Pulsed combustion of fuel–air mixture in a cavity above water surface: modeling and experiments

Фролов, С. М.; Platonov, S. V.; Avdeev, K. A.; Aksenov, V. S.; Иванов, В. С.; Zangiev, A. E.; Садыков, И. А.; Tukhvatullina, R. R.; Фролов, Ф. С.; Шамшин, И. О.

doi:10.1007/s00193-021-01045-3

Cited by 3 publications

(1 citation statement)

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“…m is the mass flow rate of the explosive mixture; g is the acceleration of gravity; S is the cross-sectional area of the water guide; indices 1 and 2 correspond to the beginning and end of the operation cycle; and F(t) is the PDH thrust. Both definitions of the specific impulse in Equation (1) were proved to provide close values for I sp [48]. The estimated error of the specific impulse determination by this formula was less than 10%.…”

Section: Cycle-to-cycle Variabilitymentioning

confidence: 72%

Pulsed Detonation Hydroramjet: Design Optimization

Фролов

Avdeev

Aksenov

et al. 2022

JMSE

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A new type of marine transportation engine, the pulsed detonation hydroramjet (PDH), which was first designed, manufactured, and tested by the present authors, has been further investigated in terms of the potential improvement of its propulsive performance. PDH is composed of a pulsed detonation tube (DT) inserted in the flow-through water guide. Thrust is developed by shock-induced pulsed water jets which are periodically emitted from the water guide nozzle. The measured values of the time-averaged thrust and specific impulse in the first operation cycle were shown to always be considerably higher than those in subsequent cycles, indicating the possibility of improving the overall thrust performance. The present manuscript is aimed at clarifying the reasons for, and eliminating, cycle-to-cycle variability during PDH operation, as well as optimization of the PDH design. An experimental model of the PDH with an optically transparent water guide was designed and manufactured. The cycle-to-cycle variability was found to be caused by the overexpansion of gaseous detonation products in the DT due to the inertia of water column in the water guide. Gas overexpansion caused the reverse flow of the gas–water mixture which filled the water guide and penetrated the DT, thus exerting a strong effect on PDH operation. To eliminate the cycle-to-cycle variability, a new PDH model was developed, manufactured, and tested. The model was equipped with a passive flap valve and active rotary valve and operated on the stochiometric propane–oxygen mixture. Its test firing showed that use of the valves made it possible to eliminate the cycle-to-cycle variability and nearly double the time-averaged thrust and specific impulse reaching 40 N and 550 s, respectively.

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Section: Cycle-to-cycle Variabilitymentioning

confidence: 72%