On the structures of compressible vortex rings generated by the compressible starting jet from converging and diverging nozzles

Qin, Liang; Xiang, Yang; Qin, Suyang; Liu, Hong

doi:10.1016/j.ast.2020.106188

Cited by 9 publications

(3 citation statements)

References 40 publications

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“…The advantages of the proposed method with previous works are as follows. Mainly, the structures of compressible vortex rings generated by the compressible starting jet from converging and diverging nozzles were studied in work [35]. However, that research does not allow the designing nozzles with an oblique-cut angle to ensure smooth flow twisting.…”

Section: Discussionmentioning

confidence: 99%

Flow Modeling in a Vortex Chamber of a Liquid–Steam Jet Apparatus

et al. 2022

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The article investigated the flow of boiling streams through a nozzle with an oblique cut. Due to this flow organization, deviation from the nozzle axis at the vortex chamber inlet occurred. The study of flow modeling in the inlet section was carried out. The flow design and the calculation scheme of the vortex liquid–steam jet apparatus were proposed. Analytical expressions between the main operating parameters were obtained according to the developed mathematical model. A recommended oblique-cut angle for the active-flow nozzle was evaluated considering the transition through the first critical section based on the tangential velocity flow model. Validation of the mathematical model in the inlet section of the vortex chamber was provided based on the comparison with available experimental data. Flow visualization in the inlet section of the vortex chamber was obtained. The assumption of uneven flow distribution was confirmed experimentally. Overall, the boiling liquid flow was implemented in the active flow nozzle. The obtained scientific and practical results help to determine geometric parameters and physical characteristics of the vortex-type liquid–steam jet apparatus at the design stage. The obtained results were implemented to modernize vacuum units based on vortex type liquid–steam jet apparatuses.

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Section: Discussionmentioning

confidence: 99%

Flow Modeling in a Vortex Chamber of a Liquid–Steam Jet Apparatus

et al. 2022

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“…To validate the proposed scheme, it is applied to process the low signal-to-noise ratio (SNR) and small spatial resolution (312×260-pixel) shadowgraph images from several supersonic starting jet tests [5,24]. The schematic diagram of the experimental setup is shown in Fig.…”

Section: A Facility and Experimental Setupmentioning

confidence: 99%

Automatic Shock Detection, Extraction, and Fitting in Schlieren and Shadowgraph Visualization

Kontis

Fan

2021

AIAA Journal

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“…A nowadays well-known physics class demonstration is presented, where a rather small thrust is observed in Helmholtz resonators comprised of Christmas tree spherical ornaments. The phenomenon is described as an "amusing and perhaps puzzling" Interestingly, bioinspired by sea creatures such as squids and salps, a propulsion system has been ben proposed for small water vehicles using jets produced by speaker coils as actuators (Thomas et al 2005, Dabiri 2009, Qin et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Acoustic and Thermoacoustic Jet Propulsion

2023

JAFM

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This manuscript bridges the fields of jet propulsion, synthetic jets and thermoacoustic engines. We introduce the case that synthetic jets in air can be considered a consistent approach for propulsion systems. To date, studies on synthetic jet propulsion have been scattered and rather subsidiary. Furthermore, investigating the perspective of propulsion can provide new insights into the field of synthetic jets and the physics of propulsion. In this work, synthetic jet propulsion in air is demonstrated and studied for acoustic and thermoacoustic cases. We developed synthetic jet systems and characterized the resulting propulsion regarding several relevant parameters such as geometric factors and the frequency and power of acoustic jets electromechanically and thermally produced. We demonstrated the 10.4-mN and 2.7-mN thrust in the acoustic and thermoacoustic modes, respectively, using compact tabletop assemblies. The physical mechanism of the jets has been modeled, simulated, verified with Schlieren imaging and laid in the perspective of adherent literature. Similarities and differences regarding traditional jet propulsion systems are discussed. Synthetic jet propulsion in air using a thermal cycle is experimentally demonstrated for the first time.

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On the structures of compressible vortex rings generated by the compressible starting jet from converging and diverging nozzles

Cited by 9 publications

References 40 publications

Flow Modeling in a Vortex Chamber of a Liquid–Steam Jet Apparatus

Flow Modeling in a Vortex Chamber of a Liquid–Steam Jet Apparatus

Automatic Shock Detection, Extraction, and Fitting in Schlieren and Shadowgraph Visualization

Acoustic and Thermoacoustic Jet Propulsion

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