Table 2. Maximum Signal of Flame at Each Measurement Point under Different Test Conditions.

	in front of the cavity			behind the cavity
no.	F1 (V)	F2 (V)	average value (V)	F3 (V)	F4 (V)	average value (V)
without chamber	2.13	2.21	2.17	2.14	2.45	2.295
chamber of 300 mm width	2.34	2.63	2.485	2.81	2.64	2.725
chamber of 500 mm width	1.74	1.89	1.815	1.84	1.51	1.675
chamber of 800 mm width	1.64	1.71	1.675	0.56	0.47	0.515