Experimental research on rotating detonation in liquid fuel–gaseous air mixtures

Numerical simulation of a Rotating Detonation with a realistic injector designed for separate supply of gaseous hydrogen and oxygen

“…A large amount of experimental work has been carried out with the objective to clearly identify these issues and prepare technological solu-10 tions. Different types of fuel and fuel-oxidizer mixtures have been tested, see for example [7,8,9,10,11]. In a first step, the rotating detonation is often studied in small combustion chambers but demonstration chambers are now in development or testing [12].…”

Continuous spin detonation of a heterogeneous kerosene–air mixture with addition of hydrogen

“…Purging of gaseous hydrogen through liquid kerosene made it possible to reduce the mass fraction of hydrogen in the two-phase fuel down to 8.4%, i.e., by more than three times as compared to [5]. The TDW structure in the examined heterogeneous fuel-air mixture is similar to that in the syngas-air mixture [6].…”

“…It was found that the critical diameter of CSD of the heterogeneous kerosene/hydrogen-air mixture at φ f ≈ 1, m H ≈ 10%, and g Σ > 500 kg/(s · m 2 ) can be reduced to d cr = 250 mm; moreover, at φ f ≈ 1, m H ≈ 20%, and g Σ > 550 kg/(s · m 2 ), the critical diameter can be reduced even more significantly: to d cr = 168 mm. It should be noted that the specific flow rates of the mixture at which the CSD regimes were obtained in the kerosene/hydrogen-air mixture are greater than those in [5] by an order of magnitude. …”

“…In a flow-type annular cylindrical combustor (a variant of an air-breathing engine) with a diameter d c1 = 306 mm, CSD of a mixture with liquid kerosene could be obtained only if air was enriched by oxygen with the mass ratio [O 2 ] : [N 2 ] = 1 : 1 [4]. The results on CSD in an annular combustor with a diameter d c1 = 168 mm for a heterogeneous mixture consisting of kerosene with 20% addition of isopropylnitrate, gaseous hydrogen, and air were reported in [5]. In this brief communication, we describe the results of experiments aimed at obtaining CSD in a two-phase kerosene-air mixture with addition of hydrogen in a flow-type annular cylindrical combustor 503 mm in diameter.…”

Effects of Diverging Nozzle Downstream on Flow Field Parameters of Rotating Detonation Combustor

“…The large scale chamber hampers the design of the experiment rig and imposes a huge burden on the numerical simulations. Therefore, in order to study the RDC with methane, many studies chose to add extra oxygen or hydrogen in the fuel to improve the chemical activity [26][27][28][29]. Besides, the minimum realization size of RDCs can be effectively reduced by increasing the initial pressure, as the detonation cell size is greatly affected by the initial pressure of the mixture [30][31][32][33][34].…”