振动环境下喷雾冷却的临界热流密度模型

王泽; 邢玉明; 刘鑫; 赵亮; 季益斌

doi:10.13224/j.cnki.jasp.2018.03.011

振动环境下喷雾冷却的临界热流密度模型

doi: 10.13224/j.cnki.jasp.2018.03.011

1.
北京航空航天大学航空科学与工程学院,北京 100191
2.
中国航空工业集团有限公司南京机电液压工程研究中心航空机电系统综合航空科技重点实验室,南京 211106

基金项目: 航空科学基金（20132851034）

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出版历程
- 收稿日期: 2016-08-08
- 刊出日期: 2018-03-28

Model of critical heat flux for spray cooling under vibration environment

摘要

摘要: 针对振动环境对喷雾冷却临界热流密度(CHF)的影响问题,基于静止环境喷雾冷却CHF模型,定义并引入内切偏离因子,建立振动环境下喷雾冷却CHF点基模型,对比3种不同工作模式的影响。结果表明:工作模式1周期平均CHF相对其他两种模式分别提高0.98%和1.17%。该模式下,周期内CHF的变化呈现双峰结构,且后半周期最低热流密度高于前半周期最低热流密度,周期内最小CHF较最大CHF下降3.02%。振动幅度越大,CHF下降越大,1.0mm振幅相对0.2mm振幅条件下的周期平均CHF下降1.74%。分析喷雾锥角的影响,55.8°、90°全位角喷雾锥角相对30°喷雾锥角,平均CHF分别下降4.83%及16.21%。大锥角下,后半周期的峰谷值相较周期内最大CHF下降减小。喷雾锥角小的喷嘴能够减小表面振动对喷雾冷却临界热流密度的恶化。
- 喷雾冷却 /
- 临界热流密度(CHF) /
- 振动环境 /
- 点基模型 /
- 正弦振动
Abstract: The effect of vibration environment on critical heat flux (CHF) of spray cooling was studied. The point-based CHF model under vibration environment was built by defining factor which represented the degree of deviating from the inscription state, based on the CHF model in normal environment. Three operation modes were compared, and the operation mode one had 0.98% and 1.17% increase in the period-average CHF compared with the others. In the operation mode one, the curve of CHF showed a bimodal structure, and the minimum CHF of the second half of period was larger than that of the first half of period. The minimum CHF was 3.02% lower than the maximum CHF. The larger vibration amplitude led to the greater decrease of the CHF. The average CHF with 1.0mm amplitude was 1.74% lower than that with 0.2mm amplitude. The influence of spray angle was discussed. The average CHF showed 4.83% and 16.21% drop in 55.8° and 90° cases respectively, compared with 30° spray angle case. The difference between the minimum CHF of the second half of period and maximum CHF was smaller in larger spray angle case. Using nozzle with small spray angle could reduce the negative effect of vibration.
- spray cooling /
- critical heat flux(CHF) /
- vibration environment /
- point-based model /
- sinusoidal vibration

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