The influence of mixture preparation in the intake port on the performance of a spark-ignited four-stroke engine
An experimental technique is developed for evaluating the influence of mixture preparation in the intake port on the performance of a spark ignited engine. The preparation components studied are fuel vapor, droplets, and liquid streams. The fuel in these three distinct forms are produced and varied in a specially designed mixture preparation system, which delivers an air/fuel mixture to a test cylinder of an engine. Incorporated in the preparation system are devices for measuring the flow rates of fuel in these forms. A method of estimating the vapor concentration of a gasoline in the preparation channel by the use of simple temperature measurements is also presented. The effect of these fuel forms on in-cylinder pressure performance and exhaust gas concentrations are investigated in a 1.9 L Ford engine. A matrix of engine operations are studied along with two gasolines of different volatilities. The results of this investigation show that the operation of the engine at low speeds and low manifold absolute pressures is most susceptible to the effects mixture preparation. For those engine operating conditions affected, the results show that by increasing the amount of fuel in liquid stream form, the performance of the engine is generally diminished. In addition, equivalent mixtures resulting from a conventional injector and a pneumatic atomizer in the intake port are identified relative to engine performance.
- Research Organization:
- Michigan Technological Univ., Houghton, MI (United States)
- OSTI ID:
- 6927722
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330101* -- Internal Combustion Engines-- Spark-Ignition
ATOMIZATION
DISPERSIONS
DROPLETS
ENGINES
EXHAUST GASES
FLUID MECHANICS
FLUIDS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUELS
GASEOUS WASTES
GASES
GASOLINE
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
LIQUID FUELS
LIQUIDS
MECHANICS
MIXTURES
PARTICLES
PERFORMANCE
PETROLEUM PRODUCTS
PNEUMATICS
SAMPLE PREPARATION
TEMPERATURE MEASUREMENT
VAPORS
WASTES