The effect of the outlet air duct design of a centrifugal compressor on the gas-dynamic and heat-exchange characteristics of the air flow

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow Pub Date : 2025-09-24 DOI:10.1016/j.ijheatfluidflow.2025.110082

Leonid Plotnikov

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引用次数: 0

Abstract

The specific, technical, and economic indicators of an engine can be significantly increased by using a turbocharger. The relevance of this study is that enhancing the design and physical processes in the elements of a centrifugal compressor can result in improved efficiency and productivity of the turbocharger and engine. The study’s objective was to create design strategies for upgrading the compressor outlet air duct to regulate the gas-dynamic and heat-exchange characteristics of the flow. The compressor outlet air duct of an automobile turbocharger served as the research object, and both the compressor and turbine wheels had a diameter of 61 mm. The scientific novelty of the article consists in the study of physical processes in the turbocharger outlet air duct (other authors’ studies were aimed at the inlet channels) and the development of original designs of outlet air ducts. Two approaches were employed: one to stabilize the flow by using a honeycomb in the air duct and another to increase flow turbulence by applying dimples on the channel surface. The study covered the range of rotor speeds from 20,000 to 60,000 min⁻¹ (1.9·10⁵ < Re < 3.3·10⁵). New experimental data on gas dynamics and heat transfer of flows for different air duct designs were obtained through tests on a laboratory bench and measuring equipment based on constant-temperature anemometers, a pressure sensor, thermocouples, tachometers, and an analog-to-digital converter. It has been shown that the use of a honeycomb in the air duct leads to a drop in air flow of up to 14 %, a decrease in turbulence number of up to 36 %, and an increase in the heat transfer coefficient of up to 21 % compared with the basic design. It was found that the application of dimples in the air duct causes a decrease in air flow of up to 8 %, an increase in the number of turbulences of up to 17 %, and an intensification of heat transfer of up to 25 %. Additionally, a simple examination was done to evaluate the impact of modernized air outlet ducts on the engine’s efficiency and power.

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离心式压缩机出口风道设计对气流动力学和换热特性的影响

使用涡轮增压器可以显著提高发动机的具体技术和经济指标。这项研究的相关性在于，加强离心压缩机元件的设计和物理过程可以提高涡轮增压器和发动机的效率和生产率。该研究的目的是创建设计策略，以升级压缩机出口风道，以调节气流的气体动力学和热交换特性。以某汽车涡轮增压器压气机出口风道为研究对象，压气机和涡轮直径均为61 mm。本文的科学新颖之处在于对涡轮增压器出口风道的物理过程的研究（其他作者的研究是针对进口通道的）和对出口风道的原始设计的发展。采用了两种方法：一种是通过在风道中使用蜂窝来稳定流动，另一种是通过在沟道表面施加凹痕来增加流动湍流。该研究涵盖了从20,000到60,000 min - 1（1.9·105 < Re < 3.3·105）的转子转速范围。通过实验台和基于恒温风速计、压力传感器、热电偶、转速计和模数转换器的测量设备的测试，获得了不同风道设计的气体动力学和流动传热的新实验数据。研究表明，与基本设计相比，在风道中使用蜂窝结构可使风量下降14%，湍流数减少36%，传热系数提高21%。结果表明，在风道中应用凹痕可使气流减少8%，湍流次数增加17%，传热强度增加25%。此外，还进行了一项简单的测试，以评估现代化出风口对发动机效率和功率的影响。

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来源期刊

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.