Abstract
Increasing heat transfer and heat transfer coefficient as the combined effect of impingement distance and injection pressure has been explored in the previous report. However, local temperature distribution was limited to the discussion. Clearly, investigation of near-wall temperature in the heat transfer analysis is absolutely necessary. This has a crucial effect on the local heat flux to understand the heat transfer phenomenon on the combustion chamber walls. The local temperature and KL factor were investigated by using a high-speed video camera and a two-color method by using a volume vessel with a fix-impingement wall. We found that the local temperature and KL factor distribution increase in low injection pressure. This result had a dominant effect on local heat transfer.
Highlights
Vehicle electrification is vigorously promoted to achieve net-zero CO2 emissions by 2050, considering one of the significant contributors of global CO2 emissions comes from road transport
The flame luminosity was figured out at 0.9 ms after start of injection (ASOI) only during injection pressure of 120 and 180 MPa. It was unseen at injection pressure 80 MPa at 0.9 ms ASOI when increasing the time to 1.2 ms ASOI, the flame luminosity appeared
The effects of injection pressure on local temperature and soot emission distribution were investigated in the flat-wall impinging diesel flame under diesel like-condition
Summary
Vehicle electrification is vigorously promoted to achieve net-zero CO2 emissions by 2050, considering one of the significant contributors of global CO2 emissions comes from road transport. In order to practically minimize the long-term CO2 emission, vehicle electrification and thermal efficiency improvement of internal combustion engines is absolutely necessary. As an effective remedy to improve the thermal efficiency of diesel engines, reduction of heat loss through the engine combustion chamber wall is known to have significant potential. Diesel Engines and Biodiesel Engines Technologies on improving the thermal efficiency of diesel engines. It was conducted using a single-cylinder diesel engine [2–5] as well as a wall insertion-type constant volume vessel (CVV) [6–8]. To enhance thermal efficiency in the design of future engines, complete knowledge of the heat loss pathway from combustion gas to cylinder wall is essential
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