In the thermodynamical design process of IC engines one can identify three primary areas of concern as regards the quest towards maximising the engine performance: the cylinder process, the gas exchange process, and the unsteady flow in the gas conduits, the latter being frequently referred to as wave action. Whereas the cylinder process can be analysed in isolation from the
other two when the valves are closed, the wave action substantially influences the performance of the gas exchange. This is even more important in the case of turbocharged engines, for the knowledge of the interaction of flow pulsations with the turbine is instrumental in arriving at an optimal performance of the entire turbocharged system.
As one of the pioneers in the area of turbocharging of large Diesel and gas engines, ABB Turbo Systems Ltd. (formerly Brown Boveri & Co.) have also been at the forefront of the development of the calculation methods for performance prediction and optimisation. By staying abreast with the current research efforts, and through original contributions to the numerical methods for predicting one-dimensional wave action in the engine pipework and the associated turbocharging
system components, it is ensured that the company’s in-house simulation software delivers the accuracy demanded by ever-increasing performance and emission requirements.
Surveyed in the paper are the methods for calculating the wave action in the manifolds of IC engines, starting with the first developments (which nevertheless are still at the base of the most modern calculation methods), up to and including the most recent developments. Different methods are compared on the basis of published results and own calculations. Current research
activities are also indicated. Although it has been claimed that the one-dimensional methods were to be replaced by the two- or three-dimensional schemes, it is shown in the paper that they
still constitute the backbone of the contemporary simulation practice and are capable of being further refined.
Тематска област:
Уводни рад:
Да
Датум:
14.03.2011.
Бр. отварања:
818
11th International Conference on Accomplishments in Mechanical and Industrial Engineering
Датотека уз рад
(3.67 MB)
