|Table of Contents|

Design and flow heat transfer of mini-channel Helium heatexchanger in combined engine(PDF)

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

Issue:
2021年02期
Page:
9-18
Research Field:
研究与设计
Publishing date:

Info

Title:
Design and flow heat transfer of mini-channel Helium heatexchanger in combined engine
Author(s):
ZHANG Jingxuan1; LI Guangxi 2; NAN Xiangyi 2; MA Yuan 2; TANG Guihua 1
1MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China; 2Xi'an Aerospace Propulsion Institute, Xi'an 710100, China
Keywords:
helium heat exchanger;  convection heat transfer;  flow resistance;  numerical simulation;  structure design
PACS:
TK124
DOI:
-
Abstract:
Helium heat exchanger is one of the most important heat exchangers in Pre-Cooled Combined Engine. Helium heater exchanger can improve the working capacity of helium by utilizing the heat of gas to maintain system circulation. Firstly, three novel types of mini-channel heat exchangers with serpentine structures, tiled structures and radial structures were designed in this paper. Then, the flow and heat transfer performance of the novel micro-channel heat exchanger was analyzed based on the commercial software FLUENT15.0. The calculation formulas suitable for flow and heat transfer inside and outside tube of the mini-channel helium heater exchanger were examined by comparing simulation results with existing correlations. The results show that for the tube-inside, the existing classical correlations can calculate both convection heat transfer coefficient and flow resistance accurately with the average deviation below 8%. For the tube-outside, classical correlations can predict flow resistance accurately but the maximum deviation is close to 50% for the prediction of convection heat transfer coefficient in comparison with the simulation results. New correlations with average deviation less than 5% are fitted for tube-outside convective heat transfer of mini-channel helium heat exchanger. In addition, the proposed serpentine mini-channel helium heater exchanger achieves the highest convection heat transfer coefficient and comprehensive performance in the three heat exchangers.

References:

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