| 非稳态冲击射流强化传热试验研究 |
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| 引用本文： | 周静伟,杨兴贤,耿丽萍,王玉刚.非稳态冲击射流强化传热试验研究[J].机械工程学报,2010,46(6). |
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| 作者姓名： | 周静伟 杨兴贤 耿丽萍 王玉刚 |
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| 作者单位： | 中国计量学院计量测试工程学院,杭州,310018 |
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| 基金项目： | 国家自然科学基金(50676088);;浙江省钱江人才计划(2007R10030)资助项目 |
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| 摘 要： | 利用一个特殊的质量流量控制装置产生波形和频率可调的周期性变化非稳态射流,进行非稳态射流冲击换热性能的试验研究。研究采用正弦、三角形和矩形三种典型的周期性波形,频率变化范围为1.25～40Hz,其传热性能用传热强化系数(定义为相同流量下非稳态和稳态射流冲击时的努塞尔数之比)来描述。研究表明,在频率较低时非稳态的射流冲击换热效果反而没有稳定射流冲击时好,但当频率超过一阈值时,其强化传热的优势逐渐明显。传热强化的效果还与射流信号的变化规律有关,有阶跃变化的矩形射流强化传热最为有效,在频率为40Hz时传热强化效果可达30%以上,但对于信号变化缓和的正弦波和三角形波而言,即使在较高的频率下,它们对传热的强化作用也是非常有限的。
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| 关 键 词： | 非稳态冲击射流 传热强化 频率 波形 |
Experimental Investigation on Heat Transfer Augmentation with Unsteady Impinging Jet |
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| ZHOU Jingwei,YANG Xingxian,GENG Liping,WANG Yugang.Experimental Investigation on Heat Transfer Augmentation with Unsteady Impinging Jet[J].Chinese Journal of Mechanical Engineering,2010,46(6). |
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| Authors: | ZHOU Jingwei YANG Xingxian GENG Liping WANG Yugang |
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| Affiliation: | College of Metrology and Measurement Engineering/a>;China Jiliang University/a>;Hangzhou 310018 |
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| Abstract: | An experimental investigation is performed to study the effect of unsteady impinging jet on convective heat transfer.Periodical unsteady flows with different shapes and frequencies are generated by a mass flow rate control system.Experiments are carried out for three typical periodical flows,namely sinusoidal,triangular and rectangular flows,at frequencies from 1.25 to 40 Hz.By means of an enhancement coefficient (Nusselt number of the unsteady flow over that for the steady flow at same time-averaged flow r... |
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| Keywords: | Unsteady impinging jet Heat transfer augmentation Frequency Wave shape |
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