Pulsed Detonation Hydroramjet

Frolov, S.M.; Avdeev, K. A.; Aksenov, V. S.; Фролов, Ф. С.; Sadykov, I.A.; Шамшин, И. О.; Tukhvatullina, R. R.

doi:10.30826/icpcd201829

Cited by 3 publications

(5 citation statements)

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“…To obtain the gas pressure in the HPC at a level feasible for hydrojet propulsion (up to 6-8 MPa [1]), the HPC was filled by the stoichiometric acetylene-oxygen mixture, which was ignited and burned to rupture the bursting diaphragm. The initial pressure of the mixture in the HPC was P 0,HPC = 0.4-0.6 MPa.…”

Section: Single Shock Wave Propagation In Bubbly Watermentioning

confidence: 99%

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Interaction of Shock Waves with Water Saturated by Nonreacting or Reacting Gas Bubbles

et al. 2022

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A compressible medium represented by pure water saturated by small nonreactive or reactive gas bubbles can be used for generating a propulsive force in large-, medium-, and small-scale thrusters referred to as a pulsed detonation hydroramjet (PDH), which is a novel device for underwater propulsion. The PDH thrust is produced due to the acceleration of bubbly water (BW) in a water guide by periodic shock waves (SWs) and product gas jets generated by pulsed detonations of a fuel–oxidizer mixture. Theoretically, the PDH thrust is proportional to the operation frequency, which depends on both the SW velocity in BW and pulsed detonation frequency. The studies reported in this manuscript were aimed at exploring two possible directions of the improvement of thruster performances, namely, (1) the replacement of chemically nonreacting gas bubbles by chemically reactive ones, and (2) the increase in the pulsed detonation frequency from tens of hertz to some kilohertz. To better understand the SW-to-BW momentum transfer, the interaction of a single SW and a high-frequency (≈7 kHz) sequence of three SWs with chemically inert or active BW containing bubbles of air or stoichiometric acetylene–oxygen mixture was studied experimentally. Single SWs and SW packages were generated by burning or detonating a gaseous stoichiometric acetylene–oxygen or propane–oxygen mixture and transmitting the arising SWs to BW. The initial volume fraction of gas in BW was varied from 2% to 16% with gas bubbles 1.5–4 mm in diameter. The propagation velocity of SWs in BW ranged from 40 to 580 m/s. In experiments with single SWs in chemically active BW, a detonation-like mode of reaction front propagation (“bubbly quasidetonation”) was realized. This mode consisted of a SW followed by the front of bubble explosions and was characterized by a considerably higher propagation velocity as compared to the chemically inert BW. The latter could allow increasing the PDH operation frequency and thrust. Experiments with high-frequency SW packages showed that on the one hand, the individual SWs quickly merged, feeding each other and increasing the BW velocity, but on the other hand, the initial gas content for each successive SW decreased and, accordingly, the SW-to-BW momentum transfer worsened. Estimates showed that for a small-scale water guide 0.5 m long, the optimal pulsed detonation frequency was about 50–60 Hz.

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Section: Single Shock Wave Propagation In Bubbly Watermentioning

confidence: 99%

“…A novel type of underwater propulsion device for producing hydrojet thrust, referred to as the pulsed detonation hydroramjet (PDH), was proposed in [1]. This propulsion device is a flow-through pulsed detonation tube inserted in a flow-through water guide.…”

Section: Introductionmentioning

confidence: 99%

Interaction of Shock Waves with Water Saturated by Nonreacting or Reacting Gas Bubbles

et al. 2022

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“…2) [5], but at that time there were no interests in development of such propulsion system, so research on PDE were abandoned and reinitiated at the end of XX century [8][9][10]. Many PDE were developed in different laboratory [11][12][13][14][15][16][17][18][19][20][21], mostly in USA, Russia and China, and at the beginning of XXI century even experimental aircraft powered by PDE was built and tested by a team from the US Air Force Research Laboratory [12]. The engine for this aircraft (Fig.…”

Section: Research On the Pdementioning

confidence: 99%

Applications of the continuously rotating detonation to combustion engines at the Łukasiewicz - Institute of Aviation

Kawalec¹,

Perkowski²,

Łukasik³

et al. 2022

Combustion Engines

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In the paper short information about advantages of introduction of detonation combustion to propulsion systems is briefly discussed and then research conducted at the Łukasiewicz-Institute of Aviation on development of the rotating detonation engines (RDE) is presented. Special attention is focused on continuously rotating detonation (CRD), since it offers significant advantages over pulsed detonation (PD). Basic aspects of initiation and stability of the CRD are discussed. Examples of applications of the CRD to gas turbine and rocket engines are presented and a combine cycle engine utilizing CRD are also evaluated. The world's first rocket flight powered by liquid propellant detonation engine is also described.

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“…In [15][16][17][18][19][20][21][22][23], a new type of underwater propulsion engine was designed, manufactured, and tested, i.e., the pulse-detonation hydroramjet (PDH). The PDH is a detonation tube (DT) inserted into a submerged water guide (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…Thrust in the PDH is created by pulsed jets of a compressible aqueous medium (bubbly water), which is a mechanical mixture of water and gaseous detonation products of each previous cycle, outflowing through the nozzle under the action of a travelling shock wave and expanding detonation products. Numerical simulation and experiments [20][21][22][23] showed that the optimal gas content in the medium flowing through the water guide was 20-25%vol. With such a gas content, the maximum increase in the momentum of the outflowing jets was achieved, and the absolute velocity of the aqueous medium increased by 25-30 m/s compared to the velocity of the approaching water flow ahead of the water intake.…”

Section: Introductionmentioning

confidence: 99%

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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Pulsed Detonation Hydroramjet

Cited by 3 publications

References 0 publications

Interaction of Shock Waves with Water Saturated by Nonreacting or Reacting Gas Bubbles

Interaction of Shock Waves with Water Saturated by Nonreacting or Reacting Gas Bubbles

Applications of the continuously rotating detonation to combustion engines at the Łukasiewicz - Institute of Aviation

Pulsed Detonation Hydroramjet: Design Optimization

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