Results 71 to 80 of about 10,232 (233)

Identification and dual adaptive control of a turbojet engine [PDF]

The objective of this paper is to utilize the design methods of modern control theory to realize a dual-adaptive feedback control unit for a highly nonlinear single spool airbreathing turbojet engine.
Leininger, G., Merrill, W.
core   +1 more source

Investigation of the stall-induced shock wave (hammershock) at the inlet to the engine [PDF]

The peak static pressures measured at the inlet to the engine during stall are presented for a turbojet and two turbofan engines. It is shown for one turbofan and the turbojet that the static pressure ratio across the hammershock does not exceed ...
Kurkov, A. P., Moss, J. E., Soeder, R. H.   +2 more
core   +1 more source

Acoustic transmission and reflection by a shear discontinuity separating hot and cold regions [PDF]

, 1972
Acoustic transmission and reflection is analyzed for plane waves propagating from a hot moving medium, impinging on a plane shear discontinuity into a cold stationary region.
Candel, S. M.
core   +1 more source

Linear dynamic mathematical model and identification of micro turbojet engine for Turbofan Power Ratio control

Aviation, 2019
Micro turbojets can be used for propulsion of civilian and military aircraft, consequently their investigation and control is essential. Although these power plants exhibit nonlinear behaviour, their control can be based on linearized mathematical models
Khaoula Derbel, Károly Beneda
doaj   +1 more source

Turbojet engine blade damping [PDF]

The potentials of various sources of nonaerodynamic damping in engine blading are evaluated through a combination of advanced analysis and testing. The sources studied include material hysteresis, dry friction at shroud and root disk interfaces as well ...
Cutts, D. G., Sridhar, S., Srinivasan, A. V.   +2 more
core   +1 more source

Experimental Investigation of Particulate Number Measurement Methodology for Micro-Turbojet Engine Emissions

Aerospace
Increasing aviation activities have heightened concerns about particulate emissions from aircraft engines. Current ICAO standards mainly focus on large civil turbofan engines, leaving a gap in the research on PN emissions from small aircraft engines ...
Zheng Xu, Minghua Wang, Guangze Li, Xuehuan Hu, Pengfei Yang, Meiyin Zhu, Bin Zhang, Liuyong Chang, Longfei Chen   +8 more
doaj   +1 more source

Variable geometry aft-fan for takeoff quieting or thrust augmentation of a turbojet engine [PDF]

A concept is presented that combines the low-noise and high-thrust characteristics of a turbofan at takeoff, together with its high efficiency at subsonic flight speeds, with the high efficiency of a turbojet at supersonic cruise.
Evans, D. G., Weber, R. J.
core   +1 more source

The endurance tests of the aeronautical equipment components by mathematical statistics application

Vojnotehnički Glasnik, 1998
The endurance test results of two representative components of turbojet engine are analysed using methods of mathematical statistics. The first test is related to endurance of the fuel pump, and the second one to the micropumps investigations. Researches
Dragoljub Vujić
doaj   +1 more source

Energy, exergy, thermoecologic, environmental, enviroeconomic and sustainability analyses and assessments of the aircraft engine fueled with biofuel and jet fuel. [PDF]

J Therm Anal Calorim, 2023
Akdeniz HY, Balli O, Caliskan H.
europepmc   +1 more source

Abating exhaust noises in jet engines [PDF]

, 1974
A noise abating improvement for jet engines including turbojets, turbofans, turboprops, ramjets, scramjets, and hybrid jets is introduced. A provision is made for an apparatus in the primary and/or secondary flow streams of the engines; the apparatus ...
Schwartz, I. R.
core   +1 more source