Results 11 to 20 of about 7,514 (171)

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   +4 more sources

Experimental Investigation of a Micro Turbojet Engine Chevrons Nozzle by Means of the Schlieren Technique

Inventions, 2023
In connection with subsonic jet noise production, especially regarding the hot jet from a micro turbojet engine, we encountered a lack of recent high-resolution data in the literature describing the flow field using experimental validation through ...
Grigore Cican, Mihnea Gall, Alina Bogoi, Marius Deaconu, Daniel Eugeniu Crunțeanu   +4 more
doaj   +3 more sources

Experimental investigation of infrared signal characteristics in a micro-turbojet engine

The Aeronautical Journal, 2019
ABSTRACTInfrared signal measurements from a micro-turbojet engine are conducted to understand the characteristics of the engine performance and the infrared signal by varying the exhaust nozzle configuration. A cone type nozzle and five rectangle type nozzles whose aspect ratios vary from one to five are used for this experimental work. As a result, it
S. M. Choi, S. Kim, R. S. Myong, W. Kim
core   +6 more sources

Numerical Simulation of Combustion Chamber for Button Turbojet Engine

MATEC Web of Conferences, 2016
To provide reference data for ultra-micro combustor, a new type button turbojet engine was designed and simulated the combustion’s steady-state process.
Ma Hongpeng, Fang Shuzhou, Gao Hang, Li Teng, Fang Guanlin   +4 more
doaj   +3 more sources

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   +3 more sources

A denoising method for aeroengine gas path electrostatic signal of low signal-to-noise ratio based on IMFs optimized reconstruction and wavelet threshold [PDF]

Scientific Reports
Electrostatic monitoring technology for aero-engines has demonstrated considerable capability in early fault warning. However, raw electrostatic signals often contain significant noise and exhibit low signal-to-noise ratios, making denoising essential to
Chaoying Yan, Yan Liu, Feng Lu
doaj   +2 more sources

Investigation of thrust vector angle control law based on micro-turbojet engine

AIP Advances, 2022
The fluid thrust vectoring nozzle has a fixed profile, few moving parts, and lightweight structure, providing effective flight control for high maneuvering aircraft. The nonlinear control law of the jet deflection angle is one of the critical problems of
Shaoqing Chi, Yunsong Gu, Dongsheng Gong, Linkai Li   +3 more
doaj   +2 more sources

Self-tuning speed and flow control of micro turbojet engines based on an improved evolutionary strategy

Automatika
At present, the controllable parameters of micro turbojet engines in engineering applications are mainly speed-fuel flow (hereinafter referred to as flow) control, in which closed-loop proportional–integral–derivative (PID) control is mostly used to ...
Q. Gao, Jiahao Li, Yuxin Zhang
doaj   +3 more sources

Prediction of performance characteristics of an experimental micro turbojet engine using machine learning approaches

Energy
The continuous growth of the world population leads to an increase in energy demand, which poses challenges to sustainable energy supply. Predicting aviation engine performance according to its own characteristics is very important in ensuring sustainability.
Håkan Aygün, Ömer Osman Dursun, Kadir Donmez   +2 more
exaly   +3 more sources

High-Speed, Maneuverable, and Terrain-Adaptive Micro-Robot with Tree Frog-Inspired Bionic Feet. [PDF]

Adv Sci (Weinh)
A 7.5 mm micro‐robot integrates tree frog‐inspired bionic feet with an electromagnetic linear motor to achieve high‐speed locomotion, slope climbing, and precise turning. It reaches 39 body lengths per second and ascends 30° slopes. The system demonstrates strong potential for inspection tasks in confined and complex environments, such as micro‐aero ...
Zhao W, Li S, Zhang K, Zhang W, Liu D, Fang W, Zhai Y, Lei K, Zhang L, Chen H, Xu T.   +10 more
europepmc   +2 more sources