A model-based design approach for low-pressure axial fan blades considering the air flow system characteristics

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-09-13 DOI:10.1016/j.ijrefrig.2024.09.003

Gabriel L. Podgaietsky , Adriano F. Ronzoni , Christian J.L. Hermes

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Abstract

The paper puts forward a computer methodology for designing low-pressure axial fan blades for small-capacity refrigeration applications. Based on the blade element theory (BET), the airfoil efficiency of the airfoil, the principles of mass and momentum conservation together with empirical correlations for the flow irreversibilities, a mathematical model was devised for screening the blade geometric parameters (e.g., radial chord and pitch variation, and hub radius) by varying the induction coefficient distribution for a given fan diameter, motor speed, and airflow system characteristic curve. The best blade configuration is selected by means of a tailor-made optimization algorithm and undergoes a series of linear transformations for translating the fan parametrization into a CAD drawing. Two new fan blades were designed, one for maximum blade efficiency (MBE) and another for maximum airflow rate (MAR). In comparison with the free-swirl design approach, a standard procedure adopted in the open literature, the proposed blades showed an efficiency and an airflow by 20 % (MBE) and 14 % (MAR) higher than the reference. The airflow characteristics of the new designs were also assessed by means of wind-tunnel testing, which confirmed an increase of 11 % in the case of MBE design, while an enhancement of 10 % was observed in the case of MAR design.

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考虑气流系统特性的低压轴流风扇叶片模型设计方法

本文提出了一种用于设计小容量制冷应用的低压轴流风扇叶片的计算机方法。根据叶片元素理论（BET）、机翼效率、质量和动量守恒原理以及流动不可逆性的经验相关性，设计了一个数学模型，在给定风扇直径、电机转速和气流系统特性曲线的条件下，通过改变感应系数分布来筛选叶片几何参数（如径向弦和节距变化以及轮毂半径）。通过量身定制的优化算法选择最佳叶片配置，并进行一系列线性变换，将风扇参数化转化为 CAD 图纸。设计了两种新的风扇叶片，一种用于最大叶片效率 (MBE)，另一种用于最大气流率 (MAR)。与公开文献中采用的标准程序--自由旋流设计方法相比，所提出的叶片在效率和气流方面分别比参考值高出 20%（MBE）和 14%（MAR）。风洞试验也对新设计的气流特性进行了评估，证实 MBE 设计的气流特性提高了 11%，而 MAR 设计的气流特性提高了 10%。

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

International Journal of Refrigeration-revue Internationale Du Froid 工程技术-工程：机械

CiteScore

7.30

自引率

12.80%

发文量

363

审稿时长

3.7 months

期刊介绍： The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.