4734 ディーゼルエンジンにおけるEGRガスの気筒分配の計測と数値解析(S55-2 エンジン現象解析-基礎計測と数値計算-(2),S55 エンジン現象解析-基礎計測と数値計算-)

抄録

A fluid numerical simulation in the induction system of the diesel engine was done to make uniform cylinder distributions of EGR-gas. The finite volume method was used to solve 3-dimensional unsteady flow of the mixture and EGR gas in the diesel induction system. The one-dimensional engine simulator was also used to get the transient boundary conditions of the 3d simulations. EGR ratio of each cylinder on the real engine was measured by means of the exhaust gas component analysis. In the experiment, CO2 gas was used as quasi-EGR-gas and the engine was rotated by the electric motor. The simulation and experimental results showed that EGR ratio in the edge cylinders was lower than it in the central cylinders when EGR-gas was induced at the center of the induction pipe. The cylinder-to-cylinder EGR deviation was reduced with a hollow distribution of EGR-gas density at the collector inlet section.