The North Atlantic Treaty Organization

Abstract

la Validation CFD des organes des propulseurs) edited by J. Dunham Approved for public r»leraö; Dia«ibi.;{ioT' üJV.1'; riled dn Report of the Propulsion and Energetics Panel Working Group 26.According to its Charter, the mission of AGARD is to bring together the leading personalities of the NATO nations in the fields of science and technology relating to aerospace for the following purposes:-Recommending effective ways for the member nations to use their research and development capabilities for the common benefit of the NATO community;•-Providing scientific and technical advice and assistance to the Military Committee in the field of aerospace research and development (with particular regard to its military application);-Continuously stimulating advances in the aerospace sciences relevant to strengthening the common defence posture;-Improving the co-operation among member nations in aerospace research and development;-Exchange of scientific and technical information;-Providing assistance to member nations for the purpose of increasing their scientific and technical potential;-Rendering scientific and technical assistance, as requested, to other NATO bodies and to member nations in connection with research and development problems in the aerospace field.The highest authority within AGARD is the National Delegates Board consisting of officially appointed senior representatives from each member nation. The mission of AGARD is carried out through the Panels which are composed of experts appointed by the National Delegates, the Consultant and Exchange Programme and the Aerospace Applications Studies Programme. The results of AGARD work are reported to the member nations and the NATO Authorities through the AGARD series of publications of which this is one.Participation in AGARD activities is by invitation only and is normally limited to citizens of the NATO nations.* AGARD merged with the Defence Research Group of NATO (DRG) on 1 January 1998 to form the Research and Technology Organization (RTO) of NATO. However, both AGARD and DRG will continue to issue publications under their own names in respect of work performed in 1997. Executive SummaryThe high performance of aircraft turbine engines -mainly oriented towards economy in civil engines and towards performance, economy and off-design reliability in military applications -depends on the correct design of gas flows in the engine. Today, this is mainly done by numerical computer simulation instead of the much more costly experimentation with hardware. The working group undertook to analyse the quality of computer codes in use and to show ways for improvement. Many discrepancies between codes were detected and it was recognized that even the researchers actively working in this field were unaware of the full scale of this phenomenon. The military will gain from the newly designed engines as well as from possible improvement in upgrades. It should be noted that this kind of down-toearth analysis, despite its merits, has not been undertaken on an international basis ou...