航空煤油RP-3热裂解结焦流动换热特性实验研究

潘辉; 冯松; 刘朝晖; 毕勤成

doi:10.7652/xjtuxb201607002

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航空煤油RP-3热裂解结焦流动换热特性实验研究

更新时间：2025-07-09

- 航空煤油RP-3热裂解结焦流动换热特性实验研究
- Experimental Investigation on the Flow and Heat Transfer Characteristics of Aviation Kerosene RP-3 During Thermal Pyrolysis Coking
- 西安交通大学学报 2016年50卷第7期页码：7-12
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
  
  : 2015-11-16。作者简介: 潘辉(1991—),男,博士生;毕勤成(通信作者),男,教授。基金项目: 国家自然科学基金资助项目(21306147);中国博士后科学基金资助项目(2013M532044)
- DOI：10.7652/xjtuxb201607002
  中图分类号： TK124
- 网络首发：2016-07-10，
  
  纸质出版：2016
- 稿件说明：
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潘辉, 冯松, 刘朝晖, 等. 航空煤油RP-3热裂解结焦流动换热特性实验研究[J]. 西安交通大学学报, 2016,50(7):7-12.

Experimental Investigation on the Flow and Heat Transfer Characteristics of Aviation Kerosene RP-3 During Thermal Pyrolysis Coking[J]. 2016, 50(7): 7-12.
潘辉, 冯松, 刘朝晖, 等. 航空煤油RP-3热裂解结焦流动换热特性实验研究[J]. 西安交通大学学报, 2016,50(7):7-12. DOI： 10.7652/xjtuxb201607002.

Experimental Investigation on the Flow and Heat Transfer Characteristics of Aviation Kerosene RP-3 During Thermal Pyrolysis Coking[J]. 2016, 50(7): 7-12. DOI： 10.7652/xjtuxb201607002.

摘要

为了掌握超燃冲压发动机再生式热防护结构中结焦对传热的影响

在压力为3 MPa

质量流量为0.5 g·s

-1

热流密度分别为325、365和374 kW·m

-2

的实验条件下

对Φ3 mm×0.5 mm的高温合金钢管内航空煤油RP-3热裂解结焦过程的流动和换热特性进行了研究

并比较了结焦前后管内对流换热特性的差异。结焦过程中试验件压降出现了突然降低的现象

随着结焦反应的进行

试验件外壁面温度在逐渐降低。分析得知:结焦是不稳定的过程

伴随着结焦产物的沉积与脱落

壁面温度越高结焦速率越快; 结焦会在管道内壁形成多孔结构层

当近壁处流体温度接近或高于拟临界温度时

多孔层将会使超临界“拟沸腾”换热得到强化

然而当近壁处流体温度低于“拟沸腾”所需温度时

结焦层的热阻效应使传热发生恶化。

Abstract

The flow and heat transfer characteristics of aviation kerosene RP-3 during its pyrolysis coking in a Φ3 mm×0.5 mm high-temperature alloy steel tube were investigated to understand the influence of coking in the regenerative thermal protection structures of scramjet on heat transfer. Experiments were conducted at the pressure of 3 MPa

the mass flow rate of 0.5 g·s

-1

and the heat fluxes of 325

365 and 374 kW·m

-2

. The discrepancy of convection heat transfer characteristics in the tube before and after coking was discussed. It was found that there occurred an abrupt pressure drop in the test tube section during coking test and the external wall temperature was reduced gradually du

ring the thermal pyrolysis. These results revealed that coking was an unstable process with the coke depositing and removing. The coking rate would increase with the wall temperature. Coking might form porous surface on the inner wall of the tube

which would enhance the pseudo boiling heat transfer under the supercritical pressure condition when the temperature of the fluid near the wall was close to or higher than the pseudo critical temperature. However

when the temperature of the fluid near the wall was too low to maintain pseudo boiling

a heat transfer deterioration would occur because of the thermal resistance effect of the coking layer.

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references

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