Dört Rotorlu İHA Pervanesinde Uçuş Hızı ve Dönme Hızının İtme Katsayısı Üzerine Etkilerinin Sayısal Araştırılması

Oktay, Tugrul; Eraslan, Yüksel

doi:10.30518/jav.872627

Cited by 9 publications

(3 citation statements)

References 10 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In multirotor UAVs, the mechanism of lift generation is intertwined with the propulsion systems, namely the electrical motors and propellers. This renders their accurate numerical modeling of utmost importance, to optimize the UAV's flight performance and control characteristics [3]. Currently, a great selection of different propellers and motors is available, and though it provides several alternatives for the designer, it also makes the final design selection more difficult.…”

Section: Introductionmentioning

confidence: 99%

CFD aided investigation of a three-blade propeller in multirotor UAV applications

Vlachos,

Pliakos,

Bliamis

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

In the recent years a rapid increase of multirotor UAVs in the commercial market is observed resulting in a large number of motor/propeller concepts and thrust architectures. The limited availability of data for the aerodynamic performance of the motor/propeller system often leads to a non-optimal operation on multirotor UAVs design points. Since experimental investigations are both cost- and time-demanding, the accurate CFD modeling of UAV propellers is crucial and highly supportive in the early design phases of multirotor UAVs. In the current study, a CFD framework is employed for the performance investigation of a small-scale three-blade propeller on a lightweight micro quadrotor UAV, designed for indoor search and rescue operations. More specifically, two widely implemented methods for propeller modeling are examined, namely the Multiple Reference Frame (MRF) and the Sliding Mesh (SM). Several operating points are investigated, corresponding to different propeller rotating speeds (RPM) and Reynolds numbers. The accuracy of each method is evaluated by comparing the CFD results with those obtained from literature experimental data. Finally, the uncertainty of the computational methods is quantified through Richardson’s extrapolation method.

show abstract

Section: Introductionmentioning

confidence: 99%

CFD aided investigation of a three-blade propeller in multirotor UAV applications

Vlachos,

Pliakos,

Bliamis

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Remarkably, geometry specifications vary for every different aircraft (Marco et al, 2020). Typically, the geometry is optimized by use of computational fluid dynamics (CFD) (Mosquera et al, 2018) which uses the Navier-Stokes equations as a basis (Duan et al, 2008;Oktay and Eraslan, 2020;Öz, 2021, 2022 and uses Fourier transform techniques (Jonsson et al, 2019). Furthermore, the engine selection directly affects many performance parameters such as speed, altitude and range (Dugan, 1973;Abdalla et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Conceptual design modeling by the novel aircraft conceptual design and analysis system (ACDAS)

Ünal

Öz²,

Oktay

2023

AEAT

View full text Add to dashboard Cite

Purpose Throughout an aircraft development process, the conceptual design phase is an extremely important milestone; hence, the quality and success of this step directly affect the overall cost and lead time of the project. Because of this fact, the purpose of this study is to provide outputs and suggestions to the designing engineer regarding the requirements for reducing overall design time as well as costs and creating an ideal design at the early phases of the project by optimizing the aircraft development process. Design methodology approach The system has been prepared parametrically and presents some performance specifications for the aircraft in the early phases of the design, for example, coefficients for lift CL as well as drag CD and weight as well as fuel estimations. The software uses a combination of well-known design techniques within just one platform in contrast to many other applications. Because of this feature, it is not needed to use different sub-platforms which would require an appropriate environment and even though would lead to complications with regard to the connectivity. The system also presents relevant information about the aircraft performance like velocity versus load factor (V-n) diagrams, maximum turn rate of climb, turn rate and climb angle graphs in contrast to many other open-source conceptual design platforms. Findings In this study, authentic General Dynamics F-16 Fighting Falcon and McDonnell Douglas F-15 Eagle data were used as input to the system, and advanced geometric and/or performance graphs were obtained and compared to the literature where a good agreement of the results was observed. These results with regard to the aircraft performance are typically product specific and quite rare in the literature. These data obtained by use of the software during the aircraft design are, thus, of major interest, especially for the design of new aerospace platforms. In this study, all of these graphs (especially the remarkable V-n diagram) are obtained on one platform. Originality value The aircraft conceptual design and analysis system software provides information and suggestions regarding the requirements for reducing the overall design time, reducing the design costs and creating an optimized design at the early phases of a project by optimizing the aircraft development process within just one convenient, that is, user friendly, platform, where it uses a combination of varying methodologies. Besides presenting one interface, which is quite typical for conceptual design tools, it allows applications of methods like vortex lattices and finite differences for obtaining aerodynamic performance parameters.

show abstract

“…The key issue is also the balance between computational cost and accuracy especially for transient cases which covers a long simulation time with small time step intervals. 29–31 For saving the computational cost, structural grid is a good choice. 32 However, there are many parameters should be properly valued.…”

Section: Introductionmentioning

confidence: 99%

Calibration of CFD grid for simulating the impeller clearance flow and axial hydraulic force of centrifugal pump

Jin

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The axial hydraulic force of centrifugal pump is an important parameter affecting pump performance. The force mainly includes the force inside impeller and in clearance. Due to the special structural characteristics of the clearance, the influence of grid discretization method on the calculation of axial force in the clearance is not fully understood. Therefore, based on the Reynolds-averaged method with shear stress transport turbulence model, an orthogonal experiment was designed to compare the correlation coefficient of velocity and pressure distribution between shear stress transport model and large eddy simulation models. A more suitable grid discretization strategy was found by artificial neural network for grid calibration. When the strategy is applied to the entire centrifugal pump, the prediction of axial force has high accuracy. The range analysis shows that the grid node number in the wall-wall direction has the greatest impact on velocity distribution. When the mesh parameters are in a certain range, it can compromise between the simulation accuracy and computational resource. The Reynolds-averaged model based simulation is proved accurate in capturing the complex velocity and pressure field inside clearance. The entire pump model is also used for the verification after the calibration of grid. The typical axial force law can be found under different flow rate conditions. This study provides a significant guidance in determining the grid scheme for accurate prediction of centrifugal pump’s axial force. It makes the computational fluid dynamics simulation feasible in the initial design of centrifugal pump which specifically considers the axial force problem.

show abstract

Dört Rotorlu İHA Pervanesinde Uçuş Hızı ve Dönme Hızının İtme Katsayısı Üzerine Etkilerinin Sayısal Araştırılması

Cited by 9 publications

References 10 publications

CFD aided investigation of a three-blade propeller in multirotor UAV applications

CFD aided investigation of a three-blade propeller in multirotor UAV applications

Conceptual design modeling by the novel aircraft conceptual design and analysis system (ACDAS)

Calibration of CFD grid for simulating the impeller clearance flow and axial hydraulic force of centrifugal pump

Contact Info

Product

Resources

About