| 陈勇刚1，3 ，张天来 1，3 ，赵梁1 ，刘翔1，3 ，李世林 2.U形管内含水航空燃油流动及换热特性数值模拟[J].航空发动机,2023,49(4):1-8 |
| U形管内含水航空燃油流动及换热特性数值模拟 |
| Simulation on Flow and Heat Transfer Characteristics of Aviation Fuel with Water in U-tube |
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| DOI： |
| 中文关键词: U形管 压降 传热 含水率 环境温度 航空发动机 |
| 英文关键词:U-tube pressure drop heat transfer water content ambient temperature aeroengine |
| 基金项目:民航局安全能力项目（14002600100017J003）、中国民用航空飞行学院科研基金面上项目（J2020-108，
J2021-106）资助 |
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| 中文摘要: |
| 为探究航空发动机燃油管路内流动及换热特性，建立发动机外部U形燃油管路含水燃油离散相模型（DPM）进行数值模
拟。结果表明：体积含水率（≤10%）越高，U形管全管段的压降梯度越大，换热系数越高；流动分离、迪恩涡、离心力作用和油水两
相相互作用导致流动阻力增大，是弯管段压降梯度明显大于一般直管的主要原因。不同流量条件下：迪恩涡引起的燃油横向输运
和二次流流速分布对弯管段的周向换热不均现象影响较大，弯管内、外侧的换热系数大小关系可以根据弯管段迪恩数判定。环境
温度不变，流量越大，U形管全管段压降越高，沿程换热系数越大，且含水率越高，流量对压降梯度的影响越明显；流量不变，环境
温度越低，U形管全管段压降越高，沿程换热系数越小。 |
| 英文摘要: |
| A Discrete Phase Model（DPM）for aviation fuel with water in external U-tube of aeroengine was established to study its
flow and heat transfer characteristics by numerical simulations. The results show that the larger the volumetric water content（≤10%）, the
larger the pressure-drop gradient and the higher the heat transfer coefficient of the total U-tube. The flow separation, Dean vortices, action
of centrifugal force and oil-water two-phase interaction lead to an increase of flow resistance, which are the main reasons why the pressure-
drop gradient of the bend significantly larger than that of the general straight tube. It can be found that the lateral transportation of the fuel
and velocity distribution of secondary flow, resulting from the Dean vortex, greatly influence the uneven circumferential heat transfer phe-
nomenon in the bend under different flow conditions. The relationship of the heat transfer coefficients between the internal and external
sides of the bend can be estimated by its Dean number. Under a constant ambient temperature, the larger the flow quantity, the larger the
entire tube pressure drop, and the higher the heat transfer coefficient along the tube, and the trend is more significant with an increase in
volumetric water content. Under a constant flow rate, the lower the ambient temperature, the larger the entire tube pressure drop, and the
lower the heat transfer coefficient along the tube. |
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