Exhaust gas mass flow

The exhaust gas mass flow m is the mass of the exhaust gases of an internal combustion engine to be removed or removed in a specific time unit . It is given in kg / h or g / s:

${\displaystyle {\dot {m}}=\rho \cdot C\cdot A=\rho \cdot {\dot {V}}}$

(with : mass flow (also often μ), ρ : density of the medium, C : mean flow rate , A : cross-sectional area : volume flow ). ${\displaystyle {\dot {m}}}$ ${\displaystyle {\dot {V}}}$

Exhaust gases consist of the combustion products including the nitrogen content from the combustion air. Since the combustion is usually "run" with excess air , there is also the excess proportion of oxygen . The composition of the exhaust gases varies depending on the type of fuel. The main components of the exhaust gas, however, always contain carbon dioxide , carbon monoxide , water vapor, nitrogen, unburned carbon as soot , nitrogen oxides and aerosols from unburned fuel and oil mists from engine lubrication. Using a combustion calculationthe exhaust volume and the mass of the exhaust gases can be determined.

Combustion calculation, exhaust gas composition and exhaust gas mass flow

Combustion calculations with the corresponding exhaust gas compositions are particularly efficient for the heat engineering application area using a calculation algorithm according to Werner Boie .

Individual evidence

1. ↑ Science online lexica: Entry on "Motor vehicle exhaust gases" in the lexicon of chemistry
2. ↑ Beising, R .: Laboratory analyzes of fuels to determine emissions ( Memento of November 12, 2004 in the Internet Archive ) ( MS PowerPoint ; 460 kB), EnBW , September 17, 2002
3. ↑ B. Glück: "Material values ​​and combustion calculation" .