Experimental Investigation for a Small Helicopter in Hovering and Forward Flight Regimes

Dayhoum, Abdallah; Zakaria, Mohamed Y.; Abdelhamid, O. E.

doi:10.1061/jaeeez.aseng-4823

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…However, the limited payload capabilities and the high energy demand of current VTOL systems have been problematic. New engines, intricate swash plates, and unique rotor design combinations have helped to partially overcome such limitations but further enhancement is required [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

Enhancing VTOL Performance: Shrouded Rotor BLDC Motor Model and Validation

Dayhoum,

Etewa,

Ramirez-Serrano

et al. 2024

J. Phys.: Conf. Ser.

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One prominent area of current research interest, driven by a multitude of factors and considerations, centers around drone technology. A primary challenge currently faced in the realm of small-scale Unmanned Aerial Vehicles (UAVs) is the increasing demand for increased power coupled with the constraint of limited flight duration provided by available battery technology. These vehicles fall into two overarching categories based on the presence or absence of shrouding around their rotor(s). Shrouded rotors play a pivotal role in augmenting aerodynamic performance by enhancing thrust while mitigating blade-tip vortex losses and numerous other aspects that are not presented in open rotors. Although such characteristics contribute to an expanded effective rotor diameter and optimized airflow within the shroud. There are numerous aspects related to power, shroud and rotor characterization, etc. that need to be understood before shrouded rotors are commonly used. This paper presents the implementation of an effective mathematical model for Brushless Direct Current (BLDC) motors, specifically tailored for application in conjunction with shrouded rotors aimed at enhancing thrust and reducing power consumption. The proposed model serves to predict the performance characteristics of the utilized motor within the context of the specified shrouded rotor combination. In order to identify the effects of the induced load torque on the rotor’s dynamic response, a methodical analysis is conducted on the numerical simulation of the proposed model. The results are experimentally verified for hover flying in a case study of a scalable and highly maneuverable vertical takeoff and landing aircraft developed for operations in highly confined spaces. The adoption of this modeling technique is anticipated to significantly streamline the shrouded rotor combination design and selection process, particularly in the selection of an appropriate motor.

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Section: Introductionmentioning

confidence: 99%

Enhancing VTOL Performance: Shrouded Rotor BLDC Motor Model and Validation

Dayhoum,

Etewa,

Ramirez-Serrano

et al. 2024

J. Phys.: Conf. Ser.

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Aerodynamic Investigation of Shrouded Rotors with Dual Exit Channels

Dayhoum,

Ramirez-Serrano,

Martinuzzi

2024

AIAA SCITECH 2024 Forum

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Number of Blades’ Influence on the Performance of Rotor with Equal Solidity in Open and Shrouded Configurations: Experimental Analysis

Dayhoum,

Ramirez-Serrano,

Martinuzzi

2024

Aerospace

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This study explores the implications of the number of blades on the performance of both open and shrouded rotors. By conducting a thorough experimental analysis at a fixed solidity ratio, this research seeks to enhance our understanding of rotor dynamics and efficiency. Two-, three-, four-, and five-bladed rotors were designed and manufactured to have the same solidity ratio. This leads to smaller chord distribution values for higher blade numbers. The experimental analysis aims to quantify the effects of the number of blades and provides a comparative analysis of performance differences between the two rotor configurations (shrouded and open). For the open rotor, results indicate that increasing the number of blades has a minimal impact on overall performance. This is due to the decrease in the tip loss factor being counterbalanced by a decline in efficiency caused by the two-dimensional airfoil performance, which results from a smaller chord and a lower Reynolds number. In contrast, the shrouded rotor exhibits a noticeable performance decay with an increased blade count. Since tip loss is inherently absent in shrouded designs, the decline is primarily attributed to the two-dimensional airfoil performance. This decay occurs while maintaining a constant solidity ratio, highlighting the significant effect of blade count on shrouded rotor efficiency, thereby contributing to the optimization of rotor design in various engineering applications.

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Experimental Investigation for a Small Helicopter in Hovering and Forward Flight Regimes

Cited by 3 publications

References 12 publications

Enhancing VTOL Performance: Shrouded Rotor BLDC Motor Model and Validation

Enhancing VTOL Performance: Shrouded Rotor BLDC Motor Model and Validation

Aerodynamic Investigation of Shrouded Rotors with Dual Exit Channels

Number of Blades’ Influence on the Performance of Rotor with Equal Solidity in Open and Shrouded Configurations: Experimental Analysis

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