Numerical investigation on flow and heat transfer characteristics of pulsed jet impingement in a crossflow
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摘要:
针对横流中单股圆射流冲击模型开展数值研究，在特定的射流雷诺数（1×104）和不同的横流-射流速度比（0.1～0.4）和脉冲频率（20～200 Hz）下，阐释了脉冲激励对射流冲击表面传热特性的影响。研究结果表明：横流中脉冲射流冲击体现出以围巾涡为主体的瞬时涡结构；与稳定射流相比，脉冲射流沿流向偏转程度有显著的减弱，在大的横流-射流速度比下并未形成以肾形涡结构为主导的流动结构，显著提高了冲击靶面的表面传热；脉冲射流与横流的相干过程具有高度的复杂性，导致冲击靶面表面传热与脉冲频率、横流-射流速度比之间存在着复杂的变化关系，在本文的研究参数中，脉冲频率为100 Hz是一个相对较优的脉冲频率。
Abstract:A numerical study was performed in the present work for a single round-jet impingement in the crossflow, to illustrate the effects of pulsating excitation on flow and heat transfer characteristics of pulsed jet impingement under a fixed jet Reynolds number (1×104) and different crossflow-to-jet velocity ratios (0.1—0.4) and pulsating frequencies (20—200 Hz). The results showed that the scarf-vortex was of the featured vortical structure in the pulsed jet impingement in a crossflow. When compared with the steady jet, the flow deflection of pulsed jet toward the crossflow direction was obviously weakened. Even in a strong crossflow situation, the kidney-vortex-dominated flow structure in the steady jet impingement did not appear in the pulsed jet impingement. Consequently, the convective heat transfer on the target was effectively improved by using pulsed jet impingement in a stronger crossflow. Because of the complexity in the interaction between pulsed jet and crossflow, the convective heat transfer on impinging target was tightly associated with the pulsating frequency and crossflow-to-jet velocity ratio. In the present parameters, a relatively optimal pulsating frequency of 100 Hz was suggested.
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Key words:
- jet impingement /
- pulsed jet /
- crossflow /
- surface heat transfer /
- vortical structure
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图 3 稳定射流涡结构等Q面图（Q=0.1 s−2）
Figure 3. Vortical structure iso-surfaces of Q-criterion for steady jet （Q=0.1 s−2）
图 8 稳定射流冲击Nu沿流向分布
Figure 8. Nu distribution along streamwise direction under steady jet impingement
图 9 横流中脉冲射流冲击下瞬时涡结构变化图（M=0.2， f=20 Hz）
Figure 9. Instant vortical structure visualization under pulsed jet impingement in a crossflow （M=0.2， f=20 Hz）
图 10 横流中脉冲射流冲击下瞬时涡结构变化图（M=0.2， f=50 Hz）
Figure 10. Instant vortical structure visualization under pulsed jet impingement with in a crossflow （M=0.2， f=20 Hz）
图 11 横流中脉冲射流冲击下瞬时涡结构变化图（M=0.4， f=50 Hz）
Figure 11. Instant vortical structure visualization under pulsed jet impingement with in a crossflow （M=0.4， f=20 Hz）
表 1 M=0.1时NuA和峰值Nu
Table 1. NuA and peak Nu at M=0.1
频率 稳态 20 Hz 50 Hz 100 Hz 200 Hz NuA 18.2 19.1 21.0 21.9 20.9 峰值Nu 84.0 43.3 65.7 80.1 85.6 
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表 2 M=0.2时NuA和峰值Nu
Table 2. NuA and peak Nu at M=0.2
频率 稳态 20 Hz 50 Hz 100 Hz 200 Hz NuA 14.5 18.6 19.7 19.8 19.1 峰值Nu 59.3 41.19 58.1 69.1 77.7
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表 3 M=0.4时NuA和峰值Nu
Table 3. NuA and peak Nu at M=0.4
频率 稳态 20 Hz 50 Hz 100 Hz 200 Hz NuA 13.2 17.7 19.0 19.2 17.8 峰值Nu 19.7 29.9 49.3 61.2 57.7
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