Results 51 to 60 of about 2,586 (182)

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   +1 more source

A Theoretical and Experimental Investigation of the Effects of Inverted Wings Modifications on the Stability and Aerodynamic Performance of a Sedan Car at Cornering

Engineering Reports, Volume 7, Issue 1, January 2025.
ABSTRACT This research examines the impact of cornering on the aerodynamic forces and stability of a Nissan Versa (Almera) passenger sedan car by introducing novel modifications. These modifications included single inverted wings with end plates as a front spoiler, double‐element inverted wings with end plates as a rear spoiler, and incorporating the ...
Mustafa Sabeeh Abood, IhsanYahya Hussain, Anmar Hamid Ali   +2 more
wiley   +1 more source

Experimental Study on the Effect of Water Injection on a Micro Turbojet Engine

Repüléstudományi Közlemények, 2021
Due to increasing emissions in the 21st century, aviation  industry faces a rising pressure to reduce its contribution to air pollution. A possible way to mitigate such harmful  effects on the environment is to use water injection as a  thrust augmentation method which was developed in the  1960s.
Károly Beneda, Péter Balajti
openaire   +2 more sources

Computational Investigation of the Performance Enhancement of SR3 Propeller With Swirl Recovery Vanes

Modelling and Simulation in Engineering, Volume 2025, Issue 1, 2025.
A rotor in motion transfers energy to the fluid, comprising not only the essential axial component but also a rotating segment that contributes to propeller thrust. This study scrutinizes the effects of integrating swirl recovery vanes (SRVs) with the eight‐bladed SR3 rotor for transonic flows in a tractor prop configuration, examining setups both with
Santhi Raviselvam, Vasanthakumar Parthasarathy, Vijayanandh Raja   +2 more
wiley   +1 more source

Very high cycle fatigue of fiber‐reinforced polymer composites: Uniaxial ultrasonic fatigue

Fatigue &Fracture of Engineering Materials &Structures, Volume 47, Issue 9, Page 3083-3115, September 2024.
Abstract This review explores uniaxial ultrasonic fatigue (USF) testing as a common and dependable method for quantifying the extended fatigue life of fiber‐reinforced polymer (FRP) composites. The objective is to explain the complexities governing the fatigue life behavior of FRPs, particularly in the realm of very high cycle fatigue (VHCF) where the ...
Alireza Behvar, Mahyar Sojoodi, Mohammad Elahinia, Carlo B. Niutta, Andrea Tridello, Davide S. Paolino, Meysam Haghshenas   +6 more
wiley   +1 more source

Novel technique of vibration minimization during hard machining

Engineering Reports, Volume 6, Issue 8, August 2024.
This research study examines the performance of electrorheological fluids, also referred to as smart fluids, which have gained popularity because they instantly alter when exposed to an external magnetic or electric field. When high voltage is applied, the ER fluid quickly changes from a viscous liquid to a semisolid state, which is reversible.
Aditi D. Apte, Shivakumar Shivamurthy, Manjunath G Avalappa, Nikhil Rangaswamy, Ashwini S. Shinde, Satish S. Kulkarni, Mukesh Kumar   +6 more
wiley   +1 more source

Performance and Emissions Assessment of a Micro-Turbojet Engine Fueled with Jet A and Blends of Propanol, Butanol, Pentanol, Hexanol, Heptanol, and Octanol

Fire
This study examines the impact of alcohol blends on the performance and emissions of aviation micro-turbojet engines. Thus, propanol, butanol, pentanol, hexanol, heptanol, and octanol were tested at 10%, 20%, and 30% concentrations and mixed with Jet A ...
Grigore Cican, Valentin Silivestru, Radu Mirea, Sibel Osman, Florin Popescu, Olga Valerica Sapunaru, Razvan Ene   +6 more
doaj   +1 more source

Life cycle assessment of hydrogen production, storage, and utilization toward sustainability

WIREs Energy and Environment, Volume 13, Issue 3, May/June 2024.
The review emphasizes LCA's pivotal role in guiding the hydrogen economy toward a low‐carbon future, positioning hydrogen as a versatile energy carrier with significant potential. Abstract In the pursuit of sustainable energy solutions, hydrogen emerges as a promising candidate for decarbonization.
Ahmed I. Osman, Mahmoud Nasr, A. R. Mohamed, Amal Abdelhaleem, Ali Ayati, Mohamed Farghali, Ala'a H. Al‐Muhtaseb, Ahmed S. Al‐Fatesh, David W. Rooney   +8 more
wiley   +1 more source

The proof of concept of uninterrupted push‐pull electromagnetic propulsion and energy conversion systems for drones and planet landers

Engineering Reports, Volume 6, Issue 1, January 2024.
We present a proof of concept to demonstrate the capability of a newly invented variable speed push‐pull electromagnetic propulsion system for uninterruptedly generating the reciprocating motion of a magnetic‐piston by a solar battery‐driven polarity changer timing circuit together with a laser‐based timing circuit for redundancy.
Sanal Kumar VR, Amrith Mariappan, U. K. Thianesh, Ajith Sukumaran, Ashish Kumar, V. K. Vijil Lal, Jerin John, Raunak Sharma, Sanjay Singh   +8 more
wiley   +1 more source

Index to NASA Tech Briefs, 1975 [PDF]

, 1976
This index contains abstracts and four indexes--subject, personal author, originating Center, and Tech Brief number--for 1975 Tech ...

core   +1 more source