Next Generation Aero Engines -New concepts to meetfuture environmental and economic challenges

摘要

This paper will address current demands and devel-opments in advanced engine concepts and subsequent compressor and turbine design and technology efforts at MTU. Latest highlights achieved on new high pressure compressor (HPC) and low pressure turbine (LPT) technologies will be presented. Both components constitute key competences for MTU's civil aero engine business. The paper will start with an overview on engine key requirements for the next generation of regional air-crafts expected for the years 2012-2020. Highly de-manding engine requirements will mainly consist of significant reductions in fuelbum and CO_2emissions by more than 20%, noise reductions in the range of -20 to -30dB below stage 4 (cumulative) and NOx emissions that are only 20% of today's engines. In addition, the economic competitiveness will claim for maintenance cost reductions of more than 30% which means an almost double components' life and zero inflight shutdown rates need to be obtained. The engine concepts to address such requirements will include high bypass turbofans that have to be pushed to their limits and more advanced new concepts such as Geared Turbofans and Open Rotor Propfans. Each of the engine concepts will prove their pros and cons. To find the most adequate compromise in terms of engine architecture will be the challenge of the industry. According to MTU's investigations the Geared Turbofan will constitute the best solution. The conventional turbofan will have to overstress its architectural capabilities. The Open Rotor, from present point of view, will require an enormous technological effort for both engine and aircraft to achieve the maturity requested to enter the market. Subsequent to the evaluation of new engine concepts the paper will illustrate the MTU technology and conceptual approach to satisfy the demands. Highly innovative compressor concepts and technologies will be discussed that are presently under validation. The main characteristics of the new compressor concepts are full 3D aerodynamics including casing treatment, all blisk light weight tie shaft rotor, and advanced radial gapping concepts. Dedicated technologies to further support improvements in efficiency, weight, and costs will be highlighted; including potential benefits from advanced control, monitoring and design methodologies.