Effects of Floating-Ring Seal Clearance on the Pump Performance for Turbopumps

Choi, Changho; Noh, Jun-Gu; Kim, Dae-Jin; Hong, Soon-Sam; Kim, Jinhan

doi:10.2514/1.36806

Cited by 18 publications

(10 citation statements)

References 11 publications

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“…20 The authors used the method in previous studies to calculate the flow in inducers, and the method shows a good agreement with the experiments. 16,18 The method uses an explicit Runge-Kutta scheme and second-orderaccurate central-difference scheme with artificial dissipation for integration in time and space. The k-" turbulence model with an extended wall function is used to simulate the turbulence effects.…”

Section: 8mentioning

confidence: 99%

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Study on inducer and impeller of a centrifugal pump for a rocket engine turbopump

Hong

Kim

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part C:

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A hydraulic performance test is conducted for a fuel pump of a liquid rocket engine turbopump. The pump driven by an electric motor is tested in a water environment. Experimental results indicate that the inducer has a negligible effect on the head and efficiency of the pump but a significant effect on the cavitation performance. Additionally, an autonomous inducer test is carried out to investigate the effect of the inducer on the pump performance in more detail, and it is found out that the pump reaches a critical cavitation point when the inducer head is dropped by 55%. A reduction of required net positive suction head of the centrifugal pump by attachment of an inducer is also calculated considering the flow interference between the inducer and the centrifugal impeller, and it is found that the calculation shows a reasonable agreement with the test.

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Section: 8mentioning

confidence: 99%

“…Hydraulic and cavitation tests for the pump are conducted in a pump test facility, 15,16 where the pump is driven by an electric motor ( Figure 3). The working fluid is water at room temperature and measurement parameters are pump head, flow rate, power, efficiency, etc.…”

Section: Pump Performance Test Facilitymentioning

confidence: 99%

Study on inducer and impeller of a centrifugal pump for a rocket engine turbopump

Hong

Kim

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…In real cases, flow recirculation through the secondary passage from impeller outlet to inducer casing makes the impeller to operate at higher flow rate. Therefore, the flow rate through the impeller was underestimated by 4.5% 16 in the simulation and it connected to over-prediction of the head rise. In addition, the volute after the impeller dissipates dynamic pressure during the pressure recovery process, so it involves a large amount of head loss.…”

Section: Numerical Resultsmentioning

confidence: 88%

“…In addition, the efficiency can be even lowered by the leakage from secondary passages and the friction between the impeller and the casing (disk friction). Each value can be estimated by the flow rate through the secondary passage 16 and disk efficiency in the previous study on a turbopump. 8 Although minor losses and efficiency change in off-design conditions were left out of consideration, the efficiency values corrected by considering the volute, leakage, and disk efficiencies (93.6%, 91.7%, 93.8%) were consistent with the experimental data.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Although secondary passages were not considered in this study, the flow rate at the outlet was complemented by 104.5% of the original flow rate to consider the insertion of recirculated flow to inducer inlet. 16 However, another insertion to inducer casing was neglected. Periodic conditions were given at the boundary surfaces in the circumferential direction and the mixing plane method was adopted at the inducer/impeller interface to use single passages in the simulation.…”

Section: Boundary Conditionsmentioning

confidence: 99%

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Effects of inducer tip clearance on the performance and flow characteristics of a pump in a turbopump

Kim

Choi

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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A turbopump is used to pressurize propellants to gain high thrust in a projectile and consists of two pumps and a turbine. The pumps usually employ an inducer upstream to prevent performance deterioration by lowering net positive suction head required of the main impeller. However, several types of cavitation and instabilities take place in the flow field. Therefore, numerous experiments and CFD analysis for turbopumps have been conducted. Especially, there were some previous studies on inducer tip clearance, but they were limited to inducer regions due to the complexity of simulating the entire pump. In this study, the flow through an oxidizer pump in a turbopump was numerically investigated with four different sizes of inducer tip clearances. ANSYS CFX 13.0 with Rayleigh–Plesset equation was used to test flows in both non-cavitating and cavitating conditions. In the non-cavitating condition, the pump with the largest inducer tip clearance showed the worst head rise, efficiency and huge size of backflow arose near inducer casing. Also, the vortex was generated between the inducer blades in the case of large inducer tip clearance due to weak tip leakage flow. In the cavitating condition, the inducer with large tip clearance was found to be vulnerable to low suction pressure and floating cavity was observed between the inducer blades. However, the heads of the pumps with different inducer tip clearances were broken down at similar cavitation numbers due to the blade cavitation near the impeller throat. In addition, the transferred cavity from the inducer region also induced head breakdown of the pump.

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Research on influence of wear ring clearance on energy loss of reactor coolant pump

Long,

Zhou,

Yuan

et al. 2024

Annals of Nuclear Energy

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Effects of Floating-Ring Seal Clearance on the Pump Performance for Turbopumps

Cited by 18 publications

References 11 publications

Study on inducer and impeller of a centrifugal pump for a rocket engine turbopump

Study on inducer and impeller of a centrifugal pump for a rocket engine turbopump

Effects of inducer tip clearance on the performance and flow characteristics of a pump in a turbopump

Research on influence of wear ring clearance on energy loss of reactor coolant pump

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