Study on cold starting performance of a low compression ratio diesel engine by using intake flame preheating

Abstract

Power density improvement is one the main techniques for engine thermal efficiency promotion. For turbocharged Diesel engine, low compression ratio in normally adopted for safety consideration under high power density operation. However, low compression ratio tends to lead cold starting problem. In this study, the influences factors and performances of a 10-cylinder turbocharged Diesel engine was investigated. An intake flame preheating model was built and validated by series of bench tests. The optimization of starting parameters and flame heating was conducted eventually. Based on the study, the basic performance flame pre-heating system under different conditions was disclosed. The cold starting boundary parameters of the Diesel engine was found. Moreover, the best starting fuel injection parameters were acquired. The research is beneficial for Diesel engine power density promotion based on cold starting ability

Autoignition characteristics of diesel spray under different injection pressures and cold start strategy for compression ignition engines

“…33,34 Intake preheating or manifold burner is also widely used, especially for large diesel engines to warm up the air aspirated into the cylinder, which can elevate the compression-end temperature needed for the autoignition of the fuel spray. 35 For these cold start aid systems, one of the critical problems is how much thermal energy should be supplied. To determine that, the in-cylinder threshold temperature for the fuel autoignition is of great significance.…”