摘要 :
In this work, wind tunnel testing is conducted on three different centimetre-scale micro wind turbine (CSMWTs) sets with different diameter scales and blade geometry. Each set consists of two micro turbines of the same blade numbe...
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In this work, wind tunnel testing is conducted on three different centimetre-scale micro wind turbine (CSMWTs) sets with different diameter scales and blade geometry. Each set consists of two micro turbines of the same blade number and shape but with different diameter. The aim is to obtain a direct relation between the rpm, rotor diameter and output power at different rated speeds. These opposing factors should be optimized when designing such (CSMWTs) with a maximum power-output. In doing so, one can determine the dependency of the harvested power on the rotor diameter along with the electric load resistance. Based on the experimental results conjuncted with a simple output power equation proposed can results in a suitable correction in modelling such micro wind turbines (MWTs). Measurements are performed over two values of air speeds as maximum and minimum boundary and a board range of electric resistive loads. The results shows an optimal combination between the rotor diameter and the rotational speed of the turbines.
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摘要 :
In this work, wind tunnel testing is conducted on three different centimetre-scale micro wind turbine (CSMWTs) sets with different diameter scales and blade geometry. Each set consists of two micro turbines of the same blade numbe...
展开
In this work, wind tunnel testing is conducted on three different centimetre-scale micro wind turbine (CSMWTs) sets with different diameter scales and blade geometry. Each set consists of two micro turbines of the same blade number and shape but with different diameter. The aim is to obtain a direct relation between the rpm, rotor diameter and output power at different rated speeds. These opposing factors should be optimized when designing such (CSMWTs) with a maximum power-output. In doing so, one can determine the dependency of the harvested power on the rotor diameter along with the electric load resistance. Based on the experimental results conjuncted with a simple output power equation proposed can results in a suitable correction in modelling such micro wind turbines (MWTs). Measurements are performed over two values of air speeds as maximum and minimum boundary and a board range of electric resistive loads. The results shows an optimal combination between the rotor diameter and the rotational speed of the turbines.
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摘要 :
As a result of the noticeable spread of the use of Unmanned Aerial Vehicle (UAV) in many fields, a great effort has been made regarding the research and development of UAVs, especially flight tests. Typically, Flight tests consist...
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As a result of the noticeable spread of the use of Unmanned Aerial Vehicle (UAV) in many fields, a great effort has been made regarding the research and development of UAVs, especially flight tests. Typically, Flight tests consist of a set of maneuvers designed to evaluate one or more of the aircraft characteristics (aerodynamics, performance, stability and control). The obtained characteristics ar typically used to check the satisfaction of the desired design requirements for new/modified UAVs or even establish flight safety criteria and regulations. As flight testing is a hazardous endeavor with critical requirements for aircraft safety, a well-designed plan is needed to prevent accidents while performing the test on schedule. The current work aims to present a technical procedure to measure some of the performance parameters through flight testing. So, flight tests are held to a small tail-less UAV in order to check whether this UAV accomplishes the intended mission by measuring its performance characteristics. In doing so, a flight test program is designed to measure the take-off speed, the stall speed, and the rate of climb. In order to measure these parameters, Pixhawk 4 (PX4) system is selected as an onboard instrument for data recording. Additionally, the post-processing analysis is done through a graphical user interface application developed by MATLAB/App-Designer. Finally, the measured parameters are compared to the design requirements and showed a good agreement.
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