Daimler-Benz Aerospace (Dasa)engine subsidiary MTU has successfully completed the first round of altitude tests on its transonic low-pressure (LP) turbine for an advanced ducted-propulsor (ADP) engine.
The tests were performed in Stuttgart University's high-altitude testing centre, as part of the Engine 3E (environment, efficiency and economy) research programme to develop technology for the next generation of civil-aircraft engines. MTU says that the tests were conducted in conditions simulating flight at 30,000-35,000ft (9,100-10,700m), and demonstrated performance which sets "new standards" internationally.
The turbine was first tested in 1993-4 as part of the ADP demonstrator programme run jointly by MTU, Pratt &Whitney and FiatAvio. According to MTU, the earlier programme was designed to demonstrate the functionality of the ADP concept, and to show the engine's potential economical and environmental benefits.
The demonstrator engine was not tested under simulated flight conditions, however, and no precise assessment of the LP turbine's performance was carried out. This is what MTU is aiming to achieve within the Engine 3E programme, supported by Government funding of a four-year civil-aerospace research programme.
The turbine has only three stages, and operates at higher speeds than conventionally designed units, with internal airflow in the transonic regime. According to MTU, the transonic turbine offers cost, size and weight benefits over conventional designs, having 40% fewer stages and being 20% lighter and shorter than an equivalent conventional LP turbine.
The ADP turbine will now be fitted with improved blades, and further testing is expected.
Source: Flight International
