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research-article

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 District, Xi'an City, Shaanxi Province, China
ybf1000@qq.com

Bin Li

Academy of Aerospace Propulsion Technology, No. 269 Jitai Road, Changan District, Xi'an City, Shaanxi Province, China
casclibin@vip.sohu.com

Hui Chen

Science and Technology on Liquid Rocket Engine Laboratory, No. 289 Feitian Road, Changan District, Xi'an City, Shaanxi Province, China
chenhui2013abc@163.com

Zhanyi Liu

Science and Technology on Liquid Rocket Engine Laboratory, No. 289 Feitian Road, Changan District, Xi'an City, Shaanxi Province, China
156904777@qq.com

Kaifu Xu

Xi'an Aerospace Propulsion Institute, No. 289 Feitian Road, Changan District, Xi'an City, Shaanxi Province, China
xukaifu067@163.com

1Corresponding author.

ASME doi:10.1115/1.4042160 History: Received August 29, 2018; Revised November 26, 2018

Abstract

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, 3D numerical simulation based on DES 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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