Analysis on the Nozzle Flow with Heat Addition and Its Thermal Cycle Efficiency in Electrogasdynamics

doi:10.7652/xjtuxb201409012

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Analysis on the Nozzle Flow with Heat Addition and Its Thermal Cycle Efficiency in Electrogasdynamics

更新时间：2025-07-09

- Analysis on the Nozzle Flow with Heat Addition and Its Thermal Cycle Efficiency in Electrogasdynamics
- Vol. 48, Issue 9, Pages: 68-73(2014)
- 作者机构：
  
  1. 重庆大学低品位能源利用技术及系统教育部重点实验室,重庆,400030
  2. 重庆大学动力工程学院,重庆,400030
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201409012
  CLC： TK121
- Online First：10 September 2014，
  
  Published：2014
- 稿件说明：
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Analysis on the Nozzle Flow with Heat Addition and Its Thermal Cycle Efficiency in Electrogasdynamics[J]. 2014, 48(9): 68-73.
DOI：

Analysis on the Nozzle Flow with Heat Addition and Its Thermal Cycle Efficiency in Electrogasdynamics[J]. 2014, 48(9): 68-73. DOI： 10.7652/xjtuxb201409012.

摘要

为了提高电气体发电循环的热效率

在有回热的布雷顿循环基础上

对喷管中膨胀的气体进行加热

使循环过程尽量接近Ericsson循环。用CFD数值模拟的方法研究了有热添加的喷管流动

并分析了喷管加热对循环热效率的影响

提出了一种可以提高电气体发电循环热效率的方法。计算和分析结果表明:定热流加热条件下

延长喷管渐缩段和增大入口高度能有效提高喷管流体速度和温度; 受边界层的限制

壁面加热方式对主流区域影响不大

而内热源加热方式在主流区域效果明显; 将壁面和内热源加热方式结合能够有效地将热量添加到喷管气流中

并能提高循环热效率。

Abstract

In order to improve the thermal efficiency

the gas flow in a nozzle of the regenerative Brayton cycle was heated in the expansion process of gas

which can make the electrogasdynamic cycle process approach an Ericsson cycle. The flat Laval nozzle for the electrogasdynamic(EGD)converter was designed and optimized. The nozzle flow with heat addition was investigated through CFD simulation. With a constant flux on the wall

the nozzle with a longer converging section and higher entrance can effectively increase the gas flow velocity and temperature. Heat addition through nozzle wall has little impact on gas velocity and temperature in the regions around the centerline due to the effect of boundary layer. Whereas the inner heat source based heating can significantly increase the gas velocity and temperature in nozzle's central region. The combined heat addition mode of wall heating and inner heat source can effectively improve the thermal cycle efficiency.

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references

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