Aerodynamics of a short intake in crosswind
Aerodynamics of a short intake in crosswind
复制标题
侧风中短进气的空气动力学
DOI：
10.1016/j.ast.2022.107826
复制
发表时间：
2022
影响因子：
5.6
通讯作者：
Boscagli L
中科院分区：
文献类型：
--
作者：
Boscagli L
下一代涡轮风扇航空发动机很可能会增加风扇直径，以降低比推力并提高整体推进效率。可以使用具有可能更短的进气口的更紧凑的发动机舱来减少重量和阻力，并实现燃料消耗的净减少。对于这些紧凑型短舱，一个关键的考虑因素是在非设计条件下（如逆风和大迎角运行）短进气道的设计。在这些非设计条件下，短进气道和风扇之间的紧密耦合相互作用是关键挑战之一。以前的工作集中在短进气空气动力学对风扇的影响，但也有类似的要求，以了解可行的短进气设计空间风扇的影响。本文研究了在有风条件下，风扇对短进气道内流动分离起始的影响。从定常和非定常两个角度考虑了风扇对进气边界层分离特性的影响。风扇计算模型的层次结构被用来分别评估不同的空气动力学贡献，并评估风扇对进气临界条件的净影响。稳态计算流体动力学分析表明，相对于没有风扇的配置，风扇对分离后条件下的总压损失有显著的积极影响。然而，非定常分析表明，风扇不稳定性对进气分离特性有不利影响，使进气临界条件降低约15%。确定了非定常相互作用的主要机制。总的来说，这项工作的地址，第一次，风扇不稳定的边界层分离特性的作用在短进气道内的风。
The next generation of turbofan aero-engines are likely to have an increase in fan diameter to reduce the specific thrust and increase the overall propulsive efficiency. More compact nacelles with possibly shorter intakes may be used to reduce weight and drag and achieve a net reduction of fuel consumption. For these compact nacelles a key consideration is the design of the short intake at the off-design conditions such as crosswind and high incidence operations. The close coupled interaction between a short intake and the fan at these off-design conditions is one of the key challenges. Previous work focused on the impact of short intake aerodynamics on the fan but there is a similar requirement to understand the impact of the fan on the viable short intake design space. This paper addresses the influence of the fan on the separation onset of the flow within a short intake under crosswind conditions. The effect of the fan on the separation characteristics of the intake boundary layer was considered both from a steady and an unsteady point of view. A hierarchy of fan computational models was used to separately assess the different aerodynamic contributions and to evaluate a net effect of the fan on the intake critical condition. Steady computational fluid dynamics analyses showed a notable positive effect of the fan on total pressure loss at post-separation conditions relative to a configuration without the fan. However, unsteady analyses revealed that fan unsteadiness has an adverse impact on the intake separation characteristics which reduces the intake critical conditions by about 15%. The main mechanisms behind the unsteady interaction were identified. Overall this work addresses, for the first time, the role of fan unsteadiness on the separation characteristics of the boundary layer within a short intake in crosswind.
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DOI：
--
发表时间：
2019
期刊：
Direct and Large-Eddy Simulation XI
影响因子：
--
作者：
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影响因子：
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DOI：
10.1115/gt2020-16296
发表时间：
2020
期刊：
Journal of Turbomachinery
影响因子：
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DOI：
--
发表时间：
2016
期刊：
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作者：
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DOI：
--
发表时间：
2014
期刊：
影响因子：
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