Two-Dimensional Measurements of the Mixture Concentration in the Combustion Chamber of a Spark Ignition Engine. Effects of Fuel Injection Conditions and Intake Flow.

This paper summarizes the development and application of advanced thermal imaging techniques to a spark ignition engine at the University of Cambridge Department of Engineering. A thermal imaging system is described which is capable of viewing and recording the cylinder head surface temperature and piston surface temperature in a firing spark ignition engine. Two-dimensional temperature distributions of these surfaces were measured both during the engine's warm-up period and steady state operations. The influence of the engine's operating conditions was examined upon the temperature distributions of combustion chamber surfaces during the engine's warm-up period. The effect of spark timings, particularly the onset of knocking combustion on the surface temperatures, has been studied.

Download Full-text

Study on Different Flame Jet Ignition Variants in a Stratified Charge Spark Ignition Engine

Design, Application, Performance and Emissions of Modern Internal Combustion Engine Systems and Components ◽

10.1115/icef2002-490 ◽

2002 ◽

Author(s):

Edward Rakosi ◽

Radu Rosca

Keyword(s):

Combustion Chamber ◽

Fuel Consumption ◽

Output Power ◽

Cylinder Head ◽

Fuel Injection ◽

Spark Ignition ◽

Spark Ignition Engine ◽

Working Process ◽

Stratified Charge ◽

Direct Fuel Injection

The paper presents some experimental results regarding a stratified charge spark ignition engine. We have applied the divided combustion chamber concept, using a flame jet in order to ignite the fuel-air mixture. The fueling system was a combined one: the cylinder head combustion chamber (secondary, auxiliary) was fueled by direct fuel injection, while the main combustion chamber was fueled with lean mixture by the means of a carburetor. During the tests we have used two types of main combustion chamber and three types of secondary combustion chamber. Thus, we had the possibility to use different compression ratios, starting with the lower ones, imposed by the less volatile fuels and ending with the higher ones, that led to the highest output power and a steady working process. In the meantime, three types of spark plugs were tested. We have also studied the HC and CO emissions, as well as the fuel consumption.

Download Full-text

An investigation of in-cylinder tumbling motion in a four-valve spark ignition engine

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1243/0954407011525511 ◽

2001 ◽

Vol 215 (2) ◽

pp. 273-284 ◽

Cited By ~ 15

Author(s):

Y Li ◽

S Liu ◽

S-X Shi ◽

M Feng ◽

X Sui

Keyword(s):

Combustion Chamber ◽

Flow Structure ◽

Laser Doppler Anemometry ◽

Spark Ignition ◽

Spark Ignition Engine ◽

Cylinder Wall ◽

Data Processing Method ◽

Break Up ◽

Tumbling Motion ◽

Intake Flow

The formation and break-up of the tumble in the cylinder were studied in a single-cylinder four-valve spark ignition engine using laser Doppler anemometry (LDA) measurements and multidimensional numerical simulations. The flow structure generated by the tumble break-up was also analysed using the cycle-resolved LDA data processing method. These results show that, during the intake stroke, two counter-rotating vortices are generated in the cylinder by the intake flow along the two sides of the cylinder. They then gradually evolve into the tumble vortex at the initial stage of the compression stroke. Tumble motion can be strengthened by increasing the intake flow going along the surface of the exhaust valves and/or decreasing the intake flow descending directly along the cylinder wall on the side of intake valves. Although a partially decayed tumble vortex still exists in the central part of the combustion chamber near the end of compression, in other parts of the combustion chamber the tumble distorts and breaks up into small vortices and eddies so that the root mean square velocity fluctuation increases. The flow structure generated by the tumble break-up has a characteristic of lower frequency and larger eddy scale.

Download Full-text