Results 41 to 50 of about 143,374 (309)

Detonation Waves on Enhancing Aerospace Propulsion Systems Performances: A Review

Aerospace
Detonation-based combustion has re-emerged as a promising pathway for enhancing the efficiency and compactness of future aerospace propulsion systems, motivated by the intrinsic pressure-gain characteristics of detonative heat release.
Bogdan-Cătălin Năvligu, Grigore Cican , Răzvan Edmond Nicoară, Theodor-Mihnea Sîrbu   +3 more
doaj   +1 more source

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

Advanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal, Tae‐Hyeok Kang, Pyuck‐Pa Choi, Subin Lee, Christoph Kirchlechner   +4 more
wiley   +1 more source

An Assessment of Diesel Engine Performance Using a Dual-Fuel Diesel—Ammonia Injection

Engineering Proceedings
In the context of promoting strategies to mitigate the global warming effect resulting from greenhouse gas emissions produced by human activities, ammonia stands out as an important player in the decarbonization of various sectors, including ...
Lucian Miron, Vlad-Alexandru Ungureanu, Radu Ionescu, Radu Chiriac   +3 more
doaj   +1 more source

CONTRIBUTIONS TO ROBOTIC GAS TUNGSTEN ARC WELDING OF A HEAT EXCHANGER ASSEMBLY USED AS A PART OF AN ELECTRICALLY DRIVEN CENTRIFUGAL AIR COMPRESSOR CCAE 15-300

Nonconventional Technologies Review, 2021
In order to weld the copper pipe components of a heat exchanger assembly for a centrifugal air compressor CCAE 15-300, experiments were performed on a test piece.
Andrei Mitru, Mircea Mitru, Cora Cotescu, Augustin Semenescu   +3 more
doaj  

Fuel property effects in stirred combustors [PDF]

, 1980
Soot formation in strongly backmixed combustion was investigated using the jet-stirred combustor (JSC). This device provided a combustion volume in which temperature and combustion were uniform.

core   +1 more source

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, EarlyView.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

Experimental Identification of a New Secondary Wave Pattern in Transonic Cascades with Porous Walls

Aerospace
Turbomachinery shock wave patterns occur as a natural result of operating at off-design points and are accountable for some of the loss in performance. In some cases, shock wave–boundary layer (SW-BLIs) interactions may even lead to map restrictions. The
Valeriu Drăgan, Oana Dumitrescu, Mihnea Gall, Emilia Georgiana Prisăcariu, Bogdan Gherman   +4 more
doaj   +1 more source

Wind turbines and invisible technology: unarticulated reasons for local opposition to wind energy [PDF]

, 2013
Local opposition to wind turbines stems from concerns about environmental and economic damage, as well as conflicts between rural and urban residents.
Hirsh, Robert F, Sovacool, Benjamin K
core   +1 more source

Additively Manufactured Porous Ceramics as Tunable Dielectrics for Passive Temperature Sensing

Advanced Materials Technologies, EarlyView.
Porous ceramic lattices, 3D‐printed from a multicomponent oxide ink, are integrated with LC resonators for passive wireless temperature sensing. By tuning porosity, the dielectric properties and RF response are engineered to produce distinct resonant frequency shifts with temperature. The results establish a structure‐driven approach to customizing the
Sogol Heidarishahrivar, Aminul Islam, Chang Woo Gal, Insup Kim, Yeong‐Jin Choi, Woo Soo Kim   +5 more
wiley   +1 more source

CFD and Experimental Comparison for Micro-Pump Performance in Space Applications: A Case Study

Applied Sciences
This paper presents a case study comparing CFD predictions with experimental measurements for micropumps, with the goal of evaluating the accuracy and limitations of CFD methods in complex microscale geometries.
Oana Dumitrescu, Cristian Dobromirescu, Valeriu Dragan, Ionut Sebastian Vintila, Radu Mihalache   +4 more
doaj   +1 more source