Numerical analysis of the porpoising motion of a blended wing body aircraft during ditching

Zheng, Yunlong; Qu, Qiulin; Liu, Peiqing; Wen, Xueliang; Zhang, Zhicheng

doi:10.1016/j.ast.2021.107131

Cited by 20 publications

(4 citation statements)

References 28 publications

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“…Additionally, factors such as the number of blades in the fan and the duct's flow diffusion can induce flow separation and secondary flow. The Realizable k-ε model is employed to capture the complex turbulence [21,22], with the transport equations for k and ε as follows:…”

Section: Solution Methodsmentioning

confidence: 99%

Numerical Simulation and Experimental Study on the Aerodynamics of Propulsive Wing for a Novel Electric Vertical Take-Off and Landing Aircraft

Wang,

Zhang,

et al. 2024

Aerospace

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The electric vertical take-off and landing (eVTOL) aircraft offers the advantages of vertical take-off and landing, environmental cleanliness, and automated control, making it a crucial component of future urban air traffic. As competition intensifies, demands for aircraft performance are escalating, including forward flight speed and payload capacity. The article presents a novel eVTOL design with propulsive wings and establishes methodologies for propulsive wing unsteady numerical simulation and wind tunnel experiments, analyzing its aerodynamic characteristics and lift enhancement mechanism. The results indicate that the cross-flow fan (CFF) provides unique airflow control capabilities, enabling the propulsive wing to achieve remarkably high lift coefficients (exceeding 7.6 in experiments) and propulsion coefficients (exceeding 7.1 in experiments) at extreme angles of attack (30°~40°) and low airspeeds. On the one hand, the CFF effectively controls boundary layer flow, delaying airflow separation at high angles of attack; on the other hand, the rotation of the CFF induces two eccentric vortices, generating vortex-induced lift and propulsion. The aerodynamic performance of the propulsive wing depends on the advance ratio and angle of attack. Typically, both lift and propulsion coefficients increase with the advance ratio, while lift and drag coefficients increase with the angle of attack. The propulsive wing shows significant advantages and prospects for eVTOL aircrafts in the low flight velocity range (0–30 m/s).

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Section: Solution Methodsmentioning

confidence: 99%

Numerical Simulation and Experimental Study on the Aerodynamics of Propulsive Wing for a Novel Electric Vertical Take-Off and Landing Aircraft

Wang,

Zhang,

et al. 2024

Aerospace

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“…Cross-ocean flights of modern civil aircrafts have become increasingly common, making ditching on water an emergency landing scenario that must be considered in aircraft design [1][2][3]. Therefore, research on the performance of water ditching is of crucial importance.…”

Section: Introductionmentioning

confidence: 99%

Research on the Water Entry of the Fuselage Cylindrical Structure Based on the Improved SPH Model

Wang,

Yang,

Yang

2023

Applied Sciences

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During aircraft landing on water, the intense impact load may lead to significant local deformation of the fuselage skin. Ensuring the aircraft’s integrity and reliability is of paramount importance. This paper investigates the fuselage skin’s dynamic response during water entry. In the simulation of complex water entry problems, the smoothed particle hydrodynamics (SPH) method can fully leverage the advantages of the particle method. However, the traditional SPH method still suffers from the drawbacks of tensile instability, significantly affecting the computational accuracy. Therefore, this paper first introduces the improved SPH model addressing fluid and solid tensile instability issues. Furthermore, the Riemann-based contact algorithm at the fluid–solid interface is also demonstrated. Based on the above improved SPH model, the simulation of water entry of the elastic cylinder is performed to validate the efficacy of the improved SPH model. Then, the dynamic response characteristics of elastic fuselage skin and the skin–stringer–floor–column structure when it enters the water are analyzed, including the deformation features and slamming force. Lastly, based on the presented damage model, a study is conducted on the water entry of the metallic elastic–plastic skin–stringer–floor–column structure, analyzing the locations of failure and providing guidance for the structural safety design of engineering.

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“…Several aspects of ditching were assessed by Woodgate et al, [7] and Guo et al, [8]. The numerical research about proposing motion during ditching in blended wing body (BWB) aircraft was introduced by Zheng et al, [9] and Xiao et al, [10]. The proposed seaplane float has been originally inspired from Syamsuar et al, [11], who studied the numerical simulation using Computational Fluid Dynamics (CFD) method to determine the hydroplaning resistance.…”

Section: Introductionmentioning

confidence: 99%

A Proposed Seaplane Float in Water Entry Problem and Landing in Waves using Particle Based Method

Dimas Bahtera Eskayudha

2023

ARNHT

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Seaplane is the newly transportation mode which is developed in the Indonesian Archipelago Region. Originally, the seaplane is equipped by pair of the floats in function to withstand the aircraft load and maintain the seaplane on the water stably. One of the critical moments in the seaplane operation is in the landing phase in waves. The failure in the float performance can be led into severe conditions, even the capsize. In this paper, the aims are to determine the water impact characteristics and response of the proposed seaplane float by implementing the water entry case, calm water landing, and when landing in the periodic waves condition. The numerical model was developed using DualSPHysics based on Smoothed Particle Hydrodynamic to obtain more realistic and accurate prediction of the pressure, velocity fields, and water spray motion with droplets in complex shape of the float. According to numerical results and reproducible experimental data in this study, the 2D water entry and 3D calm and waves water problem were applied to reproduce the detailed characteristics of the interaction between the proposed seaplane float and the water surface with splashing. The paper showed that the developed model could be a useful tool to design the seaplane float for Indonesian seaplane in the future

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Numerical analysis of the porpoising motion of a blended wing body aircraft during ditching

Cited by 20 publications

References 28 publications

Numerical Simulation and Experimental Study on the Aerodynamics of Propulsive Wing for a Novel Electric Vertical Take-Off and Landing Aircraft

Numerical Simulation and Experimental Study on the Aerodynamics of Propulsive Wing for a Novel Electric Vertical Take-Off and Landing Aircraft

Research on the Water Entry of the Fuselage Cylindrical Structure Based on the Improved SPH Model

A Proposed Seaplane Float in Water Entry Problem and Landing in Waves using Particle Based Method

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