Comparative Analysis of Steam Condensation Consisting of Air Outside of Single Tubes and Tube Bundles with Different Tube Diameters and Inclination Angles
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摘要: 为评估不同传热管结构参数下单管与管束外含空气蒸汽冷凝传热规律的差异，基于外径12~19 mm、倾角0°~90°的单管和3×3管束在压力0.2~1.6 MPa、空气质量份额12%~87%的参数范围内开展了试验研究。结果表明：不同压力范围内，管径和倾角对单管和管束的影响呈现不同的规律。在压力小于0.8 MPa时，管束冷凝传热受管径和倾角影响的规律与单管总体一致，两者的冷凝传热系数均随管径和倾角的减小而增大。在0.8~1.6 MPa时，管束冷凝传热受管径和倾角的影响与单管存在明显差异。结合不凝性气体影响蒸汽冷凝传热的机制对所呈现的一致性和差异性规律进行了分析。Abstract: In order to evaluate the difference of condensation heat transfer law between single tube and steam containing air outside the tube bundle under different heat transfer tube structural parameters, based on a single tube with an outer diameter of 12~19 mm, an inclination angle of 0°~90° and a 3 × 3 tube bundle, an experimental study was carried out in the range of pressure 0.2~1.6 MPa and air mass share 12%~87%. The results show that the influence of tube diameter and inclination angle on single tube and tube bundle shows different rules in different pressure ranges. When the pressure is less than 0.8 MPa, the condensation heat transfer of the tube bundle is affected by the tube diameter and inclination angle, which is the same as that of a single tube. The condensation heat transfer coefficients of both increase with the decrease of tube diameter and inclination angle. At 0.8~1.6 MPa, the condensation heat transfer of tube bundle is significantly different from that of single tube due to the influence of tube diameter and inclination angle. The law of consistency and difference is analyzed according to the mechanism of the effect of non-condensable gas on steam condensation heat transfer.
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Key words:
- Single tube /
- Tube bundle /
- Tube diameter /
- Inclination angle /
- Steam condensation /
- Non-condensable gas
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图 1 试验装置示意图
Tg—气空间温度测点；Tf—冷却水进出口温度测点；Gf—冷却水流量测点；Pg—压力传感器测点；Va、Vb、Vf、Vg—系统中的各类阀门；A~F—六个不同高度的截面
Figure 1. Schematic Diagram of the Test Device
图 2 不同热工参数下单管和管束冷凝传热对比
Figure 2. Comparison between Single Tube and Tube Bundle Condensation Heat Transfer at Different Thermal Parameters
图 3 低压下管径对单管和管束冷凝的影响
Figure 3. The Effect of Tube Diameter on Single Tube and Tube Bundle Condensation at Low Pressures
图 4 高压下管径对单管和管束冷凝的影响
Figure 4. The Effect of Tube Diameter on Single Tube and Tube Bundle Condensation at High Pressures
图 5 低压下倾角对单管和管束冷凝的影响
Figure 5. The Effect of Inclination Angle on Single Tube and Tube Bundle Condensation at Low Pressures
图 6 高压下倾角对单管和管束冷凝的影响
Figure 6. The Effect of Tube Diameter on Single Tube and Tube Bundle Condensation at High Pressures
表 1 不同压力条件下相对不确定度
Table 1. Relative Uncertainty under Different Pressure Conditions
压力/MPa 最大不确定度 最小不确定度 平均不确定度 0.15 0.215 0.101 0.158 0.20 0.146 0.054 0.089 0.40 0.076 0.038 0.050 0.60 0.065 0.035 0.043 0.80 0.058 0.035 0.042 1.00 0.052 0.034 0.040 1.30 0.045 0.034 0.038 1.60 0.042 0.034 0.037 
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