Browse Publications Technical Papers 2014-01-1248

Effects of Temporal and Spatial Distributions of Ignition and Combustion on Thermal Efficiency and Combustion Noise in DICI Engine 2014-01-1248

The effects of the temporal and spatial distributions of ignition timings of combustion zones on combustion noise in a Direct Injection Compression Ignition (DICI) engine were studied using experimental tests and numerical simulations. The experiments were performed with different fuel injection strategies on a heavy-duty diesel engine. Cylinder pressure was measured with the sampling intervals of 0.1°CA in order to resolve noise components. The simulations were performed using the KIVA-3V code with detailed chemistry to analyze the in-cylinder ignition and combustion processes. The experimental results show that optimal sequential ignition and spatial distribution of combustion zones can be realized by adopting a two-stage injection strategy in which the proportion of the pilot injection fuel and the timings of the injections can be used to control the combustion process, thus resulting in simultaneously higher thermal efficiency and lower noise emissions. Simulated results show that if a large amount of the combustion occurs near the liner walls of the combustion chamber, this significantly contributes to high amplitude pressure oscillations, which leads to heavy knock and low thermal efficiency. Therefore, a well-organized combustion process would be one in which low temperature combustion occurs in the wall regions and subsequently high temperature combustion occurs at the central regions of the chamber, resulting in higher thermal efficiency and lower noise emissions.


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


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:

Selection of Swirl Ratio in Diesel Engines Based on Droplet Trajectory Analysis


View Details


Control of CAI Combustion Through Injection Timing in a GDI Engine With an Air- Assisted Injector


View Details


Proposition of a Stratified Charge System by Using In-Cylinder Gas Motion


View Details