An experimental investigation was performed to determine critical semi-open channel height
(h*) and two-sided open channel width (w*) in which hydrogen-air detonation may
propagate. Three types of gaseous mixture composition were used: 25%, 29.6% and 40% of
hydrogen in air. Experimental setup was based on rectangular (0.11× 0.11× 2 m) test
channel equipped with acceleration section (0.11× 0.11× 1 m). Different channel heights h in
range of 15–40 mm and widths w in range of 30–50 mm were used in the test channel. The …

… Objectives: - Precisely define the critical height h* of semi-confined channel where stable
detonation may propagate in mixtures with various H2 concentration in air - Find the critical
critical relation h*/λ, where λ is the detonation cell size To obtain the described objectives
the following experimental plan was prepared: 1) … - The progressive increase in
detonation velocity deficit was observed (as h → h*) caused by the rapid expansion of the
combustion products in the bottom air-filled volume. Maximum …