转子径长比对凸轮泵性能影响的数值模拟与试验

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Abstract The purpose of the paper is to reveal the influence of the rotor diameter-length ratio on the performance parameter of a kind of rotary lobe pump, to establish a quantitative relationship between the diameter-length ratio and the characteristic curve of the rotary lobe pump and to obtain the radial load distribution characteristics of the shaft system so as to provide a basis for the calculation of the shafting strength of the rotary lobe pump.Based on the FLUENT dynamic mesh and the RNG k-ε turbulence model, the numerical calculation of the 3D transient flow in the rotary lobe pump was carried out.The flow characteristics of rotary lobe pumps with six different kinds of diameter-length ratio were compared, and the influence of the diameter-length ratio on the radial exciting force of the pump rotor was revealed.The results show that the diameter-length ratio has a significant influence on the performance of the rotary lobe pump.With the increase of the diameter-length ratio, the flow pulsation gradually decreases, and the outlet flow increases first and then decreases.The magnitude and direction of the radial force are changed periodically with the rotation of the rotor.The force decreases with the increase of diameter-length ratio, and increases with the increase of pump outlet pressure, which is independent of rotational speed.When the diameter-length ratio is from 0.7 to 1.3, the average volume flows at the outlet reaches the peak area, and the flow pulsation amplitude at the pump outlet is the lowest, meanwhile, the rotor’s force state is better.The results provide a theoretical basis for selecting the diameter-length ratio of rotary lobe pumps.

Key words： rotary lobe pump diameter-length ratio radial exciting force flow pulsation numerical simulation

Received: 28 August 2018 Published: 28 April 2020

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	LI Yibin1
	GUO Dongsheng1
	TANG Yonglin2
	DU Jun1

Cite this article:

LI Yibin1,GUO Dongsheng1,TANG Yonglin2, et al. Effect of the rotor diameter-length ratio on the rotary lobe pump performance based on numerical simulations and experimental tests[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(9): 194-200.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I9/194

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