Study on Effect of Engine Operating Parameters on Flame Characteristics

Sureshkumar, J.; Ganesan, V.; Mallikarjuna, J M; Elayaraja, R.

doi:10.4271/2015-01-0749

Cited by 4 publications

(5 citation statements)

References 7 publications

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“…In both cases, the optimization of current propulsion systems and the introduction of new ones requires the gathering of data on the range and operating conditions of these units under actual operating conditions. This is because the conditions of operation, particularly the load range of the engine and the steady-state and transient operation ratio, strongly influence the stresses on the structures and their lifetime [20][21][22]. However, these data cannot be translated between different types of vehicle, and especially between motor vehicles and aircraft.…”

Section: Introductionmentioning

confidence: 99%

Aircraft piston engine load distribution in steady state operating conditions

Czarnigowski¹,

Trendak²

2023

Combustion Engines

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The article presents the results of analysis of operational parameters of piston engine CA 912 ULT which is a propulsion system of ultralight gyroplane Tercel produced by Aviation Artur Trendak. Research was conducted under normal operating conditions of the autogyro and data was collected from 15 independent tests including a total of 14 flight hours conducted during training flights. Engine and flight parameters were recorded at 9 Hz during each flight using on-board Fligh Data Recorded system. Collective results were presented to show the statistical analyses of the individual parameters by determining the mean values, standard deviations and histograms of the distribution of these parameters. The analyses included engine speed, charge pressure, air temperature, oil temperature and exhaust temperature. Histograms of operating points defined by both engine speed and manifold air pressure were also determined. Analyses were carried out to determine the contribution of steady-state and transient engine operation. It was also shown that the dynamics of engine work in real operating conditions is small. Detailed analyses were conducted for steady-state conditions. The value of the engine load index was determined and its statistical analyses were carried out. It was shown that the engine operating points are concentrated mainly in the range of idle and power above 50% of nominal power. The most frequent range is 50% to 80% of nominal power.

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Section: Introductionmentioning

confidence: 99%

Aircraft piston engine load distribution in steady state operating conditions

Czarnigowski¹,

Trendak²

2023

Combustion Engines

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“…This resulted in higher lambda when compared to the smaller split ratio, while inducing faster initiation, growth and propagation of the flame kernel and enabling greater number of radicals to be consumed. 17 The volumetric efficiency had also improved due to the effective heat transfer (or cooling effects) taking place between the first injection's vapourising fuel and the induced air, which allows operation at higher compression ratios. 10,13,17,18 The levels of NOx in this case were about 15% lower when compared to that of single injections, but at the expense of higher THC emissions.…”

Section: Introductionmentioning

confidence: 99%

“…17 The volumetric efficiency had also improved due to the effective heat transfer (or cooling effects) taking place between the first injection's vapourising fuel and the induced air, which allows operation at higher compression ratios. 10,13,17,18 The levels of NOx in this case were about 15% lower when compared to that of single injections, but at the expense of higher THC emissions. 19 On the contrary, a smaller split ratio, has been stated to maximise the equivalence ratio in the spark plug zone because the fuel is directed towards the spark plug under the guidance of the piston bowl.…”

Section: Introductionmentioning

confidence: 99%

“…17 The volumetric efficiency had also improved due to the effective heat transfer (or cooling effects) taking place between the first injection’s vapourising fuel and the induced air, which allows operation at higher compression ratios. 10,13,17,18 The levels of NOx in this case were about 15% lower when compared to that of single injections, but at the expense of higher THC emissions. 19…”

Section: Introductionmentioning

confidence: 99%

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Investigations of split injection properties on the spray characteristics using a solenoid high-pressure injector

Dhanji

Zhao

2021

International Journal of Engine Research

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An on-going challenge with Gasoline direct injection (GDI) engines is achieving rapid activation of the exhaust catalyst during cold starts, in order to reduce the Nitrogen Oxide (NOx) emissions. Injecting late in the compression stroke, in the efforts to form a stratified mixture, provides the fuel insufficient time to be entrained with the surrounding charge. This results in locally fuel rich diffusion combustion and the formation of high levels of particulate matter. Employing a split injection strategy can help tackle these issues. The current study examines the effects of a split injection strategy on the spray characteristics. Varying pulse width (PW) combinations, split ratios and dwell times are investigated using a Solenoid actuated high pressure injector. The injected quantity and the droplet characteristics of a target plume are investigated. The experiments were performed in a constant volume spray chamber. The droplet velocities and sizes were measured using Phase Doppler Particle Anemometry (PDA). Short and large PWs, in the range of 0.3–0.8 ms, were investigated. The results revealed that the highest injected quantity of fuel was measured with the shortest dwell time of 2 ms, owing to increased interactions between the injection events, which led to larger Sauter mean diameters (SMDs) measured. The SMDs for the shorter PW of 0.4 ms were generally larger than 0.8 ms PW. The droplets in this case were affected by the closely spaced opening and closing events of the Solenoid valve.

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“…As demonstrated by the authors of paper, dynamic conditions significantly affect the propagation of the flame front [18] and thus the results of the combustion process [5]. It is therefore important to test engines under these conditions [14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of operating parameters of the aircraft piston engine in real operating conditions

Czarnigowski¹,

Rękas²,

Ścisłowski³

et al. 2021

Combustion Engines

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The article presents the results of analysis of operational parameters of piston engine CA 912 ULT which is a propulsion system of ultralight gyroplane Tercel produced by Aviation Artur Trendak. Research was conducted under normal operating conditions of the autogyro and data was collected from 20 independent tests including a total of 28 flight hours, divided into training flights and competition flights.Engine speed, manifold air pressure and temperature, fuel pressure, injection time, and head temperature were recorded at 9 Hz during each flight. Collective results were presented to show the statistical analyses of the individual parameters by determining the mean values, standard deviations and histograms of the distribution of these parameters. Histograms of operating points defined by both engine speed and manifold air pressure were also determined. Analyses of the engine dynamics as a distribution of the rate of change of the engine rotational speed were also carried out. It was shown that the engine operating points are concentrated mainly in the range of idle and power above 50% of nominal power. The most frequent range is 70-80% of nominal power. It was also shown that the dynamics of engine work in real operating conditions is small. It was also shown that the way of use significantly influences the distribution of operating points. During training flights, an increase in the number of take-offs and landings causes an increase in the amount of engine work at take-off and nominal power and at idle.

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Study on Effect of Engine Operating Parameters on Flame Characteristics

Cited by 4 publications

References 7 publications

Aircraft piston engine load distribution in steady state operating conditions

Aircraft piston engine load distribution in steady state operating conditions

Investigations of split injection properties on the spray characteristics using a solenoid high-pressure injector

Analysis of operating parameters of the aircraft piston engine in real operating conditions

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