Influence of the Inner and Outer Secondary Air Ratios on the Combustion Characteristic and Flame Shape of a Swirl Burner with a Prechamber

Table 2

Experimental conditions and parameters.

ISA/OSA	2 : 1	1 : 1	1 : 2
Feeding speed (kg/h)	1140	1140	1140
Primary air (kg/h)	900	900	900
Primary air speed (m/s)	26.3	26.3	26.3
Inner secondary air (kg/h)	3889	2917	1945
Inner secondary air speed (m/s)	22.3	16.7	11.1
ISA swirl number (S)	1.6	1.6	1.6
Outer secondary air (kg/h)	1945	2917	3889
Outer secondary air speed (m/s)	14.0	21.0	28.0
Tertiary air (kg/h)	1955	1955	1955
Tertiary air speed (m/s)	4.5	4.5	4.5
All air temperature (°C)	20	20	20