Browse Publications Technical Papers 1999-01-1513
1999-05-03

Performance and Emissions of an LPG Lean-Burn Engine for Heavy Duty Vehicles 1999-01-1513

Performance and emissions of an LPG lean burn engine for heavy duty vehicles were measured. The piston cavity, swirl ratio, propane - butane fuel ratio, and EGR were varied to investigate their effects on combustion, and thus engine performance. Three piston cavities were tested: a circular flat-bottomed cavity with sloped walls (called the “bathtub” cavity), a round bottomed cavity (called the “dog dish” cavity), and a special high-turbulence cavity (called the “nebula” cavity). Compared to the bathtub and dog dish cavities, the nebula type cavity showed the best performance in terms of cyclic variation and combustion duration. It was capable of maintaining leaner combustion, thus resulting in the lowest NOx emissions. High swirl improved combustion by achieving a high thermal efficiency and low NOx emissions. In general, as the propane composition increased, cyclic variation fell, NOx emissions increased, and thermal efficiency was improved. The thermal efficiency and cyclic variation were improved by EGR at λ = 1.4, compared to lean burn (λ = 1.5) without EGR.

SAE MOBILUS

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

Access SAE MOBILUS »

Members save up to 16% 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

Study on Homogeneous Lean Charge Spark Ignition Combustion

2013-01-2562

View Details

TECHNICAL PAPER

Reduction of NOx in Lean Exhaust by Selective NOx-Recirculation (SNR-Technique) Part I: System and Decomposition Process

982592

View Details

TECHNICAL PAPER

Optimization of Swirl and Tumble in KMC 2.4L Lean Burn Engine

940307

View Details

X