The wind turbine includes a tower , a nacelle , and blades The nacelle is seated on the top of the tower to be secured thereto. The tower may 20 be fabricated in the form of a hollow steel structure, and may be built high by stacking up cylindrical members in several stages using a crane. Each blade is coupled to a gearbox in the nacelle to convert kinetic energy generated by the blade into electric energy.
The hub is coupled to a main shaft The main shaft is 6 rotatably fastened to the gearbox in the nacelle , so that a coupling structure of the blade with the gearbox is completed. Next, the nacelle cooling system for the wind turbine 5 will be described. The nacelle includes the gearbox , a generator , an inverter , and a control cabinet The gearbox transmits high-speed rotational kinetic energy through a power transmission shaft to the generator The generator has 10 therein a stator not shown and a rotor not shown coupled to the power transmission shaft , and generates electricity when the rotor rotates around the stator at high speed.
The inverter functions to remove impure noises from electric energy induced in the generator A channel not shown is formed in the cooling block so that coolant flows through the channel. In a similar manner to the gearbox , the 20 generator and the inverter may be also provided with cooling blocks , , and The cooling blocks have channels to permit coolant to flow through them. The channels may be continuously arranged in a zigzag fashion to enhance cooling efficiency.
The cooling block 25 is preferably made of a metallic material possessing superior heat conductivity, because the cooling block must absorb heat generated by heat generating devices and 7 then discharge the heat to the coolant. The cooling blocks are coupled to a passage pipe in such a way as to communicate therewith. The passage pipe moves the coolant absorbing heat from each cooling 5 block to a primary heat exchanger , so that a heat exchange process is performed.
Preferably, the passage pipe is made of a heat insulating material so as to prevent heat from being transferred to the inside of the nacelle while the coolant flows in the passage pipe It is 10 preferable that the coolant be water in terms of cost and cooling effect. However, in order to enhance cooling efficiency, oil or gas may also be used as the coolant. A pressure gauge and a valve not shown may be installed at the passage pipe The pressure gauge 15 senses the pressure of the coolant which flows in the passage pipe , and transmits the pressure to a controller which is electrically connected thereto.
The controller selectively opens or closes the valve, thus preventing excessive pressure from being applied to the 20 passage pipe The primary heat exchanger is provided on the outer surface or rear end of the nacelle , and a first blowing fan is mounted on an end of the primary heat exchanger to permit the inflow of air.
The primary heat 25 exchanger is provided on the outside of the nacelle , thus enhancing the space utilization of the nacelle , and preventing unnecessary waste heat generated by the 8 heat exchange process from being transferred to the inside of the nacelle Herein, the cooling blocks are coupled to one passage pipe to perform the heat exchange process.
The nacelle cooling system is provided with a secondary heat exchanger that may absorb heat generated 10 in the nacelle via the air and discharge the heat to the outside of the nacelle The secondary heat exchanger functions to cool air having temperature increased by parts which are not directly connected to generate power but generate heat, for example, the control 15 cabinet , a power supply, a power cable, etc. The secondary heat exchanger includes ducts and , heat generating members , and heat transfer mediums The first duct is provided inside the nacelle to permit the inflow of hot air, and a second 20 blowing fan serves to forcibly introduce air into the first duct Meanwhile, the second duct is provided outside the nacelle to permit the inflow of cooling air, and a third blowing fan serves to forcibly introduce cooling air into the second duct The heat transfer mediums are arranged at predetermined intervals in such a way as to cross the heat generating members Each heat transfer medium may comprise a 5 heat pipe.
Each heat transfer medium contains a refrigerant, thus receiving the internal heat of the nacelle from the first duct and discharging the heat to the outside of the nacelle View 5 excerpts, references methods and background. View 2 excerpts, references methods. Wind turbine's tower-nacelle model with magnetorheological tuned vibration absorber. The paper addresses the design of laboratory test rig of wind turbine's tower-nacelle model with horizontally aligned magnetorheological tuned vibration absorber.
Several model constraints are … Expand. View 2 excerpts, references background and methods. The paper addresses the consecutive development stages of laboratory model of wind turbines tower-nacelle system with horizontally aligned tuned vibration absorber at its top. To cope with system … Expand. View 7 excerpts, references methods and background. Effects of a vibration mass damper in a wind turbine tower. Investigations are performed using structural … Expand.
View 2 excerpts, references background. Performance analysis of individual blade pitch control of offshore wind turbines on two floating platforms. A paper presents analysis of dynamic similarity between full-scale wind turbines tower-nacelle system and its laboratory model.
As a reference real-world structure, Vensys 82 wind turbine was … Expand. View 8 excerpts, references methods and background.
MR damper based implementation of nonlinear damping for a pitch plane suspension system. Suppression of vibration transmission from working machineries and other sources is important for the normal operation of a wide range of engineering systems.
Traditionally, viscous dampers with … Expand. View 4 excerpts, references background, methods and results.
Two methods for estimating aeroelastic damping of operational wind turbine modes from experiments. Therefore, the increase in air passenger traffic and subsequent demand for new aircraft are expected to drive the growth of the global aircraft engine nacelle market during the forecast period. North America accounted for Asia-Pacific accounted for the third-largest market share in Asia-Pacific is expected to be the fastest-growing market for aircraft engine nacelle during the review period.
Global Aircraft Engine Nacelle Market has been segmented based on type, material, application, and region. By type, segments of the market are rear mounted nacelle, pylons under wing, clipped at wing, and others. By material, the market has been classified as composites, titanium alloys, nickel chromium, stainless steel, and aluminum alloys. Based on the application, the market has been divided into civil jet aircraft, business jet aircraft, private jet aircraft, and others.
The nickel alloys segment is expected to grow at the highest CAGR during the forecast period. Nickel chromium has good hardness, strength, and corrosion-resistant characteristics and is used in heat-processed forgings that need higher hardness and strength as compared to plain carbon steels. Owing to their excellent corrosion resistance and good hardness nickel chromium alloys have been widely used in aircraft components from the last few years.
Thus, the nickel-chromium segment is expected to register a CAGR of 9. The segment accounted for a larger market share of Regional Analysis. North America accounted for the largest market share in It is expected to be the largest market for aircraft engine nacelles during the forecast period. The regional market growth is primarily driven by the high product demand from the players based in the US and Canada. It is expected that approximately 10, aircraft would be in service in the region by , which is expected to create additional opportunities for the players operating in the North America aircraft engine nacelle market.
Moreover, the increasing revenues of airlines headquartered in the region are also projected to boost the growth of the market.
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