The calculation of the hydrodynamic performance of the propeller and the prediction of the noise performance can provide theoretical support for the efficient advancement of the underwater vehicle and the low noise design. In this paper, a new type of ducted propeller is modelled based on the ...
Theoretical and Analytical Methods Relating to Propeller Action 8.12.2 Ducted Propellers As early as 1879, Parsons fitted and tested a screw propeller having a complete fixed shrouding and guide vanes. However, the theoretical development of the ducted propeller essentially started with the work of Ko...
必应词典为您提供ducted-propeller的释义,un. 装有导流管的螺旋浆;导管推进器;函道螺旋桨; 网络释义: 导管螺旋桨;导罩螺桨;导管桨;
Propeller design requirements are nowadays more and more stringent, demanding not only to provide high efficiency and to avoid cavitation, but including also requirements in terms of low induced vibrations and radiated noise. Ducted propellers may provide the opportunity to reduce these negative effects...
美[dʌkt] 英[dʌkt] n.管道,管子;【电】(电线、电缆等的)管道;【无线电】波道 vt.用管道输送;用管道供应 网络管导式 复数:ducts 同义词 n. channel,canal,pipe,tube,vessel 英汉 英英 网络释义 n. 1. 管,导管,输送管;槽,沟,渠道
[1,2,3,4]. The ducted-fan drone is expected to become the main configuration of UAVs in the future owing to high efficiency and minimal noise [5]. Compared with traditional rotorcraft, ducted-fan drones have propeller or fan blades shrouded by the duct. The duct brings additional thrust ...
Aircraft, and hence propulsion noise, therefore needs to be considered early on, at the conceptual design stage. In this regard, the ducted fan offers potential advantages over the free propeller, typically employed in general aviation (GA) aircraft. This is due to the following: non-propagation...
所以, 研究如何能更准确地预报导管螺旋桨水动力性能非常重要. 来自互联网 4 . EC - 135 Eurocopter helicopters combined with the low noiseductedpropeller end of patented technology. EC-135直升飞机结合欧洲直升机公司的低噪音涵道尾螺旋浆专利技术.
2.Compared with the propeller or the rotor,the ducted fan provides a larger aerodynamic thrust(lift) and the low noise due to the shrouding duct.涵道风扇较同样直径的孤立风扇能产生更大的升力,且风扇环括在涵道内,既可阻挡风扇气动声向外传播,又结构紧凑、安全性高。 3.Some unmanned aerial vehicles...
FIG. 10C is an alternative embodiment of a conventional single propeller wind turbine modified according to the present invention. The wind turbine 1000' has two blades 1002, 1004 mounted on a blade support mechanism 1006'. Unlike the blade support mechanism in FIGS. 10A and 10B, this blade ...