Grid techniques in the analysis of gaseous pollutant propagation

2003 ◽  
Author(s):  
Jerzy Pisarek ◽  
A. Blaszczuk
Keyword(s):  
Gaseous Pollutant ◽  
Pollutant Propagation

Prediction of gaseous pollutant emissions from a spark-ignition direct-injection engine with gas-exchange simulation

2021 ◽  
pp. 146808742110050
Author(s):  
Stefania Esposito ◽  
Lutz Diekhoff ◽  
Stefan Pischinger
Keyword(s):  
Gas Exchange ◽  
Combustion Chamber ◽  
Direct Injection ◽  
Spark Ignition ◽  
Operating Conditions ◽  
Pollutant Emissions ◽  
Operating Parameters ◽  
Gaseous Pollutant ◽  
Fuel Ratio ◽  
No Emissions

With the further tightening of emission regulations and the introduction of real driving emission tests (RDE), the simulative prediction of emissions is becoming increasingly important for the development of future low-emission internal combustion engines. In this context, gas-exchange simulation can be used as a powerful tool for the evaluation of new design concepts. However, the simplified description of the combustion chamber can make the prediction of complex in-cylinder phenomena like emission formation quite challenging. The present work focuses on the prediction of gaseous pollutants from a spark-ignition (SI) direct injection (DI) engine with 1D–0D gas-exchange simulations. The accuracy of the simulative prediction regarding gaseous pollutant emissions is assessed based on the comparison with measurement data obtained with a research single cylinder engine (SCE). Multiple variations of engine operating parameters – for example, load, speed, air-to-fuel ratio, valve timing – are taken into account to verify the predictivity of the simulation toward changing engine operating conditions. Regarding the unburned hydrocarbon (HC) emissions, phenomenological models are used to estimate the contribution of the piston top-land crevice as well as flame wall-quenching and oil-film fuel adsorption-desorption mechanisms. Regarding CO and NO emissions, multiple approaches to describe the burned zone kinetics in combination with a two-zone 0D combustion chamber model are evaluated. In particular, calculations with reduced reaction kinetics are compared with simplified kinetic descriptions. At engine warm operation, the HC models show an accuracy mainly within 20%. The predictions for the NO emissions follow the trend of the measurements with changing engine operating parameters and all modeled results are mainly within ±20%. Regarding CO emissions, the simplified kinetic models are not capable to predict CO at stoichiometric conditions with errors below 30%. With the usage of a reduced kinetic mechanism, a better prediction capability of CO at stoichiometric air-to-fuel ratio could be achieved.

scholarly journals Impact of gravitation on gaseous pollutant source identification

2013 ◽  
Vol 26 (2) ◽  
pp. 261-268 ◽  
Author(s):  
Liping Pang ◽  
Yu Zhang ◽  
Hongquan Qu ◽  
Tao Hu ◽  
Jingquan Zhao
Keyword(s):  
Source Identification ◽  
Gaseous Pollutant ◽  
Pollutant Source

Performance evaluation of discharge plasma process for gaseous pollutant removal

2002 ◽  
Vol 55 (1) ◽  
pp. 25-41 ◽  
Author(s):  
Hyun Ha Kim ◽  
Graciela Prieto ◽  
Kazunori Takashima ◽  
Shinji Katsura ◽  
Akira Mizuno
Keyword(s):  
Performance Evaluation ◽  
Discharge Plasma ◽  
Pollutant Removal ◽  
Plasma Process ◽  
Gaseous Pollutant

scholarly journals Indoor Photochemistry Involving Ozone in Rural Location of Kannur−A Tropical Site in India

2019 ◽  
Vol 31 (10) ◽  
pp. 2152-2156
Author(s):  
V. Lekha ◽  
P. Pushpaletha
Keyword(s):  
Lung Function ◽  
Respiratory Symptoms ◽  
Residential Building ◽  
Health Problems ◽  
Outdoor Environment ◽  
Strong Impact ◽  
Background Concentrations ◽  
Rural Location ◽  
Gaseous Pollutant ◽  
Indoor Sources

This study reports the indoor ozone (O3) pollution in the rural location of Kannur, a tropical site in India, during March 2018 and the influence of their most important determinants. Measurements of indoor O3, NO, NO2 and NOx were carried out in a residential building for a period of one week. Measurements were taken from the kitchen, as it had been identified as the most polluted spot. The background concentrations of O3, NO, NO2 and NOx were also monitored. Indoor O3 originates mainly from the outdoor environment and is also produced from indoor sources. The results show that there is a higher level of indoor O3 during cooking hours. The study indicated that cooking activities in the kitchen had a strong impact on the indoor O3 level. Ozone is an important gaseous pollutant which may lead to severe health problems such as decreased lung function and respiratory symptoms.

A review on application of cerium-based oxides in gaseous pollutant purification

2020 ◽  
Vol 250 ◽  
pp. 117181 ◽  
Author(s):  
Ye Shan ◽  
Yangxian Liu ◽  
Ying Li ◽  
Wei Yang
Keyword(s):  
Gaseous Pollutant
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