Browse Publications Technical Papers 2007-01-3557
2007-08-05

An Investigation on Knock and Pre-ignition with Tumble Induced Turbulence 2007-01-3557

A study on the effect of induction manifold angles in tumble induced turbulence on detonation and pre-ignition in spark-ignition engines was conducted on a Ricardo E6 variable compression engine. A new cylinder head was designed and manufactured with four induction manifold inserts with angles of 30°, 40°, 50° and 60° in addition to the original angle of 90°. The onset of pre-ignition and detonation were defined by a piezo-electric pressure transducer. Knock was characterized by the “knock-limited compression ratio” concept. However pre-ignition was characterized by the input electrical power consumed by a pre-igniter acting as an artificial hot spot. A set of experiments were carried out on each induction manifold to cover the effect of the design and operating parameters of the engine on detonation and pre-ignition. The experiments revealed that the pre-ignition and detonation tendency increase with the increase of engine load, compression ratio, inlet air temperature, advancing the ignition timing and lowering the engine speed. Correlations were developed for the optimum angles of 40° and 50° to enable the onset of knock and pre-ignition to be predicted.

SAE MOBILUS

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

Access SAE MOBILUS »

Members save up to 17% 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:
JOURNAL ARTICLE

Insights into Engine Knock: Comparison of Knock Metrics across Ranges of Intake Temperature and Pressure in the CFR Engine

2018-01-0210

View Details

TECHNICAL PAPER

Some Considerations on the Measures of Cycle-by-Cycle Variations in SI Engine

891328

View Details

TECHNICAL PAPER

Development of a Control-Oriented Engine Model Including Wave Action Effects

2009-24-0107

View Details

X