| Citation: | WANG Junjie, CHEN Renliang, YU Zhiming, et al. Numerical simulation of ground effect and water surface effect of quad tilt rotor aircraft[J]. Journal of Aerospace Power, 2024, 39（12）：20220892 doi: 10.13224/j.cnki.jasp.20220892
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A combined grid around the rotor, wing and fuselage was generated based on the sliding grid technology. The volume of fluid (VOF) model was used to identify the multiphase flow. An unsteady numerical simulation method suitable for the amphibious quad tilt rotor (QTR) aircraft was established and verified by design tests. The aerodynamic performance of the QTR aircraft under the ground and water surface effect was studied and compared with that without the ground effect. The results showed that, due to the blockage of the ground and water surface, there existed a high-pressure zone under the rotor, which may increase the lift of the rotor, reducing the negative lift of the wing, and increasing the lift of the fuselage of the QTR. However, when the height above the ground/water surface was greater than rotor diameter, no ground effect can be considered; the water surface was impacted by the downwash flow from the rotor, forming a flexible “drainage area”, which increased the distance between the rotor and the blocking surface, so that at the same distance from the ground, the increased lift under the water surface effect was lower than that under the ground effect but stronger than that without ground effect; the water surface effect flow field was more complex, the airflow along the concave surface of the drainage area formed a vortex circulation around the rotor.
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