1971-02-01

The Effect of Temperature Variations in the Engine Combustion Chamber on Formation and Emission of Nitrogen Oxides 710158

Temperature variation in the combustion chamber of spark ignition engines is a vital factor in determining exhaust pollutant concentrations. Oxides of nitrogen are particularly affected. The temperature and concentration variations were investigated both theoretically and experimentally.
A nonuniform model of the combustion process was developed. Calculations based on this model show that a temperature difference of the order of 600 K can be established across the cylinder. The validity of this model was substantiated by results of infrared spectroscopic measurements in the operating engine cylinder.
The kinetic mechanism for formation of nitric oxide was used, along with the nonuniform combustion model, to investigate the formation of nitric oxide in the cylinder. Results of the kinetic calculation show that the temperature gradient across the cylinder has a profound effect on the nitric oxide formation. The calculations are shown to be in agreement with results of direct cylinder sampling for a variety of engine variables including fuel-air ratio, spark timing, and engine speed.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Analysis of Hydrocarbon Emissions Mechanisms in a Direct Injection Spark-Ignition Engine

830587

View Details

TECHNICAL PAPER

Effects of Compression Ratio on Combustion Characteristics of a Direct-Injection Diesel Engine

872056

View Details

TECHNICAL PAPER

The Use of Auxiliary Ignition Devices to Improve Combustion of Low Cetane-High Volatility Fuels in a Diesel Engine

880428

View Details

X