Wind tunnel testing of an axisymmetric isentropic relaxed external compression inlet at Mach 1.97 design speed

Timothy R. Conners, Jason M. Merret, Donald C. Howe, Kathleen M. Tacina, Stefanie M. Hirt

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An alternative inlet design method employing isentropic relaxed compression has been developed by Gulfstream Aerospace Corporation for improving net propulsion system performance and reducing sonic boom strength. To substantiate results from prior analytical studies and to provide an experimental database for subsequent research, a wind tunnel test was conducted using a family of subscale axisymmetric relaxed compression inlet models designed for an incoming flow speed of Mach 1.97. All tests were performed in the 1 ft by 1 ft supersonic wind tunnel at NASA Glenn Research Center. Focusing on internal flow characteristics, a large database comprising nearly 1500 test runs was acquired, covering a range of subsonic diffuser Mach numbers, diffuser lengths, mass flow rates, and angles-of-attack. Differences in flow properties between inlet models were surprisingly modest despite significant changes in hardware geometry. Strut effects were noteworthy for all model designs. Comparisons with CFD proved the analytical methodology to be reliable for this application. The large experimental database will be used for additional analytical methodology development, design work, test planning at larger scale, and the development of non-bleed surface treatment concepts for boundary layer control.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference
Pages702-713
Number of pages12
StatePublished - Dec 10 2007
Externally publishedYes
Event43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference - Cincinnati, OH, United States
Duration: Jul 8 2007Jul 11 2007

Publication series

NameCollection of Technical Papers - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference
Volume1

Other

Other43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference
CountryUnited States
CityCincinnati, OH
Period7/8/077/11/07

ASJC Scopus subject areas

  • Space and Planetary Science

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    Conners, T. R., Merret, J. M., Howe, D. C., Tacina, K. M., & Hirt, S. M. (2007). Wind tunnel testing of an axisymmetric isentropic relaxed external compression inlet at Mach 1.97 design speed. In Collection of Technical Papers - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference (pp. 702-713). (Collection of Technical Papers - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference; Vol. 1).