Selection of Injection Parameters for Various Engine Speeds in PCCI-Based Diesel Combustion with Multiple Injection

Abstract

The objective of this study is to obtain a strategy for adapting injection and exhaust gas recirculation (EGR) conditions to various engine speeds. An experimental study was conducted using a single-cylinder test engine and varying the injection timings of two-stage injection, the injection-quantity ratio, the EGR rate, and the swirl ratio at low (1300 rpm) and high (2300 rpm) engine speeds. When using base injection conditions, the results indicated that problems occurred for the high maximum pressure rise rate at low engine speed and the low thermal efficiency at high engine speed. At low engine speed, retarding the injection timings and increasing the first-injection quantity ratio reduced the maximum pressure rise rate without sacrificing engine performance. At high engine speed, advancing the injection timings improved the thermal efficiency but increased smoke emission. In addition to advancing the injection timings, a decrease of the first-injection quantity ratio reduced smoke emission.

Impacts on Nox Emission Control Measures to Achieve EURO VI Limits - A Review

“…Shanhangian and Ghojel et al [33] explored the effect of injection pressure on porous media with the help of high-speed imaging technique. The combustion chamber volume was reduced with an increase in size, heat capacity, pore density and specific surface area of the porous reactor.…”

“…Lower oxygen concentration and uniformed hot spots may also reduce the NOx formation. Navid Shahangian [33] et al investigated the influence of injection pressure and pore density on a porous medium. To access the technical viability high-speed imaging technique was employed and images are processed with the help of Matlab code to analyze the spray impingement.…”