PERFORMANCE AND OPERATIONAL STUDIES OF TWO FULL-SCALE JET-ENGINE THRUST-REVERSER SYSTEMS

1957 ◽  
Author(s):  
Robert C. Kohl ◽  
Joseph S. Algranti
Keyword(s):  
Full Scale ◽  
Jet Engine ◽  
Engine Thrust ◽  
Thrust Reverser

Thrust Nozzles for Supersonic Transport Aircraft

1964 ◽  
Vol 86 (2) ◽  
pp. 97-104 ◽  
Author(s):  
David Migdal ◽  
John J. Horgan
Keyword(s):  
External Flow ◽  
Operating Costs ◽  
Jet Engine ◽  
Transport Aircraft ◽  
Supersonic Transport ◽  
The Past ◽  
Engine Thrust ◽  
Performance Trends ◽  
Flow Effects ◽  
Plug Nozzles

Supersonic transports will require jet-engine thrust nozzles that are highly efficient from take-off to supersonic cruise in order to minimize the direct operating costs. Variable-area ejectors, plug nozzles, and modifications of these basic types have been tested extensively during the past several years. Performance trends for these nozzles are presented with the emphasis on external flow effects. A new ejector which utilizes aerodynamically actuated doors to admit external air into the ejector shroud is discussed.

Attitude control of nanosatellite with single thruster using relative displacements of movable unit

2020 ◽  
pp. 095441002095986
Author(s):  
Anton V Doroshin ◽  
Alexander V Eremenko
Keyword(s):  
Attitude Control ◽  
Center Of Mass ◽  
Angular Position ◽  
Main Body ◽  
Attitude Dynamics ◽  
Jet Engine ◽  
Engine Thrust ◽  
Body Change ◽  
Flexible Rods ◽  
Single Jet

The attitude dynamics of a nanosatellite (NS) with one movable unit changing its angular position relative to a main body of the nanosatellite is considered. This relative movability of the unit can be implemented with the help of flexible rods of variable length connecting the unit with the main body. Change of the relative position of the movable unit shifts the center of mass of the entire mechanical system. The NS has a single jet engine rigidly mounted into the NS main body. The shift of the mass center creates an arm of the jet-engine thrust and a corresponding control torque. Schemes to control the attitude dynamics of the satellite using the movability of its unit are developed, using both the torque from the engine and inertia change.

Designing Clean Jet-Noise Facilities and Making Accurate Jet-Noise Measurements

2003 ◽  
Vol 2 (3) ◽  
pp. 371-412 ◽  
Author(s):  
K. K. Ahuja
Keyword(s):  
Frequency Response ◽  
Internal Noise ◽  
Jet Noise ◽  
Noise Spectrum ◽  
Full Scale ◽  
Research Facility ◽  
High Quality ◽  
Jet Engine ◽  
Noise Measurements ◽  
Noise Data

The main objective of this paper is to provide guidelines for designing and calibrating a high quality, static, jet-noise research facility and making high-quality jet noise measurements. Particular emphasis is placed on methodology for determining if internal noise is dominant in the jet noise spectrum. A section of this document is devoted to clarifying the terminology associated with microphone frequency response corrections and providing a step-wise description of other corrections that must be applied to the measured raw spectra before the jet noise data can be considered accurate and ready for use for extrapolation to full-scale jet engine noise.

scholarly journals Some Details of Jet Engine Thrust

2016 ◽  
Vol 138 (09) ◽  
pp. 76-77
Author(s):  
Lee S. Langston
Keyword(s):  
Momentum Flux ◽  
Energy Input ◽  
Surface Forces ◽  
Second Law ◽  
Jet Engine ◽  
Engine Thrust ◽  
Blade Cascade ◽  
Engine Component ◽  
Airline Passengers ◽  
Frictional Forces

This article throws light on details of jet engine thrust. The momentum flux of the engine exiting flow is greater than that which entered, brought about by the addition of the energy input from combusted fuel, and giving rise to engine thrust. Thrust arises from pressure and frictional forces on these surfaces, e.g., blades, vanes, endwalls, ducts, etc. This interior force view of thrust is easy to visualize but quite another thing to actually measure. In doing research on secondary flow in gas turbine passages, researchers have measured both steady-state momentum changes and surface forces, in the much simpler case of a turbine blade cascade. The thrust values for each component in the Rolls-Royce single spool engine have been shown in this paper. It has been noted that from the compressor, gas path flow enters the engine case diffuser, where a pressure gain produces another component of forward thrust of 2,186 lbt. Newton’s second law of motion allows us to examine engine component behavior that exhibits both forward and rearward propelling forces, which results in the net thrust our airline passengers have purchased.

scholarly journals Comparative study on two civil engine thrust reversers for their maintainability analysis

2018 ◽  
Vol 169 ◽  
pp. 01026 ◽  
Author(s):  
Hua-Cong Xu ◽  
Yang Pan ◽  
Yue-Xi Xiong ◽  
Jing-Wu He
Keyword(s):  
Time Estimation ◽  
Selection Scheme ◽  
Engine Thrust ◽  
Trade Offs ◽  
Kinematics Simulation ◽  
Working Principle ◽  
Maintainability Analysis ◽  
Thrust Reverser ◽  
Scheme Analysis ◽  
Virtual Maintenance

Trade-offs studies on two kinds of existing engine thrust reverser design were carried out, applying virtual maintenance method and the basic theory of ergonomics. Analysis on the maintainability of the two kinds of configurations, the O-duct thrust reverser owning the integrated propulsion system (IPS) and the traditional portal D-duct thrust reverser, were compared. According to the differences of O-duct and D-duct thrust reverser in the structure, working principle and mode of motion during the maintenance, structure modelling and kinematics simulation of two kinds of thrust reverser were finished in the same space constraints. Taking DELMIA software as the platform, the partial ergonomic research and evaluation including accessibility analysis, visibility analysis, specific disassembling and assembling time estimation and workspace analysis were put forward through the virtual maintenance simulation of two civil engine thrust reversers. Supplied technical reserves on design and selection, scheme analysis and technical evaluations for domestic engine thrust reverser in the future.

A Novel Mini Jet Engine Powered Unmanned Aerial Vehicle: Modeling and Control

2021 ◽  
pp. 1-13
Author(s):  
Erdinç Altuğ ◽  
Abdullah Türkmen
Keyword(s):  
Jet Engines ◽  
Flight Duration ◽  
Thrust Vectoring ◽  
Jet Engine ◽  
Modeling And Control ◽  
Engine Thrust ◽  
Heavy Lift ◽  
Aerial Vehicle ◽  
Thrust System ◽  
And Control

Significant progress has been made in recent years on personal air vehicles (PAVs), which offer independent and autonomous urban transportation. On-demand parcel delivery drones and heavy-lift drones are gaining serious attention. Although various designs for these systems have been put forward, they still have not reached sufficient maturity. The current systems provide somehow satisfactory operation, but many of these systems are limited in payload capacity and flight duration, and not suitable for future operations. In this paper, we propose a novel thrust system that uses multiple mini jet engines. Unlike electric motors, the jet engine thrust cannot vary rapidly. This led us to design and develop a thrust vectoring system for each jet engine. This proposed system has the potential to enable drones to carry more payload and achieve longer flight times. This paper discusses the design and modeling of the system as well as the stabilization algorithms that satisfactorily stabilize the proposed system. We presented that due to motor lag, thrust variations cannot stabilize the vehicle. We showed that the use of a thrust vectoring mechanism with LQR-based controller can overcome the effects of motor lag and stabilize the vehicle, successfully.

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