Thermodynamic effects on the cavitation flow of a liquid oxygen turbopump

Li, Deyou; Ren, Zhipeng; Yu, Li; Gong, Ruzhi; Wang, Hongjie

doi:10.1016/j.cryogenics.2021.103302

Cited by 22 publications

(6 citation statements)

References 25 publications

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“…The variables related to the Richardson extrapolation method are listed in Table 2. The extrapolated relative errors of eext 21 and eext 32 were very small at 0.06648% and 0.05110%, respectively. All GCI uncertainties (GCIfine 21 and GCIfine 32 ) were less than 0.1%.…”

Section: Fig 3 Energy Coefficients For Different Node Numbersmentioning

confidence: 91%

Entropy production by dissipation effects and characteristic vortex evolution in a rocket turbopump

Li,

Zhu,

Zhang

et al. 2023

J Hydrodyn

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The relationship between entropy production and vortex evolution involves the efficiency and stability of rotating machinery. This study investigates the energy characteristics of a rocket turbopump, revealing the correlated mechanisms of the entropy production rate using dissipation effects and characteristic vortex evolution. Direct and turbulent dissipations and rigid and shear vorticity decomposition methods are utilized to analyze the correlation analysis of flow loss and characteristic vorticities in rotating machinery for the first time. With an increase in flow rate, the hydraulic loss of the dissipation effects and wall decrease by 60% and 38.3%, and proportions to the input energy decrease (from 13% to 8%) and remain stable (8%), respectively. The local entropy production rate using direct dissipation (EPDD) in the inducer-impeller is strongly related to shear entropy, and the correlated effect of total enstrophy on EPDD is weaker than that of shear vorticity, indicating that rigid enstrophy suppresses direct dissipation.The correlation between turbulent dissipation and rigid enstrophy is significantly weaker in the static flow passage of a turbopump owing to a weak rigid rotational effect. The correlation between the rigid enstrophy and local entropy production rate using turbulent dissipation (EPTD) gradually increases with increasing flow rate, reaching a medium correlation (the maximal correlated degree in the turbopump) and exhibiting rigid rotation effects on hydraulic loss.Moreover, the flow rate significantly affects the correlation (except for the diffuser) and the two characteristic vorticities reach the maximum at the designed flow rate owing to optimal efficiency and minimum hydraulic loss.

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Section: Fig 3 Energy Coefficients For Different Node Numbersmentioning

confidence: 91%

Entropy production by dissipation effects and characteristic vortex evolution in a rocket turbopump

Li,

Zhu,

Zhang

et al. 2023

J Hydrodyn

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“…For instance, in order to achieve higher thrust and specific impulses, cryogenic liquid fuel is commonly utilized as propellant in liquid-fueled rocket engines. The cavitation performance of turbine pumps employed for cryogenic fuel transportation directly impacts the overall propulsion performance and manufacturing costs of the engine [1,2]. In the offshore liquid cargo ship transportation system, cavitation occurrence in liquid cargo pumps can induce structural vibrations, noise, performance degradation, increased transportation costs, and compromised transportation safety.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Thermodynamic Effects on the Characteristics of Liquid Nitrogen Cavitating Flow around Hydrofoils

Fu,

Gao,

et al. 2023

Preprint

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The cavitation behavior of cryogenic liquids in the field of cryogenic engineering is distinct, showcasing fundamental differences from the cavitation behavior observed in ambient temperature water. Cavitation occurrence imposes severe limitations on the operational stability of cryogenic media transportation equipment, leading to safety concerns and increased manufacturing costs. Investigating the spatiotemporal characteristics of cavitation in cryogenic fluids holds significant value for both academia and engineering. The complexity of cavitation in cryogenic fluids primarily manifests through the coupled effects of thermodynamics, vortices, and bubbles during the cavitation process. In order to further explore the coupling mechanism, numerical simulations employing the Delayed Detached Eddy Simulation (DDES) turbulence model and Sauer-Schnerr cavitation model are conducted to validate the accuracy of the numerical calculations using the Hord experiment hydrofoil as a benchmark. Subsequently, the unsteady cavitation flow of liquid nitrogen around the NACA 0015 hydrofoil is simulated by the same numerical calculation method. The results indicate that the simulated results best coincide with experimental results when the bubble number density in the Sauer-Schnerr cavitation model reaches 108. The upstream development of the re-entrant jet under the driving force of inverse pressure gradient is the fundamental reason for the detachment of the primary cavitation zone. Under the same inflow cavitation number, the thermodynamic effect significantly inhibits the generation of bubbles and changes the range of the inverse pressure gradient, thus affecting the separation behavior of the primary cavitation zone.

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“…The high rotation speed and low inlet pressure make the turbopump prone to cavitation at the inlet [6]. In the aerospace industry, to improve the cavitation performance of the turbopump, it is common to install an inducer at the front of the turbopump [7]. The inducer (due to its characteristics of having long blade flow paths and small installation angles) has good cavitation performance and can work under certain cavitation conditions [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Unsteady Cavitating Flow and Its Instability in Liquid Rocket Engine Inducer

Wang

Feng

Liu

et al. 2022

JMSE

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To study instability in the unsteady cavitating flow in a liquid rocket engine inducer, visualization experiments of non-cavitating and cavitating flows inside a model inducer were carried out at different flow conditions. Visual experiments were carried out to capture the evolution of non-cavitating and cavitating flows in a three-bladed inducer by using a high-speed camera. The external characteristic performance, cavitation performance, and pressure pulsation were analyzed based on the observation of non-cavitation and cavitation development and their instabilities. Under non-cavitation conditions, the change of flow rate has a significant impact on the pressure pulsation characteristics in the inducer. The occurrence of cavitation aggravated the instability of the flow and caused the intensity of pressure pulsation at each measuring point to increase. This cavitation structure has strong instability, and the tail region is often accompanied by shedding cavitation clouds perpendicular to the blade surface.

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Thermodynamic effects on the cavitation flow of a liquid oxygen turbopump

Cited by 22 publications

References 25 publications

Entropy production by dissipation effects and characteristic vortex evolution in a rocket turbopump

Entropy production by dissipation effects and characteristic vortex evolution in a rocket turbopump

Study on the Influence of Thermodynamic Effects on the Characteristics of Liquid Nitrogen Cavitating Flow around Hydrofoils

Experimental Study on Unsteady Cavitating Flow and Its Instability in Liquid Rocket Engine Inducer

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