Browse Publications Technical Papers 2019-01-0556
2019-04-02

Study on Heat Losses During Flame Impingement in a Diesel Engine Using Phosphor Thermometry Surface Temperature Measurements 2019-01-0556

In-cylinder heat losses in diesel engines deteriorate engine efficiency significantly and account for approximately 17% [1] of the injected fuel energy. A great part of the heat losses during diesel combustion presumably arises from the impingement of the flame. The present study investigates the heat losses during flame impingement onto the piston bowl wall of a full metal heavy-duty diesel engine with a small optical access through a removed exhaust valve. The surface temperature at the impingement point of the flame was determined by evaluating a phosphor’s temperature dependent emission decay. Simultaneous cylinder pressure measurements and high-speed videos are associated to the surface temperature measurements in each cycle and link surface temperature reading to a specific impingement and combustion events. The surface temperature data are then analyzed in regards to the exact impingement timing, the velocity of the tip of the impinging flame, the cylinder pressure and the pressure rise rate. [1] Jia M, Gingrich E, Wang H, Li Y, Ghandhi JB, Reitz RD. Effect of combustion regime on in-cylinder heat transfer in internal combustion engines. Int J Engine Res 2016;17:331–46. doi:10.1177/1468087415575647.

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