Experimental Study on the Forced Convection Heat Transfer Characteristics of Air Flow Across a Cylinder under Low Vacuum Pressures

doi:10.7652/xjtuxb201703008

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Experimental Study on the Forced Convection Heat Transfer Characteristics of Air Flow Across a Cylinder under Low Vacuum Pressures

更新时间：2025-07-09

- Experimental Study on the Forced Convection Heat Transfer Characteristics of Air Flow Across a Cylinder under Low Vacuum Pressures
- Vol. 51, Issue 3, Pages: 43-47+61(2017)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201703008
  CLC： V511.6
- Online First：10 March 2017，
  
  Published：2017
- 稿件说明：
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Experimental Study on the Forced Convection Heat Transfer Characteristics of Air Flow Across a Cylinder under Low Vacuum Pressures[J]. 2017, 51(3): 43-47+61.
DOI：

Experimental Study on the Forced Convection Heat Transfer Characteristics of Air Flow Across a Cylinder under Low Vacuum Pressures[J]. 2017, 51(3): 43-47+61. DOI： 10.7652/xjtuxb201703008.

摘要

为了研究低真空状态下空气横掠圆柱体强制对流传热特性

搭建了速度、压力可控的变密度风洞实验台和数据采集系统

得出了压力变化对气体传热特性的影响规律。实验研究表明:气体横掠圆柱体强制对流传热随压力降低而衰减

压力越低

传热衰减越快; 压力恒定时

传热随Re减小而减弱; 气体流态属于连续流或滑移流时

压力变化对传热影响很小

可直接采用传统经验关联式计算

推荐Hilpert关联式; 气体流态属于过渡流或自由分子流时

压力变化对传热影响很大

传统经验关联式已不再适用

需要修正。本实验不确定度小于4.5%

实验数据可靠

为工程实际应用提供了实验基础。

Abstract

When launch vehicles pass though near space(20～100 km)

the flow regimes of gas can go through continuum flow

slip flow

transition flow

and molecular free flow in sequence. In order to study the forced convection heat transfer characteristics of air flow across a cylinder under low vacuum pressures

an experimental rig of variable density wind tunnel and data acquisition system were set up. The influenced heat transfer characteristics of air flow were obtained. The experimental research showed that the forced convection heat transfer coefficient of air flow across a cylinder decreases with the decrease of pressure; and the lower the pressure

the faster the attenuation of heat transfer characteristics. The heat transfer intensity attenuates as Reynolds number decreases at a constant pressure. The pressure change has slightly effect on heat transfer at continuum flow or slip flow

and Hilpert's correlation is recommended. The pressure change has great influence on heat transfer at transition flow or molecular free flow

and conventional empirical correlations are no longer applicable

needing correction. The experimental uncertainty is less than 4.5%

which indicates the experimental data are reliable and can be used to guide engineering applications.

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Keywords

references

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