The Influence of Rotating Speed on the Sealing Characteristics of a Liquid-Sealing Impeller for a Liquid Oxygen Turbopump

Zhuang, Suguo; Bao, Haifeng; He, Zhoufeng; Wang, Kai; Liu, Houlin

doi:10.3390/pr10071366

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…The turbopump is the core component of a rocket engine because it improves thrust by increasing the pressure of the rocket liquid propellant. Therefore, its reliability affects the overall performance of the rocket engine [3]. Turbopumps operate under extreme flow and pressure, and cavitation can easily occur owing to their strict design and operating conditions [4].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Li,

Zhu,

Zhang

et al. 2023

J Hydrodyn

View full text Add to dashboard Cite

show abstract

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

Zhu

Zhang

et al. 2023

Preprint

View full text Add to dashboard Cite

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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The Optimization of a First-Stage Liquid-Sealing Impeller Structure for a Turbopump Based on Response Surface Methodology

et al. 2022

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This study investigated the sealing performance of the multistage liquid-sealing impellers of a turbopump. To achieve this purpose, the influence of each structural parameter in the impeller on the pressurization coefficient φ2 and the leakage flow rate Q was analyzed based on response surface methodology, taking the maximum pressurization coefficient φ2 and the minimum leakage flow rate Q as the optimization objectives. We obtained satisfactory ranges for parameters φ2 and Q. A set of parameter combinations was selected as the optimization scheme using the Box–Behnken method for the optimal solution design. The numerical simulation results show that to keep φ2 and Q in the better range, the value ranges of groove width b, groove depth h and groove number z should be (12.8–14 mm), (4.5–5.6 mm) and (23.5–28), respectively. Compared with the original model, the optimized version has an average increase of about 2.5% in pressurization coefficient φ2 at each rotation speed, an average of about 8.2% reduction in the leakage flow rate Q in the leakage state and an average increase in the reverse flow rate Q by about 6.7% in the negative pressure sealing state, indicating better sealing. By comparing pressure data at the experimental monitoring points, the proposed method was verified to have a high degree of confidence.

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The Influence of Rotating Speed on the Sealing Characteristics of a Liquid-Sealing Impeller for a Liquid Oxygen Turbopump

Cited by 3 publications

References 7 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

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

The Optimization of a First-Stage Liquid-Sealing Impeller Structure for a Turbopump Based on Response Surface Methodology

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