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Open AccessProceedings ArticleDOI

The Selective Bleed Variable Cycle Engine

Marco A. R. Do Nascimento, +1 more
TLDR
In this paper, a variable cycle jet engine for a supersonic STOVL aircraft is described, which is the selective bleed turbofan, a two shaft three compressor engine.
Abstract: 
A new concept in aircraft propulsion is described in this paper. A variable cycle jet engine is being investigated for a supersonic STOVL aircraft. The engine is the selective bleed turbofan, a two shaft three compressor engine. At low flight speeds this engine operates as a medium bypass turbofan, and for the supersonic cruise condition it operates as a low bypass ratio turbofan in the dry mode.In this paper, the performance of the engine and some of the components is analysed. Off-design engine performance characteristics are explained, compressor running lines are shown, and variable geometry requirements are described.The performance analysis shows that fuel savings are significant, thus reducing aircraft take-off weight. The major advantage of this engine is that all the components are employed all the time, for all operating modes, thus incurring low weight penalties.Copyright © 1991 by ASME

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Journal ArticleDOI

Integration of high-fidelity model of forward variable area bypass injector into zero-dimensional variable cycle engine model

Fu Song, +4 more
- 01 Aug 2021 - 
TL;DR: Based on the performance curves for single bypass mode and the regression model of multi-scale support vector regression for double bypass mode, the high-fidelity model can predict FVABI performance accurately and rapidly and the multi-level model has good convergence and it can predict VCE performance when the F VABI inner bypass is chocked.
Journal ArticleDOI

Predicted performance characteristics of a variable cycle turbofan

I. Ulizar, +1 more
- 01 Jul 1997 - 
TL;DR: In this paper, the authors describe the selection of the main engine design parameters in the HP mode and outline the challenges to be met to enable the powerplant to operate in the other mode.
Journal ArticleDOI

Control Optimization of the Transient Performance of the Selective Bleed Variable Cycle Engine During Mode Transition

U. T. J. Grönstedt, +1 more
- 01 Jan 2002 - 
TL;DR: In this article, a sequential quadratic programming (SQP) is applied to the nonlinear transient engine model directly, in order to solve the multivariable control problem, and it is predicted that the mode switch can be carried out safely without violating the constraints and that the time required is limited by the actuator time of the hydraulic system.
Journal ArticleDOI

Variable cycle jet engines for a Mach 2.7 supersonic civil transport

L. Aleid, +1 more
- 01 Jan 1998 - 
TL;DR: In this paper, the authors compared three different variable cycle jet engine concepts for future SSTs: the turbofan-turbojet, the mid-tandem fan engine and the double bypass engine.
Journal ArticleDOI

On the mode transition of a double bypass variable cycle compression system

Baojie Liu, +2 more
- 01 Mar 2020 - 
TL;DR: In this article, the flow patterns and matching characteristics of each working component during mode transition were investigated using numerical simulation, and it was shown that transition from the single bypass mode to double bypass mode by opening the mode selector valve alone would increase the fan operation point while decreasing that of the core driven fan stage.