超临界压力碳氢燃料在增材制造通道中流动传热的实验研究

蔡磊; 肖颖; 韩怀志; 于瑞天; 罗文

doi:10.13700/j.bh.1001-5965.2023.0120

超临界压力碳氢燃料在增材制造通道中流动传热的实验研究

doi: 10.13700/j.bh.1001-5965.2023.0120

蔡磊¹,
肖颖²,
韩怀志^1, ,,
于瑞天¹,
罗文¹

1.
四川大学化学工程学院，成都 610065
2.
中国航发四川燃气涡轮研究院燃烧试验研究部，绵阳 621022

基金项目: 国家自然科学基金(T2441001)；四川省燃气轮机燃烧工程技术研究中心专项基金(JMRH-0000-2024-00001)

详细信息

通讯作者:
E-mail：hanhz@scu.edu.cn

中图分类号: V231.1；TK172
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出版历程
- 收稿日期: 2023-03-10
- 录用日期: 2023-04-04
- 网络出版日期: 2023-05-05
- 整期出版日期: 2025-03-27

Experimental study on flow and heat transfer of hydrocarbon fuels in additive manufacturing channels at supercritical pressure

1.
School of Chemical Engineering，Sichuan University，Chengdu 610065，China
2.
AECC Sichuan Gas Turbine Establishment，Mianyang 621022，China

Funds: National Natural Science Foundation of China (T2441001)；Special Fund of Sichuan Provincial Gas Turbine Combustion Engineering Technology Research Center (JMRH-0000-2024-00001)

More Information

Corresponding author: E-mail：hanhz@scu.edu.cn

摘要

摘要:
针对超临界压力正癸烷在增材制造（AM）粗糙通道与机械加工光滑通道中的流动和传热性能差异进行对比实验研究。采用粗糙度仪获得AM通道和光滑通道的表面平均粗糙度分别为11 μm和 3 μm。考察不同系统压力（3 MPa、5 MPa和7 MPa）和壁面热流密度（0.29 MW/m²、0.32 MW/m²和0.35 MW/m²）工况下，2种通道摩阻系数f和努塞尔特数Nu在不同流量下的变化规律。结果表明：在选定的流量范围内，AM通道的f和Nu皆大于光滑通道，AM通道的f是光滑通道的2.8～3.5倍，Nu是光滑通道的1.7～2.3倍；增大系统压力会使AM通道的f降低，但却使光滑通道增加，而Nu在AM和光滑通道皆降低；随着壁面热流密度增加，AM通道的f和Nu皆降低，而光滑通道皆增加；粗糙通道具有很好的综合传热性能，并且在小流量时效果更好，其综合传热系数为1.2～1.5；提出超临界碳氢燃料在增材制造通道中Nu和f的关联式。
- 粗糙度 /
- 增材制造 /
- 流动阻力 /
- 换热特性 /
- 实验研究
Abstract:
This article presents a comparative experimental study on the flow and heat transfer performance differences between additive manufacturing (AM) rough channels and machined smooth channels for supercritical pressure n-decane. Using a roughness gauge, the surface average roughness of the smooth channel and AM channel were determined to be 3 μm and 11 μm, respectively. The study investigated variations in the friction factor (f) and Nusselt number (Nu) of the two channels under different flow rates, system pressures (3 MPa, 5 MPa, and 7 MPa), and wall heat flux densities (0.29 MW/m², 0.32 MW/m², and 0.35 MW/m²). The results showed that, within the selected flow rate range, both f and Nu of the AM channel were higher than those of the smooth channel, with f being 2.8～3.5 times that of the smooth channel, and Nu being 1.7～2.3 times that of the smooth channel. Increasing the system pressure reduced f of the AM channel, but increased that of the smooth channel, while Nu decreased for both channels. As the wall heat flux density increased, both f and Nu of the AM channel decreased, while those of the smooth channel increased. The rough channel had a comprehensive heat transfer coefficient of 1.2～1.5, showing outstanding overall heat transfer performance and greater effectiveness at low flow rate. The correlations of the Nu and f of supercritical hydrocarbon fuel in additive manufacturing channel are proposed.
- roughness /
- additive manufacturing /
- friction loss /
- heat transfer characteristics /
- experimental study

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图 1 实验系统示意图

Figure 1. Schematic diagram of experiment setup

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图 2 测试段示意图

Figure 2. Schematic diagram of test section

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图 3 粗糙度测量示意图

Figure 3. Schematic diagram of measuring roughness

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图 4 不同系统压力下的Δp

Figure 4. Δp at various system pressure

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图 5 不同系统压力下的摩擦系数

Figure 5. Friction factor f change at various system pressure

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图 6 不同系统压力下的平均壁温

Figure 6. Average wall temperature at various system pressure

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图 7 不同系统压力下的Nu

Figure 7. Nu at various system pressure

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图 8 不同热流密度下的Δp

Figure 8. Δp at various heat flux densities

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图 9 不同热流密度下的摩阻系数

Figure 9. Friction factor at various heat flux densities

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图 10 不同热流密度下的平均壁温

Figure 10. Average wall temperature at various heat flux densities

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图 11 不同热流密度下的Nu

Figure 11. Nu at various heat flux densities

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图 12 综合传热效果对比

Figure 12. Comparison of integrated heat transfer characteristics

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图 13 超临界正癸烷在AM通道中努塞尔特数和摩阻系数预测值与实验值对比

Figure 13. The Nu and f in predicted of supercritical n-decane in the AM channel compared with experimental data

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表 1 直接测量误差

Table 1. Direct measurement error

仪器	直接测量参数	误差/%
直流电源	电压U	2.82
直流电源	电流I	1.64
压差计	压力差Δp	1.16
压力传感器	压力p	0.25
温度传感器	温度T	0.4
流量计	质量流量m	0.62

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表 2 间接测量误差

Table 2. Indirect measurement error

间接测量参数	误差/%
物性	0.47
流速	0.77
内壁温度T_i	3.28
对流换热系数h	6.72
摩阻系数f	1.46
努塞尔特数Nu	6.73

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