Dr. Rainer Martens, Munich

Towards a new generation of aeroengines − less consumption, less Co 2 and less noise Technology for future aero engines

by Dr. Rainer Martens, Chief Operating Officer, MTU Aero Engines, Munich

Quieter, thriftier and cleaner, that’s what tomorrow’s engines will need to be. MTU Aero Engines has for years been working on new technologies to further improve the environmental com patibility of future engines. The effort is worth the trouble: industry experts see good growth opportunities for aviation. By 2020, they expect air traffic to double. Closely cooperating with the major players in the business, Germany’s leading engine manufacturer develops novel propulsion systems and technologies in all thrust and power categories and is involved in essential national and international research projects.

The future belongs to the geared turbofan (GTF) engine Pratt & Whitney and MTU Aero Engines are collaborating on the PurePower PW1000G engine to develop a game-changing propulsion concept. The new technology holds the promise of reducing fuel consumption and CO2 emissions by 15 percent each, and of cutting present perceived noise levels in half. The concept is catching on with airframers: Airbus is offering the geared turbofan engine for its re-engined A320neo. This could be the application for which the largest quantity of geared turbofans will be required; for the European aircraft manufacturer estimates that the market will need some 4,000 of this type of aircraft, taken over its entire life. Bombardier has also selected the GTF as the exclusive engine to power its new CSeries; Mitsubishi will equip its MRJ with this new type of propulsion system, and Irkut has chosen it for its MS-21.

What sets the new GTF propulsion system apart is that it fea - tures a reduction gearbox between the fan and low-pressure turbine. With today’s engines, the two are seated on a common shaft, and the turbine drives the fan. Uncoupling them allows the fan with its large diameter to rotate more slow ly and the turbine to rotate much faster. This lets the indi vidual components achieve their respective optimum speed, greatly boosting the geared turbofan’s efficiency. The result is a signi - ficant reduction in fuel consumption, emissions of carbon dio - xide and noise; moreover, the propulsion system is much lighter than a conventional engine as it has fewer stages, and hence a lower parts count.

MTU contributes the high-speed low-pressure turbine to the GTF, one of its key components. Germany’s leading engine manufacturer is the sole manufacturer in the world capable of offering this technology. Moreover, Pratt & Whitney and MTU have collaborated to design a new high-pressure compressor. The new transonic compressor will achieve a compression

Dr. Rainer Martens was born 1961, He became Chief Operating Officer of MTU Aero Engines in April 2006. He is a member of the MTU Board of Management with overall responsibility for engineering and production. Dr. Martens studied Mechanical Engineering at Hannover University in Germany and the University of Birmingham to the UK. He holds a doctorate in mechanical engi - neering. Before his current position he was plant and site manager at the Airbus plant in Bremen, after spending five years as the Head of MTU’s manufacturing center for turbine blades, Dr. Martens was previously also Managing Director of CIM-Fabrik Hannover GmbH in Hannover.

ratio of 17:1 with no more than eight stages, and will appreciably enhance efficiency. That’s enough to beat most commercial models by a wide margin. MTU is responsible for the forward four stages and Pratt & Whitney for stages five to eight. The innovative compressor is a 100-percent blisk construction. Blisks (blade integrated disks) are a high-tech rotor design in which the disk and blades are produced as a single piece, eliminating the need for blade roots and disk slots. This increases strength and lowers weight.

Clear Air Engine (Claire) In partnership with Bauhaus Luftfahrt, MTU has developed an ambitious program to reduce the carbon dioxide emissions of aircraft engines. Under the Clean Air Engine (Claire) technology project, a CO2 reduction of up to 30 percent is scheduled by 2035. With the initiative, the ACARE-targets will be clearly exceeded, and noise levels at the same time drastically reduced. The program is bases on the geared turbofan engine and has three stages. Plans are, in the first stage (by 2012), to lower CO2 emissions by about 15 percent and cut the perceived noise levels in half, using technologies that have been matu - red for production by that time. In the second step, the CO2 emission reduction will be raised to at least 20 percent by 2025. The key to success is even more efficient thrust generation − for instance by the further development of the GTF or through the use of a shrouded, counter-rotating fan, the con - cept for which had been developed by MTU already back in the 1980s. By 2035, MTU ultimately expects to achieve the full target of a 30 percent reduction when in the third and last stage, utilization of the energy in the core engine will be further optimized, e.g. by the use of a heat exchanger.

Besides this, MTU has major roles also in the national German Aviation Research Program and the European Union’s Clean Sky, Newac and Dream projects.

Research programmes MTU is the leading industrial partner on the German Aviation Research Program. The company cooperates closely with universities and research institutes, focusing on the development of new improved-efficiency high-pressure compressor and low-pressure turbine technologies. Part of the program, moreover, is devoted to optimizing blisk manufacturing tech - niques. MTU has carved out a globally leading position in blisk technology. New solutions helping to reduce manufacturing costs accentuate the company’s leading position.

• Clean Sky is the largest aviation technology research initiative in the history of the European Union. The program was laun ched in the fall of 2008 and is scheduled to run until at least 2014. As part of the initiative, the leading European en - gine ma nufacturers are building five different engine demonstrators, and MTU is responsible for one of them. The engine is based on geared-turbofan technology. Another focus of MTU’s activities will be on the high-speed low-pressure turbine for the next generation of GTF engines. The aim is to demonstrate the maturity of the technologies for new, lower-weight constructions and materials when subjected to further increased mechanical and thermal loads, and to validate advanced aerodynamic blading designs. These technologies serve to make future GTF engines even more efficient and lighter in weight.

• Newac (New Aero Engine Core Concepts) is a European-level program now about to be completed. Under this program, ma - jor European engine manufacturers led by MTU, and universities and research institutes, focus on new concepts for the core engine, ranging from enhanced conventional gas turbine and intercooled to recuperative engine cores. MTU concentrates on the active control of high-pressure compressors. An attempt is made to make future compressors more efficient.

• Dream (ValiDation of Radical Engine Architecture SysteMs) The objective of Dream technology project is to develop new engine concepts. Partnering with other engine manufacturers, MTU Aero Engines is working on innovative turbine mid structure and smart active clearance control solutions.

With technology activities like these, MTU is solidifying its standing as a partner in cooperative ventures with the leading manufacturers in the business. It excels especially in highpressure compressor and low-pressure turbine technologies, manufacturing and repair techniques.

Congress Languages: English / French / German

The Future of European Security and Defence –time for change

8 – 9 November 2011 andel’s Hotel & Convention Center Landsberger Allee 106 10369 Berlin, Germany

Opening of the 10 th Congress by

• Michel Barnier, Member of the EU Commission, Commissioner for International Market and Services, Brussels • Arnaud Danjean MEP, Chairman of the Subcommittee on Security and Defence of the European Parliament, Brussels • Bogdan Klich, Minister of National Defence, Warsaw • Thomas de Maizière, Federal Minister of Defence, Berlin

90 International Top Speakers, among others • Claude-France Arnould, Chief-Executive EDA, Brussels • IGA Patrick Bellouard, Director OCCAR-EA, Bonn • Jean-Dominique Giuliani, President Robert Schuman Foundation, Paris • Roberto Gualtieri MEP, Member of the Subcommittee on Security and Defence, Brussels • Prof. Dr. Hans-Gert Pöttering MEP, 2007-2009 President European Parliament, Brussels • Christian Schmidt, Parliamentarian State Secretary, Ministry of Defence, Berlin • Jir˘í S ˘ edivy´, First Deputy Minister of Defence, Prague • General Håkan Syrèn, Chairman EU Military Committee, Brussels • Lieutenant General Ton Van Osch, Director General EU Military Staff, Brussels • Robert Walter MP, 2008-2011 President ESDA/WEU Assembly, London/Paris

Keynote Speeches Industry Dell, AGT, Cassidian, Hewlett Packard, Northrop Grumman, Raytheon, SAFRAN