Structure Improvement Analysis of Heavy Duty Diesel Engine Preheater

Abstract:

The vehicle fuel preheater is an important and effective means to improve operating condition during cold engine starting. A conclusion is reached that the fuel preheater improves operating efficiency of the engine effectively through a series of tests and analyses. A more efficient way to improve operating efficiency of fuel preheater is to install spoiler in the combustion chamber. In this paper, the CFD software is used to simulate the preheater combustion chamber installed spoiler. The temperature distribution, CO distribution, and O2 distribution of the combustion chamber are obtained at different spoiler locations and different spoiler sizes. The comparative analysis indicate that the optimal spoiler diameter is 70 mm, compared with the nonspoiler design, and the fuel preheater efficiency is increased by 17%. The optimal position of the spoiler is 80 mm from the bottom, and the efficiency of the fuel preheater is 11.4% higher than the original design in which the spoiler is 60 mm from the bottom spoiler.

Key words:diesel engine; fuel preheater; optimization; structural improvement