Abstract
Realization of a low temperature combustion concept in homogeneous charge compression ignition (HCCI) engines is a cutting-edge technology that offers clean combustion in parallel with high thermal efficiency. Low combustion temperature prevents from NOx for-mation whereas homogeneous mixture assures smokeless exhaust. However, achieving the production feasibility by HCCI technology is hampered by high pressure rise rates and the resulting combustion noise at a high load operation. This paper explores combustion tim-ing parameters that are capable of maintaining permissible levels of pressure rise rates under a high load regime. On the basis of exper-imental data collected at a high load HCCI operation, pressure rise level was correlated with combustion duration. Furthermore, com-bustion duration has been found to scale with in-cylinder volume, for which 50% of mass fraction burned appeared. The results showed quantitatively limitations of engine load, pointing out on required combustion timings to achieve acceptable combustion harshness de-pending on engine load.
Highlights
Reciprocating combustion engines are responsible for one third of global CO2 emissions, and pose a high risk due to the presence of toxic components in the exhaust
This paper explores combustion timing parameters that are capable of maintaining permissible levels of pressure rise rates under a high load regime
On the basis of experimental data collected at a high load homogeneous charge compression ignition (HCCI) operation, pressure rise level was correlated with combustion duration
Summary
Reciprocating combustion engines are responsible for one third of global CO2 emissions, and pose a high risk due to the presence of toxic components in the exhaust. This paper explores combustion timing parameters that are capable of maintaining permissible levels of pressure rise rates under a high load regime. On the basis of experimental data collected at a high load HCCI operation, pressure rise level was correlated with combustion duration.
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