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Detonation of Gaseous Mixtures
Published in Kenneth M. Bryden, Kenneth W. Ragland, Song-Charng Kong, Combustion Engineering, 2022
Kenneth M. Bryden, Kenneth W. Ragland, Song-Charng Kong
High detonation speeds (Table 8.1) have motivated advanced propulsion devices known as detonation engines. Imagine that a tube is closed at one end and open at the other; the combustible mixture is ignited at the closed end. If the transition to detonation is successful, a detonation wave will rapidly travel across the tube and consume the mixture. The combustion products will then exit the open end at a supersonic speed, generating an enormous reactive force to propel the tube. Such propulsion devices have critical applications in the aerospace and defense industries. These detonation engines generally include the pulse detonation engine (PDE) and the rotating detonation engine (RDE).
Numerical Study of the Detonation Structure in Rich Acetylene-Air Mixtures
Published in Combustion Science and Technology, 2022
As a fuel-efficient combustion method, detonation is the main combustion process in the oblique detonation engine and the rotating detonation engine. Acetylene has become an important fuel for gas-phase detonation propulsion equipment and experiments because of its extreme instability. However, acetylene and oxygen can not only form self-sustained detonation under stoichiometric conditions, but also maintain the detonation under oxygen-lean or oxygen-free conditions. Understanding the propagation of the acetylene-rich detonation process plays an important role in the combustion efficiency of actual gas phase fuel (Mikhalchenko and Nikitin 2020), material preparation (Martin, Salamanca, and Kraft 2022; Shtertser et al. 2020), human health effects (Premnath et al. 2021) and astrophysical explosion process (Poludnenko et al. 2019).
Experimental Investigation of Kerosene Droplet Distribution in a Linearized Rotating Detonation Engine
Published in Combustion Science and Technology, 2022
Hao Liu, Feilong Song, Di Jin, Zhao Yang, Shida Xu, Xingkui Yang
Improving the combustion efficiency through detonation is a key topic in applied propulsion research (Wolański 2013), and technology of pulse detonation engine, oblique detonation engine and rotating detonation engine (RDE) (Miao, Zhou Liu et al. 2018; Phylippov, Dushin Nikitin et al. 2012; Rankin, Fotia Naples et al. 2017) have been developed to fulfill this requirement. The RDE is made up of a basic framework with an annular combustor. The detonation wave can be stabilized at a frequency of greater than 1000 Hz (Ma, Luan Xia et al. 2020). Furthermore, an RDE supplied with liquid kerosene (RP-3) that has advantages such as convenient storage and high energy density for use as a propellant, is suitable for practical engineering applications (J-M, Chang Li et al. 2018). The atomization and mixing process according to the size characteristics of the liquid droplets is the key to a stable self-sustaining rotating detonation wave (Fujii, Kumazawa Matsuo et al. 2017; Lu and Braun 2014).
Analytical and numerical study of the expansion effect on the velocity deficit of rotating detonation waves
Published in Combustion Theory and Modelling, 2020
Mingyi Luan, Shujie Zhang, Zhijie Xia, Songbai Yao, J.-P. Wang
Detonation is a premixed combustion mode; the shock wave and following reaction zone form the detonation wave. Compared with deflagration, detonation generates lower entropy and thus has higher efficiency. One way to use detonation for propulsion is with the rotating detonation engine (RDE). The potential thermodynamic advantages of detonation make RDEs one of the most promising propulsion systems for use in aircraft and rocket engines. The basic concept of RDEs was first introduced by Voitsekhovskii [1] and research on RDEs are now being conducted in several laboratories around the world, including in Russia [2,3], Poland [4], the US [5,6], France [7,8], Japan[9] and China [10,11]. Furthermore, many initial numerical studies have been performed on topics such as the basic physics [12–14], detailed mechanism [15–17], thermodynamic analysis [18,19], and performance [16]. Moreover, theoretical studies have been performed to investigate RDEs, including some basic characteristics of detonation [20] and models to evaluate the flow field [21,22].