“Wetting” the Appetite of Spark Ignition Engines for Lean Combustion
Single-cylinder spark ignition engine experiments conducted at constant speed, fixed airflow, and using isooctane as the fuel, demonstrated the effects of fuel-air mixture preparation was changed by varying the time of fuel injection in the induction manifold, near the intake valve port. For comparison, a prevaporized fuel-air mixture was also investigated. Emphasis was placed on determining the effects of mixture preparation on combustion characteristics. Based on the results from this study, the often favored prevaporized mixture of fuel and air may not be the best diet for lean engine operation. /SAE/
Flow Injection (FI) techniques for use with Atomic Absorption Spectrometry (AAS) ::: have attracted considerable research interest for sample introduction and calibration ::: strategies. The interest continues in on-line preconcentration and matrix modification ::: which are carried out by the incorporation of liquid-liquid extraction, ion-exchange, ::: immobilised reagents, gas/vapour generation and continuous precipitation-filtration ::: devices into suitably designed manifolds. Indirect determination of inorganic anions and ::: organic compounds is becoming routine by FI–flame AAS. The direct analysis of solid ::: samples, which is a shortcoming of flame AAS, was recently carried out by on-line ::: electrolytic dissolutions. [Continues.]