Abstract:
This paper presents a model of 1D pulsating flows in partially opened pipes.
This is typical of inlet and exhaust pipes of internal combustion engines and piston
compressors. The introduction describes the current state of affairs at one dimensional
modeling pulsations according to the Method of Characteristics (MOC).
Subsequently, the main idea of MOC is presented. In the fourth chapter general
guidelines at initial and boundary conditions were presented. The parameters were
analyzed at space times domain as 3D diagrams. Next, two crucial resonant
frequencies are presented: first and second waveform which can be defined as a
quarter and half-length waves. Firstly, partially open end phenomena at space and
stage plane were presented. Secondly, the theory of acoustic wave propagation with
description of stage waves at analyzed ends of pipe was shown. Finally, existing test
rig dedicated to research the pulsating flow in pipes was shortly presented. This test
rig was built at Flow Metrology Division of Lodz University of Technology. In the
second part of this chapter the main assumption of an elaborated simulation algorithm
at Matlab Simulink environment was shown. Lastly, simulation results compared with
presented conceptions of modeling those systems with the emphasis into pulsation
dynamics according to resonant frequencies were discussed.
