HEAT ENGINE PROVIDED WITH TURBO-SUPERCHARGER

摘要

The invention relates to a heat engine provided with a turbo-supercharger, said turbo-supercharger including a compressor, for compressing a gas mixture that is to be placed in the inlet of the engine, and a turbine that mechanically drives said compressor and is located at the outlet of the engine so as to release the exhaust gases from the engine. A charge air cooler (CAC) is positioned between the compressor and the intake manifold of the engine. The invention involves a pipe that is mounted at the inlet of the charge air cooler and has a length L1 and a diameter D1 that are selected so that the following applies: a single dimensionless parameter B represents the sensitivity of the pumping to the infrasound acoustics of the line upstream from the compressor and is predetermined on the basis of the analysis of a simple system, represented by the compressor coupled with a Helmholtz resonator (pipe leading to a plenum), the formulation B = U / 2 ?0 L0 of which translates the coupling between the compressor wheel power (numerator U = vane speed), the specific air line modes (denominator ?0 = specific Helmholtz pulsation), and the air column mass (denominator L = pipe length). Said dimensionless parameter B is at least less than a threshold value for B. Below said threshold value, the instability is contained around the operation point.