Deflagration-to-Detonation Transition in Air Mixtures of Polypropylene Pyrolysis Products

Фролов, С. М.; Звегинцев, В. И.; Aksenov, V. S.; Билера, И. В.; Kazachenko, V. M.; Шамшин, И. О.; Gusev, P. A.; Belotserkovskaya, M. S.

doi:10.1134/s0012501619090045

Cited by 3 publications

(8 citation statements)

References 9 publications

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“…Experiments are performed on the test bench ( Figure 1) described in detail in [23][24][25]. The test bench includes a standard pulsed detonation tube (PDT), thermostatic gas generator (GG), air supply system, mixer, control devices, ignition system, measuring probes and sensors, and data acquisition system.…”

Section: Detonability Of Polyethylene Pyrolysis Products In Air 21 mentioning

confidence: 99%

“…The total length of the PDT is about 5 m. The length of the measuring section is increased as compared to [23][24][25]: instead of 12 (see Figure 3 in [22]), 18 measuring stations are used, in which high-frequency pressure sensors (PS, PCB 113b24) and/or ionization probes (IP) are installed. Compared with [23][24][25], the design of the GG is also changed ( Figure 3): instead of a massive insert, it applies a massive bottom with a spherical recess, and an additional thermocouple is used for measuring the temperature of the pyrogas at the outlet from the GG. Besides, an additional electromagnetic valve (EMV) is installed in the fuel main to control the supply of pyrogas in the mixer.…”

Section: Detonability Of Polyethylene Pyrolysis Products In Air 21 mentioning

confidence: 99%

“…The purpose of this work is to continue the studies started by Frolov et al in [23][24][25] and to study the detonability of FAMs based on gaseous products of PE pyrolysis (hereinafter referred to as pyrogas) implying their application in advanced solid-fuel DRs operating on SCMs with a low melting point. The scientific novelty of the research outlined in this paper lies in the fact that the objects of this study are multicomponent pyrolysis gases of realistic composition.…”

Section: Introductionmentioning

confidence: 99%

“…In [23,24], a new approach for evaluating the detonability of fuel-air mixtures (FAMs) based on the measured values of the deflagration-to-detonation transition (DDT) run-up distance and time in substantially identical thermodynamic and gasdynamic conditions is proposed. It is confirmed that this method is applicable to both gaseous mixtures and air suspensions of liquid or solid fuels.…”

Section: Introductionmentioning

confidence: 99%

“…Systematic experimental studies on the ranking of gaseous FAMs based on hydrogen, acetylene, ethylene, propylene, propane-butane, n-pentane and natural gas of different compositions (from extremely fuel lean to extremely fuel rich) in terms of their detonability at normal temperature and pressure conditions are reported in [25]. When comparing the results of [23,24] and [25], it turns out that the detonability of gaseous products of PP pyrolysis in air is comparable to that of homogeneous propylene-air mixtures with the same equivalence ratio Φ.…”

Section: Introductionmentioning

confidence: 99%

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Polyethylene Pyrolysis Products: Their Detonability in Air and Applicability to Solid-Fuel Detonation Ramjets

et al. 2021

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The detonability of polyethylene pyrolysis products (pyrogas) in mixtures with air is determined for the first time in a standard pulsed detonation tube based on the measured values of deflagration-to-detonation transition run-up time. The pyrogas is continuously produced in a gas generator at decomposition temperatures ranging from 650 to 850 °C. Chromatographic analysis shows that at a high decomposition temperature (850 °C) pyrogas consists mainly of hydrogen, methane, ethylene, and ethane, and has a molecular mass of about 10 g/mol, whereas at a low decomposition temperature (650 °C), it mainly consists of ethylene, ethane, methane, hydrogen, propane, and higher hydrocarbons, and has a molecular mass of 24–27 g/mol. In a pulsed detonation mode, the air mixtures of pyrogas with the fuel-to-air equivalence ratio ranging from 0.6 to 1.6 at normal pressure are shown to exhibit the detonability close to that of the homogeneous air mixtures of ethylene and propylene. On the one hand, this indicates a high explosion hazard of pyrogas, which can be formed, e.g., in industrial and household fires. On the other hand, pyrogas can be considered as a promising fuel for advanced propulsion powerplants utilizing the thermodynamic Zel’dovich cycle with detonative combustion, e.g., solid-fuel detonation ramjets. In view of it, the novel conceptual design of the dual-duct detonation ramjet demonstrator intended for operation on pyrogas at the cruising flight speed of Mach 2 at sea level has been developed. The ramjet demonstrator has been manufactured and preliminarily tested in a pulsed wind tunnel at Mach 1.5 and 2 conditions. In the test fires, a short-term onset of continuous detonation of ethylene was registered at both Mach numbers.

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Section: Detonability Of Polyethylene Pyrolysis Products In Air 21 mentioning

confidence: 99%