The numerical simulation of boundary layer ingestion fan based on body force


	model

Abstract

Abstract:

There is a complex distorted flow field at the inlet of boundary layer ingestion (BLI) fan, but most of the existing

research are limited to traditional three-dimensional simulation methods, which are time-consuming. This article

takes the DGEN380 fan rotor as the research object and designs an S-shaped inlet that matches it to ingest incoming boundary layer, and a calculation method based on the body force model (BFM) is adopted. The trend of

parameter changes in the calculation results is well consistent with the unsteady calculation results. The circumferential average values of the swirl angle and dimensionless total pressure at the fan inlet deviate from the unsteady

results within 6%, and the calculation time is 1/50 of that of the unsteady method. Based on this model, the influence of three different thicknesses of BLI at inlet heights of 15%, 30%, and 60% on the flow field at the inlet and

outlet of the fan rotor is explored. The results show that, for the fan rotor inlet, the degree of total pressure distortion and swirl distortion increases with the BLI thickness increasing at different blade heights, and the swirl distribution presents a paired vortex form. After passing through the fan rotor passage blades, the paired vortexes

gradually transform into a unidirectional vortex, and the backward angle of the airflow at the fan rotor outlet decreases. The power coefficient value of BLI fan has been improved compared to the uniform flow condition.

Key words:

boundary layer ingestion, body force model, S-shaped inlet, swirl distortion, total pressure distortion

CLC Number:

V231.3

YANG Xiaojuna , YU Siyingb , KONG Qingguob.

The numerical simulation of boundary layer ingestion fan based on body force

model

[J]. Journal of Civil Aviation University of China, 2025, 43(5): 73-81.

References 20

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The numerical simulation of boundary layer ingestion fan based on body force

model

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