Evaluation of four-pole parameters for a straight pipe with a mean flow and a linear temperature gradient

Abstract

Four-pole parameters for a straight pipe system in the presence of a uniform mean flow and a linear temperature gradient are presented. The system was analyzed using first-order perturbation theory and a Green’s function approach. The general four-pole matrix derived reduces exactly to several other simpler cases already in the literature. The use of the matrix in engine exhaust system predictions is also given.