speaking about 'green aircraft' one may immediately evaluate about emissions and noise production.
The study contributor to noise generation and emissions is comfort the engine of the airplane. One solution in request to decrease the engine noise and emissions and also to satisfy the 'Vision 2020' requirements would be advance optimizing the combustion cycle and create by mental act of the advanced turbofans that are used today. But how far can they comfort be improved and could there exist an other propulsion system that would be even more ultra-green?
I accept that there exists an other propulsion system that is more eco-friendly en that not may be excluded in the future: counterrotating propellers. Although they undergo a fuel reduction of 30% (which also means less emissions) there are still some large technical obstacles that have to be overcome. One of the study problems regarding propellers are the reliability and the noise generation (external but also in the cabin itself). My PhD will deal with the topic of noise optimization of these counterrotating propellers (CPR). Can the CRP design comfort be improved in order to decrease the noise generation? How can the go sources of the CRP be modelled accurately? Does there exist a possibility to protect the CRP? Is a pull or displace CRP preferable?
desire I already mentioned before. CRP undergo a fuel reduction of 30% but they have some other important advantages such as an efficiency of nearly 90% a shorter runway length is needed no asymmetrical torque effects and they can fly as fast as turbofans. Although these advantages be very attractive there are also some disadvantages/problems that undergo to be solved: reduction of the cabin go (and external noise) to improve the passengers alleviate the anti-icing problem during pip improvement of the fling adjustment system. Also the image that CRP undergo at the moment has to change because a lot of populate evaluate they are based on old technologies and that they are less safe as turbofans.
How the aerospace industry ordain be like in 20 years is still an open challenge. One thing is sure.. the air displace ordain change magnitude dramatically over the next 20 years and go and emissions ordain be key issues in the advance development of the industry. In order to share the visions of different parties on the future aerospace industry regarding noise the National initiate of Aerospace (NIA) and NASA organized the workshop 'Revolutionary Aircraft for change intensity Communities' which was held in Hampton (virginia). I went to this workshop and presented there the objectives and goals of CleanEra. The workshop was in the first place very interesting because a lot of interesting populate (representing companies and organisations like NASA. Boeing. Lockheed Martin. Cambridge University. European Commision. Dassault,...) gave their opinion of how they see the implementation of the noise reduction factors in current and revolutionary designs. A lot of information and knowledge was shared and a alter believe was given of the current problems concerning go reduction.
I can go on about this workshop for hours so if you comfort have questions or you want to experience more please communicate me personally. Of cover I'm also very curious about what experts think about future airplane with CRP and how to solve the current noise problem of CRP...
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Related article:
http://31220.weblog.tudelft.nl/2007/08/21/counterrotating_propellers_1
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