Aeroacoustic impact of heat exchanger installation in an industrial engine cooling module

IF 4.3 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2026-03-01 Epub Date: 2025-12-07 DOI:10.1016/j.apacoust.2025.111175

Francesco Bellelli , Renzo Arina , Stéphane Moreau , Francesco Avallone

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引用次数: 0

Abstract

Engine cooling fan noise becomes even more difficult to predict when considering the presence of the heat exchanger upstream. This paper investigates the impact of different heat exchanger installations on the noise sources of an industrial engine cooling fan using high-fidelity lattice-Boltzmann simulations. The heat exchanger is simulated using an equivalent porous medium upstream of the fan. Four configurations are analyzed at free discharge: full cooling module (i) without and (ii) with a gap between the heat exchanger and its casing, (iii) Fan+Frame, and (iv) Fan. For the sake of comparison, configurations (iii) and (iv) are simulated by imposing a pressure difference that matches the one across the heat exchanger, to ensure that the same operating point is maintained. Results show negligible differences in the overall aerodynamic performance since the same average pressure rise is achieved. The presence of the porous medium affects the spatial distribution of the pressure field upstream of the fan, thus causing a higher tonal content compared to the configurations (iii) and (iv). Further subharmonic humps are caused by the interaction of the blades with vortex structures generated by flow separation at the tip and the casing’s support structures. The presence of a geometry transition from square to round in the casing causes inflow distortions, increasing low-frequency broadband noise.

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工业发动机冷却模块中热交换器安装的气动声学影响

当考虑到上游热交换器的存在时，发动机冷却风扇的噪音变得更加难以预测。本文采用高保真栅格-玻尔兹曼模拟研究了不同换热器安装方式对工业发动机冷却风扇噪声源的影响。热交换器采用风扇上游的等效多孔介质进行模拟。在自由排放的情况下，分析了四种配置：全冷却模块(i)无热交换器与外壳之间的间隙和（ii）有热交换器与外壳之间的间隙，（iii）风扇+框架，（iv）风扇。为了进行比较，通过施加与热交换器上的压差相匹配的压差来模拟配置（iii）和（iv），以确保保持相同的工作点。结果表明，由于实现了相同的平均压力上升，整体气动性能的差异可以忽略不计。多孔介质的存在影响了风机上游压力场的空间分布，从而导致比配置（iii）和（iv）更高的音调含量。进一步的次谐波峰是由叶片与叶尖处流动分离和机匣支撑结构产生的涡结构相互作用引起的。套管中从方形到圆形的几何转变会导致流入扭曲，增加低频宽带噪声。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

期刊介绍： Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems. Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.