Prediction of Exhaust Gas Temperature at the Inlet of an Underbody Catalytic Converter During FTP-75 Test

Cho, Yong-Seok; Kim, Chang-Rae; Kim, Duk-Sang; Lee, Jongwha; Lee, Soo-Won; Myung, Kwang-Hee; Choo, Jin-Seok

doi:10.4271/972913

Cited by 7 publications

(2 citation statements)

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“…The exhaust system is simulated by means of a onedimensional transient numerical model. One-dimensional models representing exhaust gas flow have been used by a number of researchers, including Cho et al [7] and Siemund et al [8], and have been shown to produce satisfactory results. The primary desired outputs of the model are the transient temperatures of the gas mixture, liquid film (if present), and pipe wall from start-up to the point when catalytic converter light-off is expected.…”

Section: Theory and Modellingmentioning

confidence: 99%

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Modelling the effects of condensation and evaporation of water on the transient temperatures inside the exhaust system of an internal combustion engine

Haworth

Dobson

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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A one-dimensional model of the transient temperatures in the exhaust system of an internal combustion engine, including the effects of condensation and evaporation of water, is used to predict the warm-up characteristics of the exhaust system. The aim of the model is to reproduce theoretically a ‘plateau’ observed in the experimentally measured temperatures in the catalytic converter, and to predict whether this plateau influences the light-off of the catalyst. The results of the numerical simulation are compared with the temperatures measured in a Volkswagen 1.6 l engine exhaust system. The simulation results exhibit the temperature plateau, but with some deviations from the experimental results. It was found that both evaporation and condensation must be included in the simulation for the plateau to be successfully modelled. It is concluded that in the real system these processes occur simultaneously as a series of microtimescale events as the system strives towards an equilibrium moisture condition. This moisture behaviour is responsible for the step up to the plateau temperature, but it was found that the final temperatures achieved by the system are not significantly influenced by the moisture behaviour. The presence of the moisture in the exhaust gas therefore decides the temperature profile during the early stages of warm-up (up to approximately 100 s after ignition) but is not expected to delay the light-off of the catalytic converter.

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Section: Theory and Modellingmentioning

confidence: 99%

“…Another method of accounting for the highly turbulent conditions is the use of a convective augmentation factor (CAF) [17], also called a turbulence enhancement factor [7]. This factor is used to calculate the effective Nusselt correlation for the real flow conditions according to…”

Section: ð14þmentioning

confidence: 99%