|Table of Contents|

Analysis on working characteristics of balanced piston with groove structure for turbopump(PDF)

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

Issue:
2022年01期
Page:
45-52
Research Field:
研究与设计
Publishing date:

Info

Title:
Analysis on working characteristics of balanced piston with groove structure for turbopump
Author(s):
DANG Xiaorui; XU Kaifu; JIN Lu; HUANG Xilong
(Xi’an Arerospace Propulsion Iustitute,Xi’an 710100,China)
Keywords:
balanced piston;  groove structure;  numerical simulation;  pressure distribution;  flow characteristic;  sensitivity analysis
PACS:
V434.2
DOI:
-
Abstract:
The design of balanced piston structure in turbopump is one of the most important methods to balance the axial force. The balanced piston reduces the axial force by adjusting the pressure distribution between the impeller and shell,while adding a groove structure in the balanced piston can better balance the axial force and expand its working range. In view of the working characteristics of the groove structure,a numerical simulation model of the balanced piston with different grooves was established,and the pressure distribution,flow characteristics and sensitivity analysis of the balanced piston were analyzed based on the numerical simulation results. The numerical simulation results show that the increase of inlet and outlet axial velocity caused by the groove structure,which is the radial velocity of the rotating static cavity,leads to a decrease of the total flow resistance,an increase of the leakage flow,and an increase of the pressure drop at the labyrinth seal. In addition,the decrease of the angular momentum and tangential velocity of the fluid flowing through the groove structure is the main reason for the decrease of the radial pressure difference. The upper part of the groove structure plays a major role in balancing the axial force,while the lower part has no obvious effect on balancing axial force. Moreover,the axial force is sensitive to the change of the groove width,but the change of the groove depth has little effect on it.

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