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Research Papers: Flows in Complex Systems

Numerical Investigation of the Clocking Effect Between Inducer and Impeller on Pressure Pulsations in a Liquid Rocket Engine Oxygen Turbopump

[+] Author and Article Information
Baofeng Yang

Science and Technology on
Liquid Rocket Engine Laboratory,
No. 289 Feitian Road,
Changan,
Xi'an 710100, Shaanxi, China
e-mail: ybf1000@qq.com

Bin Li

Academy of Aerospace Propulsion Technology,
No. 269 Jitai Road,
Changan,
Xi'an 710100, Shaanxi, China
e-mail: casclibin@vip.sohu.com

Hui Chen

Science and Technology on
Liquid Rocket Engine Laboratory,
No. 289 Feitian Road,
Changan,
Xi'an 710100, Shaanxi, China
e-mail: chenhui2013abc@163.com

Zhanyi Liu

Science and Technology on
Liquid Rocket Engine Laboratory,
No. 289 Feitian Road,
Changan,
Xi'an 710100, Shaanxi, China
e-mail: 156904777@qq.com

Kaifu Xu

Xi'an Aerospace Propulsion Institute,
No. 289 Feitian Road,
Changan,
Xi'an 710100, Shaanxi, China
e-mail: xukaifu067@163.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 29, 2018; final manuscript received November 26, 2018; published online January 30, 2019. Assoc. Editor: Sergio Pirozzoli.

J. Fluids Eng 141(7), 071109 (Jan 30, 2019) (9 pages) Paper No: FE-18-1568; doi: 10.1115/1.4042160 History: Received August 29, 2018; Revised November 26, 2018

The clocking positions between the inducer and the impeller have a certain impact on the performance of the high-speed centrifugal pump, which however, is often ignored by designers. In the present study, three-dimensional numerical simulation based on detached eddy simulation method is adopted to evaluate the influence of this clocking effect on unsteady pressure pulsations in a full-scale liquid rocket engine oxygen turbopump. A new omega vortex identification method is introduced to clarify the internal correlation between unsteady flow structures and pressure pulsations and to shed comprehensive light on the formation mechanism of this clocking effect. Results show that the clocking effect has little influence on the unsteady pressure field in inducer passages while it significantly affects the rotor–stator interaction (RSI) effect leading to the alteration of the pressure spectra in RSI region, diffuser and volute diffuser pipe. The components at the inducer blade passing frequency in the pressure spectra are remarkably suppressed and the total pressure pulsation energy in these regions is decreased by an average of 13.94%, 12.94%, and 34.65%, respectively, when the inducer blade trailing edges are located in the middle of two adjacent impeller blades. The vortex analysis in the specific region reveals that the pressure pulsations in RSI region and the downstream regions are closely associated with the unsteady vortex shedding from the diffuser blades and the formation of the clocking effect is precisely due to different processes of the periodic vortex shedding from the diffuser blade pressure surfaces.

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Figures

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Fig. 1

Computational domain of the pump

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Fig. 2

The clocking position between inducer and impeller

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Fig. 3

Structured grids of the pump

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Fig. 4

Performance comparison between computational fluid dynamics (CFD) and experimental results

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Fig. 5

Pressure spectra of the monitoring point OD1: (a) CFD results with θ = 30 deg and (b) experimental results with θ = 30 deg

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Fig. 6

Pressure fluctuation intensity distribution at the midspan surface of inducer

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Fig. 7

Pressure fluctuation intensity distribution at the midspan surface of impeller, diffuser, and volute

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Fig. 8

Monitoring points arrangement in the pump

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Fig. 9

Pressure spectra of the monitoring points in impeller

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Fig. 10

Pressure spectra of the monitoring points in RSI region

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Fig. 11

Pressure spectra of the monitoring points in diffuser

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Fig. 12

Pressure spectra of the monitoring points in volute

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Fig. 13

The instantaneous vortex structures in impeller and diffuser at different clocking positions (colored by velocity): (a) θ = 0 deg and (b) θ = 30 deg

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Fig. 14

Evolution process of the vortices in RSI regions at clocking position θ = 0 deg and 30 deg (colored by velocity)

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