An experimental investigation on combustion and performance characteristics of supercharged HCCI operation in low compression ratio engine setting

摘要: Abstract This study investigates the effects of boost pressure on combustion and performance an early direct injection homogenous charge compression ignition (HCCI) engine at a low ratio (CR). A 2.0 L, four-cylinder, four-stroke, gasoline was converted to operate in HCCI mode. In addition, supercharger unit developed for boosting. The experiments were performed different intake manifold absolute pressures (MAP) from 1.0 1.6 bar loads using n-heptane fuel. investigated characteristics volumetric efficiency, in-cylinder pressure, heat release rate (HRR), maximum gas temperature, CA50 (crank angle by which 50% fuel is burnt), duration, apparent indicated mean effective (IMEP), brake (BMEP), friction (FMEP), thermal efficiency (ITE), (BTE), loss, exergy coefficient variation IMEP (COVIMEP), rise (MPRR) ringing intensity (RI). experimental results showed that high-efficiency operation feasible as 9.2 once variables are properly optimized appropriate level supercharging utilized. An increase seen increased. phasing advanced increasing or air–fuel equivalence values. Combustion events with 2–3 °CA aTDC show highest especially conditions. increased MAP. test also operating range can be extended high load limits.