|Table of Contents|

Design of the hole-pattern/honeycomb seals in the high-pressure liquid oxygen turbopump(PDF)

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

Issue:
2021年02期
Page:
47-53
Research Field:
研究与设计
Publishing date:

Info

Title:
Design of the hole-pattern/honeycomb seals in the high-pressure liquid oxygen turbopump
Author(s):
MAO Kai; LI Changhuan; ZHANG Dan; AN Kang
Xi'an Aerospace Propulsion Institute, Xi'an 710100, China
Keywords:
liquid oxygen turbopump;  hole-pattern/honeycomb seal;  optimization design;  sealing performance
PACS:
V434.21
DOI:
-
Abstract:
To reduce the leakage flow rates and improve the operation efficiency of the turbopump, as the replacement sealing scheme of the conventional labyrinth seal, the hole-pattern seal and honeycomb seal were designed and optimized for the front and rear shoulder rotating seals of the high-pressure liquid oxygen turbopump in a liquid rocket engine.The present numerical method based on the RNG k-ε turbulence model and steady RANS solutions were validated by comparisons to experiment data of leakage flow rates of a water-fed hole-pattern seal at different rotational speeds.The influences of the hole depth and hole diameter on the leakage performance of the hole-pattern and honeycomb seals were numerically investigated, and comparisons to the conventional labyrinth seal were also presented.The leakage flow rates were computed for the hole-pattern seal with continuously variable hole depth(0.1～2.0 mm)at eight hole diameters(0.3～2.0 mm).The results show that with the same hole geometry parameters(depth and diameter), the hole-pattern seal and the honeycomb seal possess the similar sealing performance which are both better than the conventional labyrinth seal.With the constant seal axial length, the leakage flow rates of the hole-pattern/honeycomb seals firstly decrease and then increase with the increasing hole diameter whose optimum value is 1.4 mm in this paper.For all the hole diameter cases, the hole-pattern/honeycomb seal possess the optimum ratio of the hole depth to diameter 0.5, where the best sealing performance were obtained.Compared to the conventional labyrinth seal, the leakage flow rates through the front and rear rotating seals of the high-pressure liquid oxygen turbopump were reduced by about 19% and 21% respectively, when the optimized hole-pattern/honeycomb seal were introduced.

References:

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