Combustion

Question 1

What is premixed (heterogeneous) combustion?

Answer 1

is a separate class of unsteady
combustion. It is assumed that fuel and air are perfectly mixed before combustion
process is initiated. Such combustion is found in gasoline (Otto) engines

Question 2

What is Heterogeneous combustion

Answer 2

in its way, is characterized by a presence of a fuel
spray or fuel jet. In this situation the fuel is injected into air where it is ignited and
burned. Example of such combustion can be found in diesel engines

Question 3

What chemical compounds is determined by fuel and air.

Answer 3

water, carbon, oxygen, nitrogen, sulfur oxides

Question 4

What chemical compounds from combustion

Answer 4

CO, HC, NOx, PM

Question 5

What is the energy needed for chemical energy releas to occur (change of entalpy) called

Answer 5

Activation energy

Question 6

Solve one stoiciometric task

Question 7

What is air-excess ratio

Answer 7

air-fuel ratio actual divided by air-fuel ratio stoiciometric

Question 8

What is fuel-air ratio?

Answer 8

1 divided by air excess ratio

Question 9

What happens is lambda =1?

Answer 9

There is no access oxygen available in the combustion