Table 2. Experimental Investigation of Spontaneous Combustion of Hydrogen under Different Conditions.

no.	tube lengths (mm)	initial release pressure (MPa)	maximum shock speed (m/s)	photoelectric signal position	maximum flame tip speed (m/s)	ball flame diameter (m)
1	300	5.83	122	L2 + L3 + L4	34.16	1.43
2	300	7.08	1395	L2 + L3 + L4	48.77	1.75
3	700	5.30	1142	L2 + L3 + L4	40.12	1.51
4	700	6.03	1213	L2 + L3 + L4	40.67	1.75
5	1200	5.02	968	L2 + L3 + L4	30.64	1.49
6	1200	6.12	1172	L2 + L3 + L4	32.76	1.51
7	1700	3.70	1106	L3 + L4	32.08	1.48
8	1700	5.79	1281	L2 + L3 + L4	50.00	1.50
9	2200	7.86	1287	L2 + L3 + L4	49.36	1.83
10	2200	9.21	1450	L2 + L3 + L4	76.51	1.84