Large flow wide bowstring is swept past after overview of technology of lamina of composite material fan

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Fan lamina is the important part of eddy fan engine, closely related the function of eddy fan engine and its development. Primary fan lamina data is titanium alloy, use sincere, narrow the bowstring, structure that takes damp protruding stand. Now, fan lamina already improved in respect of material, structure a lot of: To enhance tigidity, prevent vibration or flutter, improve the pneumatic efficiency of fan lamina, replaced with wide bowstring structure narrow bowstring, belt construction of damp protruding platform; To reduce weight, the core that use clip or hollow structure replaced sincere structure; To increase flow-rate ratio, improve propulsive efficiency of engine of fan of big thrust eddy, fan rotor diameter already increased 3242mm, fan apex speed already was as high as 457m/s. These material height of new, leaf, Xie Xian the figuration technology of the fan lamina with wide, complex structure is very sophisticated, accordingly, the figuration craft of fan lamina is one of crucial production technologies of eddy fan engine from beginning to end. Modern trade asks to fly higher with jet aircraft, faster, quieter, and the motivation of aircraft engine and efficiency are afraid that some make the cogent dominant position that improves the person that also can be shipping to bring competition to go up then. Large flow wide bowstring is swept past after lamina of composite material fan is to answer engine of modern turbine fan admits need, a when be applied on GE90 and GEnx series engine by research and development of American GE company new technology. The achievement of the first application of technology of GE company composite material is the fan lamina of GE90. This also is one can design the new technology that large aviation engine draws lessons from new generation of research and development for Chinese aviation industry. Large flow wide bowstring is swept past after the material of lamina of composite material fan and progress are on GE90 series engine, american GE company strengthens composite material of tall tenacity epoxy resin to replaced titanium alloy to make the biggest fan blade on current world with carbon fiber. This kind new-style wide bowstring the technical key of lamina of composite material fan is his new answer synthesis craft, design and making blade of this kind of fan should risk risk of very old technique. Fight to raise blade statified function and shear strength, american GE company grew a kind to say for energetically god 8551 - the oxygen of the annulus that add pliable but strong of 7 ／ IM7 / black lead fiber, triumphant Fu was joined to pull particle in epoxy resin. Like the argument that composite material uses on 787 planes wing and airframe, composite material is lighter, can reduce oily cost; Still do not happen at the same time corrode, thereby managing upkeep costs. To regard its as the crucial technology of engine of new generation low noise, low cost composite material technology, GE company undertook for this is as long as 30 old effort and research. Go up century technology of lamina of 90 time composite material is mature with each passing day, make its can be used on GE90-76B engine. The model of 3 dimension pneumatic at that time makes GE company is made have high flow, hind sweep past model lamina of wide bowstring fan, the hollow lamina that the low density advantage of composite material lamina makes lamina of composite material sincere more popular than at that time is light 10% . According to statistic, composite material is lighter than titanium 66% , and intensity is high 100% . In the composite material blade that uses in the design of GE90-115B engine, by 400 beforehand dip belt is made, cong Xiegen is chased to Xie Jian decrescent thin. Because the composite material of apex brim has,come off incline to, because of this leading edge, Xie Jian and tailing edge Bao Youtai joins a metal bar, the content outside can making injures energy be able to abreaction. Through 10 years run the flight that reachs 6.5 million hours, only lamina of 3 composite material because outside content batter and be changed to come down. GEnx engine besides lamina of use composite material, still in blade swallow end board place used teflon wear-resisting pad, its unlike metal can produce wear and tear in that way, also unlike metal needs to repeat in that way change. As fan dimension increase, engine weight also is increased, but because cool,the improvement of the technology, material that heat up end and optimized pneumatic power load make core engine measure narrow. A330, Boeing 767, the 747 fan that wait for the CF6-80C2 motor that uses on the plane occupy Boeing only 21% of engine gross weight. And 33% what the fan of the GEnx-1B motor that uses on Boeing 787-8 plane held engine gross weight. Shape of engine of GE90-115B of craft characteristic 　 new-style large flow wide bowstring is swept past after curving leading edge the fan Xie Gao of composite material lamina 1.

1m, chord 0.

61m, 3242mm of fan rotor diameter, fan apex speed amounts to 360 ～ 390m/s. Of lamina of this kind of new-style fan answer synthesis craft includes: New compound craft model, advanced sensor and data collect system, data - information changeover technology, compress shape the small measure model that craft, high-pressured solidify craft and imitate processing use. Blade is with macerate of hundreds classics colophony beforehand dip gauze takes Cong Xiegen Xiang Xie is pointed with small kind undertakes voluble mould pressing figuration and be being become gradually, legal system of mould pressing figuration builds colophony radical the specific process of lamina of composite material fan is as follows: Above all, with pattern plate law or die law intercept each lay up, because the dimension size of every lay up is differ, will determine its size with computer lofting technology. Ever since, will different lay up is with be being installed orderly certainly on the mould, by give craft parameter to undertake solidify. Next, drawing of patterns undertakes machining to blade after drawing of patterns, go burr, nap and bore, go up in shop of blade leading edge by order after glue film, silk screen assembles metallic baffle, heat below certain technology condition again, pressurization solidify. After nap of final drawing of patterns, undertake blowing sand preparation to blade surface, make priming paint, besmear on 0.

2 ～ 0.

The polyurethane painting with large 25mm, wait for its after dry solidify, get containing the lamina of sincere composite material of leading edge protection namely. New engineering technology makes also be not had without furrow already in fan lamina fiber empty. Because the pointed ministry brim of composite material has,come off incline to, tailing edge of blade leading edge, lamina and Xie Jian include alloy having titanium, the content outside can making injures energy be able to abreaction. Of the research and development of company of advantage 　 GE of lamina of Nextpage 　 new-style fan new-style large flow wide bowstring is swept past after curving leading edge lamina of composite material fan makes the fan lamina of engine of modern turbine fan reached a new level. Technology of applied new composite material makes GE90 series engine lighter, fuel efficiency is taller, the fan lamina performance in enlist in army is superior, locomotive efficiency taller, noise is lower. The fan lamina that the fan blade that makes with carbon fiber composite material places core structure than titanium alloy is light, fighting brace up fight flutter performance side especially also excel titanium alloy, fight a bird to attack ability and low noise index to also win the qualified approval of comfortable boat authorities. Of oxygen of annulus of tall pliable but strong the GE90 engine of lamina of composite material fan already held Yu Bo news 777 planes, use in operation of devoted 1995 line. This technology shows scene in use time of more than 10 years, need not safeguard of routine in battle. New-style fan of type large size is swept past to have a lot of advantages after curving leading edge, if can design inferior fan rotate speed, reduce fan weight and improve pneumatic character to wait, the contain line that increased engine thereby is compared, reduced noise. The centrifugation that structure of lamina of fan of type wide bowstring sweeps past to be able to make exotic passes fan lamina after curving leading edge at the same time and be swung into fan contain path, prevent its to enter low-pressure compressor, the outside fighting content that enhanced engine injures ability. This also is to curve leading edge hind to sweep past structure of lamina of fan of type wide bowstring to apply extensively at the main reason on engine of fan of new-style and large eddy. Outside the GE90 of the company that divide GE and GEnx engine, each are new-style engine if engine is allied (comprise hand in hand by GE and P&W) the fan lamina of the TRENT900 of the GP7200 engine of development and development of company of R of British R · and TRENT1000 engine although material each different, but appearance is to curve leading edge hind to sweep past structure of type wide bowstring. This new technology uses on engine of fan of turbine of new-style big thrust, what for new generation the user place of wide body and large airlines brings is the taller efficiency, lower operation cost, bigger profit, security that continues to maintain Gao Shuiping at the same time and dependability. The development on GEnx of new generation engine is new-style large flow wide bowstring is swept past after curving leading edge technology of lamina of composite material fan achieved further progress on the fan of new generation turbine in GE company. Compare with GE90 engine, the fan lamina number of engine of fan of turbine of new generation GEnx is fewer (GE90-115B has 22 fan blade, and the fan lamina number of GEnx is 18) , the weight that reduced fan further blade movement efficiency is taller also at the same time. Because reduced the wind resistance of glide fan lamina, the noise of engine is consequently lower also. GEnx in blade swallow end board place still used teflon wear-resisting pad. Because lamina of composite material fan can be decreased,weigh, GE company asks the fan casing of GEnx engine also uses composite material, but the intensity of the composite material casing that sheet of inchoate try out twines is not quite high, convert after composite material fiber braids what legal system becomes to weave cloth, making up cloth center to spread the 3rd braid to make intensity problem is able to solve. Casing uses this kind of 3/10 inch (0.

76cm) thick 3 axes basketwork and 2 dimension basketwork mix the basketwork technology that invent to be made. Braid used automation technology. Casing of composite material fan results from GE is in Boeing the predecessor of 787 " sonic cruise person " development works, used many 100 wainscot to undertake the experiment is designed with test and verify pounding; The experiment makes clear, casing of composite material fan external of content fight mauled ability to exceed aluminous casing. Go up to use the turbine fan reaction engine of casing of composite material fan and fan lamina exclusively as the world, the wear of GEnx is taller, weight is lighter, use cost is lower, at present investment uses excel of its noise level any one model GE civil engine. Additional, GEnx still used a kind of new-style firebox, the oil gas before igniting through rising mixes efficiency, reduced azotic oxide considerably (NOx) discharge a level. GEnx is engine of fan of the new generation succeed of series of GE company's most reliable, best-selling CF6 of engine of wide system aircraft turbine, compare with CF6 engine, GEnx improved oily bad news and effective load performance greatly, 3 kinds when already was being developed now new-style wide system plane selects dynamical plant, at present order number already exceeded 800. The success of GEnx engine is attributed to its technology character greatly, and the GE90 motor that 777 planes use Boeing shows in outstanding watch of the whole world. Be in just about of this GE90 engine derive model on engine, GE company promotes composite material technology to acme. Metallic radical took a way that differs with GE company on the research of company of P&W of United States of lamina of composite material fan in lamina of composite material fan, lamina of fan of a kind of when they are developing new-style composite material namely the titanium that successive carborundum fiber enhances base lamina of composite material fan. The titanium that carborundum fiber enhances base composite material can make the intensity of fan lamina rises 50% , hardness also compares common titanium alloy taller. Carborundum fiber enhances titanium radical composite material is hollow blade is one kind uses take shape exceeding model / diffuse the fan blade that join craft makes, its weight is light, rigid good, be able to bear or endure bump collapse strength tall, can make class decreases the fan of engine to be made an appointment with again again 14% . Metallic radical the production process of lamina of composite material fan is as follows: Above all carborundum fiber (SCS-6) and titanium alloy (Ti-6Al-4V) makes titanium face plate, it treatment becomes wedge board after classics X ray, ultrasonic, metallographic and dimension examination are eligible, reoccupy exceeds model figuration / diffuse join craft makes it figuration board. Be opposite next figuration board undertakes dimension and nondestructive detect, in order to ensure metallic radical composite material is significant link and figuration, in-house flawless, surface is flawless, enhance fiber not to have any change, assure envelope and core board join is seamed, diffuse the join quality of join face. The figuration that will check qualification again board, by fan dimension requirement makes blade fold board package, with figuration exceeding model / diffuse join craft figuration. Blade envelope ply decreases successively to Xie Jian from root ministry. The production method of envelope is will one-way permutation SCS-6 fiber and titanium interweave fabric (fiber of control of the foil that use titanium is removed) ask to decide envelope number of plies according to ply, be united in wedlock in the static inner diffusion pressing coal tub such as heat finally. Large flow wide bowstring is swept past after the last word lamina of composite material fan is a when be applied successfully on GE90 and GEnx series engine by research and development of American GE company new technology. This is complete can supply Chinese aviation industry relevant personnel is designing what new generation of research and development draws lessons from when large aviation engine. The article only hind sweep past large flow wide bowstring the material of lamina of composite material fan and craft undertook simple and compendious introduction and analysis, unavoidable of the work is far from complete. Expectation is right the personage can be edified somewhat related aviation industry. Current aviation produces technical change with each passing day, hope China is on the motor of not far fan of new generation turbine that can use this technology his one day in the future. CNC Milling