Acoustic calculation of the two-stroke carburetor internal combustion engine intake systems Available to Purchase

Sound propagation in the two-stroke carburetor internal combustion engines intake systems was considered; and it is shown that this could be considered as one-dimensional wave motion in the frequency range of the intake noise existing significant components. To simplify and unify acoustic calculations, model of an intake system is proposed in the form of a channel inhomogeneous over its cross section, which cylindrical sections correspond to the simulated system elements in flow cross section area and length. It is shown that nonlinear phenomena arising from the wide-amplitude waves in the intake tract elements could not be taken into account in practical calculations of the intake system acoustic characteristics of this class of engines, while hydraulic losses due to the intake tract cross section area inhomogeneities accompanied by their abrupt alteration should be taken into account. Proposed model of the intake system makes it possible to provide acoustic calculation by the matrix method using only three matrices that describe cylindrical section, abrupt expansion and abrupt contraction of the channel. In this case, gas flow is taken into account; and in the cylindrical sections - also the loss of acoustic energy due to friction and thermal conductivity. Proposed model of the intake system is universal, which makes it possible to calculate the intake tracts of various configurations and geometry significantly simplifying the acoustic calculation procedure, and there appears a possibility to optimize design of the intake system being developed even at the two-stroke carburetor internal combustion engine design stage.