Blended Wing Body Thrust Reverser Cascade Feasibility Evaluation Through CFD

Yu, Gang; Li, Dong; Chen, Zhenli; Zhang, Zeyu

doi:10.1109/access.2019.2949062

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…We also performed a numerical analysis on the performance of the Bernoulli exhaust system for the 3D model of the disaster prevention comprehensive test site. As the first step in the numerical analysis process, we arranged a solid element for the 3D design [29]. After drawing the overall shape of the tunnel, we extracted the volume of the space where the flow occurred and designed the mesh [30].…”

Section: Computational Fluid Dynamics (Cfd) Numerical Analysis Methodsmentioning

confidence: 99%

Application of the Bernoulli Effect for Improving Smoke Exhaust Efficiency in Tunnel Fires

Hong,

Yun,

Cho

2023

IEEE Access

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In South Korea, where mountainous terrain accounts for a significant proportion of the country, tunnels are essential for reaching destinations via the shortest possible route. Tunnels are high-traffic areas with only two exits, making them vulnerable to large-scale disasters in the event of a fire. However, existing longitudinal-flow-type exhaust systems (jet fans) are insufficient for effective smoke exhaust during a tunnel fire. Herein, a new ventilation system is proposed that uses a device with nozzles for expelling high-speed winds to generate a more robust ventilation flow at a tunnel entrance. A computational fluid dynamics (CFD) analysis showed that a jet fan system had a wind speed of 1.52 m/s at the tunnel exit. This system removed a total of 37,053.9 kg of air in 600 s. By contrast, the proposed Bernoulli ventilation system had a wind speed of 1.85 m/s at the tunnel exit and removed 53,308.4 kg air in 600 s. The simulation results from a scaleddown model of the tunnel safety testing facility were compared with the CFD analysis results. The ratio of the wind speeds between the tunnel entrance and exit was 2.7:1, exhibiting a similar trend. In conclusion, this study experimentally verified a CFD analysis of a Bernoulli ventilation system and provided a direction for improving longitudinal-flow-type exhaust systems. The results can be a foundational resource for government agencies (such as the Road Traffic Authority) in improving current ventilation systems.

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Section: Computational Fluid Dynamics (Cfd) Numerical Analysis Methodsmentioning

confidence: 99%

Application of the Bernoulli Effect for Improving Smoke Exhaust Efficiency in Tunnel Fires

Hong,

Yun,

Cho

2023

IEEE Access

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“…The finite volume method was applied to solve the RANS equation, the second-order upwind Roe-FDS scheme was applied to discretize the inviscid spatial term, and the second-order central difference scheme was applied to discretize the viscid spatial term. The turbulence model used was the k-omega SST model (Menter, 1994) and the time-stepping method was the approximate factorization (AF) implicit time-marching method (Gang, Dong, Zhenli, & Zeyu, 2019). To accelerate convergence, the multi-grid method was applied.…”

Section: Methodsmentioning

confidence: 99%

Numerical simulation for the differences between FTN/WPN engine models aerodynamic influence on BWB300 airframe

Zhang

2020

Engineering Applications of Computational Fluid Mechanics

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The difference of the aerodynamic influence of two engine models -the Flow Through Nacelle (FTN) and With Powered Nacelle (WPN) -on BWB300 airframe is analyzed by using the 3-D unsteady compressible Reynolds-Averaged Navier-Stokes (RANS) computation. The results indicate that at cruise condition, the engine shape is a primary factor affecting the BWB airframe upper fuselage surface flow, the two engine models exhibit a similar aerodynamic influence on the BWB airframe. However, at takeoff condition, the two engine models' aerodynamic influence on the airframe is different, because of the air suction caused by the WPN engine model affecting the airframe upper fuselage surface flow obviously. Moreover, at both cruise and takeoff conditions, the tube formed by the engine and airframe shape changes the surface flow under the engine and the air suction caused by the engine power accelerates the surface flow near the engine. ARTICLE HISTORY

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“…The turbulence model used is k-omega SST model. The time-stepping method is an approximate factorization (AF) implicit time-marching method; the multigrid method is applied to accelerate the convergence process of calculation [25].…”

Section: The Aerodynamic Performance Of Swbmentioning

confidence: 99%

Design Improvement of a BWB Aerodynamic Performance at Cruise and Take-Off Speeds

Duan

2022

International Journal of Aerospace Engineering

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As a high-performance aircraft, BWB (blended wing body) has attracted the attention of many countries around the world. A 300-seat BWB design is proposed by the Airplane Concept Design Institute of Northwestern Polytechnical University, which is also called SWB. The aerodynamic performance of it is evaluated by CFD (computational fluid dynamics). The CFD calculation method is based on RANS (Reynolds-averaged Navier–Stokes), and it is verified by wind tunnel test results at take-off speed. However, the aerodynamic design of the SWB needs to be improved to meet the market demand to increase its cruise Mach number from 0.8 to 0.85. To achieve this goal, firstly, based on the previous calculation and analysis results, the basic shape of SWB is improved by using “aft-body extending” technology and discrete adjoint optimization method. Then, the winglets are applied to the improved basic shape to improve its cruise speed aerodynamic performance, and the Krueger flaps are applied as its high-lift device to improve its take-off and landing aerodynamic performance. The CFD calculation and wind tunnel test results show that these improvements make SWB-2 have a good aerodynamic performance at the Mach number of 0.85. Therefore, these design improvements are appropriate and effective for improving the aerodynamic performance of BWB.

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Blended Wing Body Thrust Reverser Cascade Feasibility Evaluation Through CFD

Cited by 4 publications

References 26 publications

Application of the Bernoulli Effect for Improving Smoke Exhaust Efficiency in Tunnel Fires

Application of the Bernoulli Effect for Improving Smoke Exhaust Efficiency in Tunnel Fires

Numerical simulation for the differences between FTN/WPN engine models aerodynamic influence on BWB300 airframe

Design Improvement of a BWB Aerodynamic Performance at Cruise and Take-Off Speeds

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