The Effect of Heating New-Charged Air and Its Temperature in Intake System : (1st Report, Under Steady Flow and Motoring Condition)

Abstract

Although numerous reports show that the amount of new-charged air taken into a gasoline engine is greatly influenced by heat transfer in intake system and during intake process, identifying the actual heat transfer process in an intake system is extremely complex due to unsteady flow of new -charged air. Based on thermodynamics model, an equation which estimates the temperature of new -charged air before entering combustion cylinder was derived. The experiment using a modeled intake port was conducted under the following ranges : mass flow rate=0.5∼10 g/sec and wall temperature of intake port=323∼383K. In addition, motoring test was conducted under the similar ranges. The results were compared with the temperature of new-charged air obtained from the equation. They can be fit within about ±2.0 K and ±6.0 K under the steady flow model and motoring test respectively.