uniformity of energy production: Tests on individual cylinders of a radial piston engine

Czarnigowski, Jacek

doi:10.1016/j.applthermaleng.2011.02.027

Cited by 9 publications

(6 citation statements)

References 15 publications

(22 reference statements)

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“…In addition to COV IMEP n , the standard deviation of net IMEP (STD IMEP n ) is calculated to observe the cyclic variation from another perspective. Equations and are for calculation of COV IMEP n , whereas eqs and are for calculation of the mean value of IMEP n and STD IMEP n Here, N indicates consecutive sampled cycles at the experiments, x i is IMEP n of a specific combustion cycle, and y ( i ) is the value of IMEP n of the i th sample.…”

Section: Results and Discussionmentioning

confidence: 99%

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Investigation of Effects of Intake Temperature on Low Load Limitations of Methanol Partially Premixed Combustion

et al. 2019

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Methanol has unique properties as a fuel, and partially premixed combustion has promising results with high engine efficiency and low emissions. Low load studies with methanol partially premixed combustion are scarce, and the effect of intake temperature on low load methanol partially premixed combustion still remains an intriguing question. This study aims to investigate the effect of intake temperature on low load limitations of methanol partially premixed combustion by an experimental study. The engine was operated at 800 rpm under two different loads. The low load condition was performed at 3 bar Indicated mean effective pressure (IMEP), and the idle condition was commenced at 1 bar IMEP. From the results, it was seen that the intake temperature affected engine stability, engine performance, and engine emissions. The combustion stability decreased with the decrease of intake temperature. The ignition delay became longer and the peak cylinder pressure became smaller with lower intake temperature. The combustion efficiency reduced with the decrease of intake temperature from 0.99 to 0.96 at 3 bar IMEP, whereas it decreased from 0.99 to 0.98 at 1 bar IMEP for the single injection case and the split injection case. The thermodynamic efficiency remained constant at 0.43 at 3 bar IMEP, decreased from 0.30 to 0.28 at 1 bar IMEP for the single injection case, and reduced from 0.26 to 0.24 at 1 bar IMEP for the split injection case. The gross indicated efficiency increased from 0.41 to 0.42 at 3 bar IMEP, whereas it reduced from 0.29 to 0.28 and 0.26–0.24 at 1 bar IMEP at single injection and split injection, respectively. Total hydrocarbon emission increased, NO X emission decreased or remained constant, and CO emission remained constant with the decrease in intake temperature. Finally, the combustion phasing study was performed at 1 bar IMEP at constant intake temperature to determine the effect of the start of injection timing on the engine’s performance and the emissions under the idle condition.

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Section: Results and Discussionmentioning

confidence: 99%

“…In addition to COV IMEP n , the standard deviation of net IMEP (STD IMEP n ) is calculated to observe the cyclic variation from another perspective. Equations 5 and 6 are for calculation of COV IMEP n , whereas eqs 7 and 8 are for calculation of the mean value of IMEP n and STD IMEP n 34.…”

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confidence: 99%

Investigation of Effects of Intake Temperature on Low Load Limitations of Methanol Partially Premixed Combustion

et al. 2019

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“…In Czarnigowski et al, 2 it was shown that the application of dual ignition has a significant influence on the combustion process, especially in the scope of its stability. Effects of ignition control on combustion process non-repeatability in an engine with dual ignition system were also studied in Czarnigowski et al 48 Analysis of cycle-to-cycle variation and non-uniformity of the combustion process in such an engine was presented by Czarnigowski et al, 49 Czarnigowski, 50 and Ge ˛ca et al 51 Ignition in an aircraft engine was also studied by Xudong et al 52 who presented the modeling and simulation of spark frequency disorder. This paper analyzes the effect of changing the ignition advance angle of two spark plugs and the ignition sequence between them.…”

Section: Introductionmentioning

confidence: 99%

Effect of ignition advance angle offset in a dual ignition system of a large aircraft piston engine

Czarnigowski

Jakliński

Karpiński

2022

International Journal of Engine Research

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The paper presents the results of the experimental research on the combustion process inside the cylinder of a large piston radial aircraft engine with dual spark plug ignition. The tests were carried out on the ASz-62IR-16X radial engine equipped with a double, electronically controlled ignition system with two spark plugs in each cylinder. The constant engine speed tests allowed for comparing the combustion processes with ignition carried out with different ignition advance angle offset between both spark plugs. In the test, the ignition advance angle for one spark plug was changed while leaving the ignition advance angle for the other spark plug. The tests performed for two engine operating points were to change the angle of the front spark plug and the rear spark plug. The analyses were based on the recorded pressure signal from one of the engine cylinders. It has been shown that the ignition advance angle offset significantly affects the combustion process. The obtained results indicate the leading role of the rear spark plug in initiating the combustion process. When ignition is carried out with a steady rear spark plug advance angle, the combustion process practically does not change when the ignition advance angle of the front spark plug changes. However, changing the rear spark plug advance angle at a constant front spark plug ignition advance angle significantly changes the combustion process.

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“…In addition, a reduced attention is devoted to understanding the causes that originates this phenomenon. As an example, Czarnigowski [9] investigated the effect of cylinder-by-cylinder variation on indicated mean effective pressure (IMEP) in a radial nine-piston engine, founding differences in single cylinder IMEP up to 40%. Zhou et al [10] conducted an experimental and numerical study on a four-cylinder spark ignition engine to evaluate the influence of cylinder-by-cylinder variation on the performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cylinder-by-Cylinder Variation on Performance and Gaseous Emissions of a PFI Spark Ignition Engine: Experimental and 1D Numerical Study

et al. 2021

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Combustion stability, engine efficiency and emissions in a multi-cylinder spark-ignition internal combustion engines can be improved through the advanced control and optimization of individual cylinder operation. In this work, experimental and numerical analyses were carried out on a twin-cylinder turbocharged port fuel injection (PFI) spark-ignition engine to evaluate the influence of cylinder-by-cylinder variation on performance and pollutant emissions. In a first stage, experimental tests are performed on the engine at different speed/load points and exhaust gas recirculation (EGR) rates, covering operating conditions typical of Worldwide harmonized Light-duty vehicles Test Cycle (WLTC). Measurements highlighted relevant differences in combustion evolution between cylinders, mainly due to non-uniform effective in-cylinder air/fuel ratio. Experimental data are utilized to validate a one-dimensional (1D) engine model, enhanced with user-defined sub-models of turbulence, combustion, heat transfer and noxious emissions. The model shows a satisfactory accuracy in reproducing the combustion evolution in each cylinder and the temperature of exhaust gases at turbine inlet. The pollutant species (HC, CO and NOx) predicted by the model show a good agreement with the ones measured at engine exhaust. Furthermore, the impact of cylinder-by-cylinder variation on gaseous emissions is also satisfactorily reproduced. The novel contribution of present work mainly consists in the extended numerical/experimental analysis on the effects of cylinder-by-cylinder variation on performance and emissions of spark-ignition engines. The proposed numerical methodology represents a valuable tool to support the engine design and calibration, with the aim to improve both performance and emissions.

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Analysis of cycle-to-cycle variation and non-uniformity of energy production: Tests on individual cylinders of a radial piston engine

Cited by 9 publications

References 15 publications

Investigation of Effects of Intake Temperature on Low Load Limitations of Methanol Partially Premixed Combustion

Investigation of Effects of Intake Temperature on Low Load Limitations of Methanol Partially Premixed Combustion

Effect of ignition advance angle offset in a dual ignition system of a large aircraft piston engine

Effect of Cylinder-by-Cylinder Variation on Performance and Gaseous Emissions of a PFI Spark Ignition Engine: Experimental and 1D Numerical Study

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