|Table of Contents|

Investigations on the scheme design and performance evaluation of the hole-pattern damper seal in a liquid hydrogen turbopump(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2022年02期
Page:
105-116
Research Field:
目次
Publishing date:

Info

Title:
Investigations on the scheme design and performance evaluation of the hole-pattern damper seal in a liquid hydrogen turbopump
Author(s):
LI Zhigang1; AN Yang2; YE Xiaoqiang2
(1.Institute of Turbomachinery, School of Energy and Power Engineering, Xian Jiaotong University,Xian 710049, China 2.Beijing Aerospace Propulsion Institute, Beijing 100076, China)
Keywords:
liquid hydrogen turbopump hole-pattern seal multi-frequency rotor whirling model transient CFD perturbation numerical method leakage characteristics rotordynamic characteristics
PACS:
V434.21
DOI:
-
Abstract:
To solve the rotor vibration instability induced by the fluid-response forces of the inter-stage labyrinth seal in a liquid hydrogen turbopump, investigations on the scheme design of the hole-pattern seal were carried, as well as the performance evaluation of the seal leakage and rotordynamic characteristics.Total 25 seal schemes were designed for the liquid hydrogen hole-pattern seal, by the combination of various sealing clearances, hole diameters and hole depths.The effects of sealing clearance, hole diameter and hole depth on the seal leakage characteristics were calculated and discussed for the liquid hydrogen hole-pattern seal, using a steady CFD(computational fluid dynamics)numerical method.The effects of hole diameter and hole depth on the seal rotordynamic characteristics also were predicted and analyzed for the liquid hydrogen hole-pattern seal, using a transient CFD perturbation numerical method based on the multi-frequency one-dimensional rotor whirling model, the mesh deformation technique and the identification method of the rotordynamic force coefficients in frequency domain.Results show that there is a critical value for the ratio of hole depth to the hole diameter(H/D approaches to 0.5)where the liquid hydrogen hole-pattern seal possesses the least leakage flow rate.The hole depth has a very weak influence(less than 4.5)on the leakage flow rate of the liquid hydrogen hole-pattern seal when H/D<0.5.The liquid hydrogen hole-pattern seal with the larger hole diameter generates the smaller effective stiffness.The liquid hydrogen hole-pattern seal with the shallower hole depth generates the smaller effective stiffness and the larger effective damping.Comprehensively considering the seal leakage and rotordynamic characteristics, for the liquid hydrogen hole-pattern seal, it is better to choose the smaller sealing clearance,the larger hole diameter and the shallower hole depth with H/D<0.5.

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Last Update: 1900-01-01