Characterization of Oscillating Flow Heat Exchanger of the Thermoacoustic Engine

WANG Haitao; LUO Jing; ZHANG Limin; SUN Yanlei; CHEN Yuanhang; CHANG Depeng; CHEN Yanyan; YU Guoyao; LUO Ercang

doi:10.7652/xjtuxb202305010

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Characterization of Oscillating Flow Heat Exchanger of the Thermoacoustic Engine

更新时间：2025-07-09

- Characterization of Oscillating Flow Heat Exchanger of the Thermoacoustic Engine
- Vol. 57, Issue 5, Pages: 97-108(2023)
- 作者机构：
  
  1. 中国科学院理化技术研究所低温工程学重点实验室,北京,100190
  2. 中国科学院大学,北京,100049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202305010
  CLC： TK123
- Online First：10 May 2023，
  
  Published：2023
- 稿件说明：
移动端阅览
WANG Haitao, LUO Jing, ZHANG Limin, et al. Characterization of Oscillating Flow Heat Exchanger of the Thermoacoustic Engine[J]. 2023, 57(5): 97-108.
DOI：

WANG Haitao, LUO Jing, ZHANG Limin, et al. Characterization of Oscillating Flow Heat Exchanger of the Thermoacoustic Engine[J]. 2023, 57(5): 97-108. DOI： 10.7652/xjtuxb202305010.

摘要

为阐明热声发动机交变流动换热器内基本换热与阻力特性

以10 kW直线热管耦合自由活塞斯特林发电机的发动机核心为例

对三维模型进行等效

分别利用Sage一维和CFD二维模型两种方法

对交变流动换热单元在额定工况下的沿程基本状态参数、时均能量的分布特征进行计算并比较。结果表明:Sage一维模型中的换热分布特征及换热总量均与CFD二维模型计算结果相近

即Sage一维模型可以较好地捕捉换热器内的瞬态与时均特征; 同时

Sage一维模型对换热器界面的突变截面损失则与CFD二维模型计算差异较大

可利用CFD二维模型的阻力计算结果

提出采用有效压降与有效速度获得突变截面处的局部阻力系数修正

并添加修正因子后代入Sage一维模型

可使Sage一维模型的阻力特性与CFD二维模型的阻力特性基本吻合。所得热声热机中换热器特性规律及分析方法同样可用于指导其他热声热机的相关研究与工程设计

具有一定的普适性。

Abstract

In this paper

core engine components of a 10 kW free piston Stirling generator with a linear heat pipe coupled is taken as an example to illustrate the basic heat transfer and resistance characteristics of the oscillating flow heat exchanger of a thermoacoustic engine. By equating a 3D model

the Sage 1D model and CFD 2D model are adopted respectively to characterize the distribution of basic state parameters and time-averaged energy of the alternating flow heat transfer unit under rated operating conditions. The results show that the Sage 1D model is similar to the CFD 2D model in terms of the heat transfer distribution characteristics and the total amount of heat transfer calculated. The Sage 1D model can better capture the transient and time-averaged characteristics in the heat exchanger. However

the sudden cross-sectional losses at the heat exchanger interface calculated with the Sage 1D model deviate greatly from those calculated by the CFD 2D model. As a result

a local drag correction coefficient is proposed based on the resistance values calculated with the CFD 2D model

and according to the effective pressure drop and effective velocity at the abrupt cross-section. After the correction coefficient is used in the Sage model

the drag characteristics obtained using this model basically match those acquired using the CFD 2D model. The resultant heat exchanger characteristics and analysis method can be used to guide the research and engineering design of other thermoacoustic heat exchangers

exhibiting their general applicability.

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Keywords

references

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