吕海彬, 耿丽萍, 徐鹏, 王玉刚, 周静伟. 不同占空比的双喷嘴狭缝冲击射流强化传热的数值模拟[J]. 空气动力学学报, 2017, 35(2): 229-233. DOI: 10.7638/kqdlxxb-2015.0041
引用本文: 吕海彬, 耿丽萍, 徐鹏, 王玉刚, 周静伟. 不同占空比的双喷嘴狭缝冲击射流强化传热的数值模拟[J]. 空气动力学学报, 2017, 35(2): 229-233. DOI: 10.7638/kqdlxxb-2015.0041
Lyu Haibin, Geng Liping, Xu Peng, Wang Yugang, Zhou Jingwei. Numerical simulation of heat transfer enhancement by double nozzles slot impingement jet with different duty cycle[J]. ACTA AERODYNAMICA SINICA, 2017, 35(2): 229-233. DOI: 10.7638/kqdlxxb-2015.0041
Citation: Lyu Haibin, Geng Liping, Xu Peng, Wang Yugang, Zhou Jingwei. Numerical simulation of heat transfer enhancement by double nozzles slot impingement jet with different duty cycle[J]. ACTA AERODYNAMICA SINICA, 2017, 35(2): 229-233. DOI: 10.7638/kqdlxxb-2015.0041

不同占空比的双喷嘴狭缝冲击射流强化传热的数值模拟

Numerical simulation of heat transfer enhancement by double nozzles slot impingement jet with different duty cycle

  • 摘要: 采用RNG k-ε模型并结合壁面函数对不同占空比的双喷嘴狭缝冲击射流强化传热进行数值模拟,以定性评价占空比对多喷嘴冲击射流强化传热的影响,通过计算分别得到了不同占空比、相位差以及射流频率条件下射流冲击传热的效果。研究表明:在相同的雷诺数和相位差θ为0°的情况下,由于非稳态冲击射流在相邻喷嘴之间的射流相互干扰比稳态的强,因而其在双狭缝情况下的传热性能低于稳态射流。与稳态射流的传热性能相比,相位差使相邻两喷嘴间的速度错开,且错开的速度无相互影响或者相互影响较小时,强化传热效果达到最好。在频率为0~100Hz之间,占空比为0.5时频率大于阈值50Hz的强化传热减弱,而占空比为0.25的传热效果受频率的影响较小。

     

    Abstract: The numerical simulation investigation is performed to evaluate qualitatively the effect of the duty cycle to heat transfer enhancement of the multi-nozzles impinging jet using RNG k-ε model combined with the wall function. Simulations are carried out with different duty cycles, phase differences and frequencies. The numerical results indicate that unsteady impingement jets heat transfer performance is lower than the steady impinging jets in the case of double slot impingement jets under the condition of the same Reynolds number and the phase difference θ of 0°, because the stronger unsteady impinging jet disturbance between adjacent nozzle jet than that of steady case. Compared to heat transfer characteristics of the steady jet, the phase difference of adjacent two nozzles staggers the velocity. When the stagger of velocity has no interactions or mutual influence is small, heat transfer enhancement achieves the best effect. Heat transfer performance with duty cycle of 0.5 is worse above the threshold frequency of 50Hz, while the effect of jet frequency on the heat transfer with a duty cycle of 0.25 is less than the former within the frequency of 0~100Hz.

     

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