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Dual-operation powerplants for vertical take-off transport aircraft: a preliminary analysis of several gas-turbine cycles

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.4224/40003678
AuthorSearch for: 1
Affiliation
  1. National Research Council Canada. National Aeronautical Establishment
FormatText, Technical Report
Physical description25 p.
Abstract
Cycle calculations are presented for dual-operation gas-turbine powerplants intended for use in VTOL aircraft. Cruising thrust is produced by expelling the working gas through propelling nozzles, and hovering lift is produced by expanding the working gas through turbines which in turn drive thrust augmentors (fans or propellers). These powerplants can provide good matching between the hovering and cruising power requirements of a VTOL aircraft, and offer an important safety feature in that they lend themselves to pneumatic interconnection or common ducting of the gas generators and turbines. A hot single-stream cycle appears to enjoy the best over-all thermodynamic performance if no limit is placed on the interconnecting duct temperature. If lower duct temperatures (less than 500°C. ) must be used, a mixed-stream cycle appears more attractive. While very low duct temperatures (less than 200°C.) may be achieved with dual-stream cycles, the performance obtained is generally inferior. Tipjet drives may be used in place of conventional power turbines to drive the thrust augmentors, but are more suited to large rotors of low disc loading.
Publication date
PublisherNational Research Council Canada
Series
  • Laboratory Report (National Research Council Canada. National Aeronautical Establishment. Engine Laboratory), no. LR-201 (30 July 1957).
LanguageEnglish
Peer reviewedNo
NRC numberNRCC-0005814
NRC-5814
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Record identifier36b3360f-409d-46a0-8162-6fc3423be211
Record created2025-09-03
Record modified2025-11-03
Date modified: