基于射流管延伸和声激励器集成的受限横流通道方阵射流冲击传热强化

doi:10.7527/S1000-6893.2026.33064

Abstract

Abstract:

A test investigation is performed to the convective heat transfer in a confined crossflow channel with a specific dimensionless height of 3， produced from a 2×2 square-array impinging jets with dimensionless pitches of 4. Particular focus is played on the heat transfer enhancement by using the passively extended jet pipes and the actively center-positioned synthetic jet in the continuous-jet square array， as well as their combination schemes. Square-array jet Reynolds number （Re） ranges from 3 000 to 10 000， and the synthetic jet acoustic actuator is driven at a fixed frequency of 250 Hz. Correspondingly， the synthetic jet velocity ratios （defined as the ratio of synthetic jet characteristic velocity to square-array jet ejecting velocity） are varied from 2.0 to 0.6. From the jet pipe extension， the dimensionless normal distance between jet outlet and targeting wall is adjusted in a range of 1–3. Within the scope of this study， the heat transfer enhancement roles are clearly illustrated. Under Re=3 000， the synthetic jet integration demonstrates a significantly stronger heat transfer augment role than the jet pipe extension， taking on dominant heat transfer enhancement mechanism in the combination scheme. With respect to the baseline situation （no synthetic jet integration and no jet pipe extension）， the area-averaged Nusselt number on a specified zone could be increased up to 200% when the crossflow velocity ratio （defined as the ratio of crossflow inlet velocity to square-array jet ejecting velocity） beyond 0.67. Whereas under Re=10 000， the jet pipe extension plays dominant heat transfer enhancement mechanism on the otherwise. the area-averaged Nusselt number could be increased up to 100% at crossflow velocity ratioof0.5 in relation to the baseline situation. Meanwhile， in the square array with the extended jet pipes， the role of synthetic jet integration is very faint. The most possibilities wherein the combination of synthetic jet integration and jet pipe extension could exhibit obviously its significance on heat transfer enhancement appear when both schemes display equivalent heat transfer augment roles. For instance， under Re=5 000 and crossflow velocity ratioranging from 0.6 to 0.8， the combination scheme shows an obviously further improvement on heat transfer enhancement， in related to the single scheme either in active or passive.

Key words: confined crossflow channel, square-array continuous jets, acoustic actuator, synthetic jet, extended jet pipe, convective heat transfer enhancement

CLC Number:

V235

Yuanwei LYU, Junwen TAN, Jianing MAO, Ge CHEN, Jingzhou ZHANG, Jingyang ZHANG, Yu FU, Fengming WANG. Heat transfer enhancement of square-array jet impingement in a confined crossflow channel by using extended jet pipe and integrated acoustic actuator[J]. Acta Aeronautica et Astronautica Sinica, 2026, 47(13): 533064.

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Re	3 000	5 000	7 000	10 000
R_SJ-CJ	2.00	1.2	0.86	0.6
R_CF-CJ	0.33	0.2	0.14	0.1
	0.67	0.4	0.29	0.2
	1.00	0.6	0.43	0.3
	1.33	0.8	0.57	0.4
	1.67	1.0	0.71	0.5

测试参数	典型值	不确定度
传热表面温度T_w/K	330	1.5
射流温度T_j/K	302	0.3
基板背面温度T_b/K	305	0.5
加热膜电压V/V	5.3	1%读数
加热膜电流I/A	33	1%读数
表面发射率ε_w	0.95	0.01
射流管直径d/mm	8	1.5%名义值
导热系数k/（W∙（m∙K）^-1）	0.026	2%名义值

Heat transfer enhancement of square-array jet impingement in a confined crossflow channel by using extended jet pipe and integrated acoustic actuator

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