Experimental investigation of near-limit gaseous detonations in small diameter spiral tubing

Investigation of near-limit detonation propagation in a tube with helical spiral

“…In general, when limits are approached, the detonation velocity deficit increases and the unstable cellular structure is driven to lower unstable modes, i.e., from a multi-headed structure to a single-headed spin. At the limits, a spectrum of unstable phenomena can generally be observed where the combustion wave propagation becomes increasingly unsteady accompanying by large velocity fluctuations [10][11][12][13]. The limit phenomenon is complex, involving losses and the effects of instability.…”

Effects of inert gas jet on the transition from deflagration to detonation in a stoichiometric methane-oxygen mixture

“…In recent years, there is an increasing interest in developing detonation-based engines, such as Pulsed or Rotating Detonation Engines (PDEs or RDEs) for hypersonic propulsion applications [1][2][3]. One of the major challenges in designing these propulsive systems is the capability to initiate a detonation in a chamber of limited size [4][5][6], wherein the detonation propagation limits are a key as well as the fundamental problem for maintaining the propagation of detonations without failure to sustain their propulsion trust [7][8][9], this topic has been widely investigated as the detonations propagate though obstacles in recent years by Zhang et al [10][11][12] , Cao et al [13] and Gao et al [14][15][16].…”

Velocity fluctuation and cellular structure of near-limit detonations in rough tubes

“…Substantial studies have been carried in recent decades to investigate the steady velocity deficits near the limits, e.g., [5][6][7][8][9][10][11][12][13][14][15]. In addition, a spectrum of instability phenomena near limits have been revealed by a number of investigations [16][17][18][19][20][21][22][23][24][25][26][27]. Despite extensive studies on detonation limits, the failure mechanism remains obscure.…”