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Performance potential of an advanced technology Mach 3 turbojet engine installed on a conceptual high-speed civil transport
| Content Provider | Semantic Scholar |
|---|---|
| Author | Morris, Shelby J. Geiselhart, Karl A. Coen, Peter G. |
| Copyright Year | 1989 |
| Abstract | SummaryThe performance of an advanced technology, con-ceptual turbojet engine optimized for a high-speedcivil aircraft is presented. This information repre-sents an estimate of performance of a Mach 3 Braytoncycle (gas turbine) engine optimized for minimumfuel burned at supersonic cruise. This conceptualengine had no noise or environmental constraints im-posed upon it. The purpose of these data is to definean upper boundary of the propulsion performancefor a conceptual, Mach 3 commercial transport de-sign. A comparison is presented that demonstratesthe impact of the technology proposed for this con-ceptual engine on the weight and other characteris-tics of a proposed high-speed civil transport. Thiscomparison indicates that the advanced technologyturbojet engine described in this paper could reducethe gross weight of a hypothetical Mach 3 high-speedcivil transport design from about 714 000 lb to about545 000 lb. The aircraft with the baseline engine andthe aircraft with the advanced technology engine aredescribed in this paper.IntroductionIn March 1985 the Office of Science and Technol-ogy Policy published the National Aeronautical R&DGoals (ref. 1) and selected three national goals for fu-ture aeronautical research. These goals were1. Subsonic goal: The purpose of this goal wasto develop the technology required "for an en-tirely new generation of fuel-efficient, afford-able U.S. aircraft operating in a modernizedNational Airspace System" to capture "the im-mense civil aircraft market opportunities bytechnologically superseding foreign competi-tive challenges."2. Supersonic goal: The purpose of this goalwas "to attain long-distance efficiency" bydeveloping "pacing technologies for sustainedsupersonic cruise capacity" enabling "linkingof the farthest reaches of the Pacific rim infour to five hours."3. Transatmospheric goal: The purpose of thisgoal was "to secure future options" allowingthe pursuit of "research toward capacity toroutinely cruise and maneuver into and out ofthe atmosphere with takeoff and landing fromconventional runways."This paper will address the second goal (the su-personic goal) and, specifically, propose a propulsionsystem, without environmental constraint considera-tions, which might define an upper limit for a Mach 3Brayton cycle engine optimized for minimum fuelburned at supersonic cruise. The performance limitsas a function of Mach number were examined in refer-ence 2. Some results of this examination are shownin figure 1, which presents the overall efficiency ofthe installed propulsion system as a function of Machnumber. Note that at Mach 3 the projection was foran overall efficiency of approximately 50 to 58 per-cent. (See appendix for efficiency definitions.)The purpose of this paper is to describe an ad-vanced technology propulsion system for a Mach 3supersonic cruise commercial vehicle that satisfiesthe installed overall efficiency goal described infigure 1. The purpose of this engine concept is tosupport various mission studies that examine thetechnical, economic, and environmental feasibility offuture supersonic cruise commercial aircraft. Thispaper will describe the technical background for pre-vious high-speed engine designs and the technologyadvances that would allow us to go from those de-signs to the Mach 3 engine concept described in thepresent paper. This proposed Mach 3 engine con-cept will then be described including its performance,unique features, technology level, weight and scalinglaws, and overall geometry. This engine concept hasbeen optimized for minimum fuel burned at Mach 3and approximately 60 000 ft. The conceptual vehi-cle using this engine will then be described includingthe possible mission profiles and aircraft thrust-to-weight versus wing-loading diagrams (the so-called"thumbprint" sizing chart). Finally, environmentalconcerns will be briefly discussed.SymbolsAAo |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900000718.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
