Effect of Inlet Flow Velocity on Heat Transfer&nbsp;Performance
of TwoStaged Intercooler

Vehicle Engine ›› 2026, Vol. 0 ›› Issue (4) : 12-21.

Effect of Inlet Flow Velocity on Heat Transfer Performance of TwoStaged Intercooler

YE Pengyang¹,YIN Yuting²,LIU Zhentao¹

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Abstract

In order to systematically study the impact of inlet flow velocity parameters on the heat transfer performance of intercooler, a three-dimensional numerical model of a two-staged intercooler based on a representative unit was established using computational fluid dynamics (CFD) method. Using the k-ω SST turbulence model, grid independence verification and the comparison between simulation results and experimental data were carried out, and it was confirmed that the model accuracy was able to meet engineering requirements. By analyzing the temperature distribution, heat dissipation, and air-side pressure drop of the first and second stage intercoolers under different water-side inlet flow velocities, the following conclusions were drawn.The optimal water flow rate for the first stage was 10 m³/h, and it should be greater than 2.5 m³/h to prevent coolant vaporization.The optimal water flow rate for the second stage is 20 m³/h; increasing the water-side flow rate could significantly improve temperature distribution uniformity. In addition, it was found that the air-side inlet flow velocity exhibited obvious uneven distribution, and hence it was recommended to control the air-side flow velocity within 1.75 m/s to optimize flow uniformity.

Key words

intercooler / numerical simulation / flow velocity / velocity field / uniformity

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YE Pengyang, YIN Yuting, LIU Zhentao. Effect of Inlet Flow Velocity on Heat Transfer Performance of TwoStaged Intercooler[J]. Vehicle Engine. 2026, 0(4): 12-21