Results 61 to 70 of about 14,137 (299)

Fluid Dynamics and Infrared Stealth of Marine IRS Devices: A Review

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Infrared suppression (IRS) devices for naval ships play a crucial role in reducing the infrared radiation signature of high‐temperature exhaust, thereby enhancing the survivability of ships against infrared‐guided weapons. This paper provides a comprehensive review of recent advancements in the design and optimization of IRS devices.
Yitao Zou, Zhenrong Liu, Xin Qiao, Yingying Jiang, Hong Shi, Yanlong Jiang   +5 more
wiley   +1 more source

Numerical analysis of the shock train in conical nozzles with straight-cut throats [PDF]

FME Transactions
The overexpanded flow regime in supersonic rocket engine nozzles presents different shock wave structures due to the geometrical configurations of the internal walls.
Tolentino San L., Mírez Jorge, Caraballo Simón A.   +2 more
doaj   +1 more source

Far Field Deposition Of Scoured Regolith Resulting From Lunar Landings [PDF]

, 2012
As a lunar lander approaches a dusty surface, the plume from the descent engine impinges on the ground, entraining loose regolith into a high velocity dust spray.
Goldstein, D. B., Morris, A. B., Trafton, L. M., Varghese, P. L.   +3 more
core   +1 more source

Synergistic effects of annealing heat treatment and lignocellulose fiber incorporation on the thermal, mechanical, and water absorption properties of poly(lactic acid)‐based biocomposites

Polymer Composites, EarlyView.
The effect of molecular structure on the moisture absorption of PLA/cellulose biocomposites. Abstract This study investigates the effect of annealing heat treatment on polymer composites composed entirely of biodegradable components. Poly(lactic acid) (PLA) was used as the matrix material paired with three different types of commercial lignocellulose ...
Sándor Kálmán Jakab, Virág Luca Bódi, László Lendvai   +2 more
wiley   +1 more source

Computational study on flow through truncated conical plug nozzle with base bleed

Propulsion and Power Research, 2019
Conical plug nozzle and truncated conical plug nozzle are advanced rocket nozzles suitable for use as altitude compensating nozzles. In this study flow through the conical plug and truncated conical plug nozzles are numerically simulated to first ...
Prasanth P. Nair, Abhilash Suryan, Heuy Dong Kim   +2 more
doaj  

A Two-Dimensional Analysis of the Flowfield and Performances of Linear Aerospikes During Differential Throttling

Aerospace
The performances of two linear aerospike nozzles, generated by truncating the same plug contour at 40% and 20% of its ideal length, are investigated numerically within a two-dimensional approximation and compared with each other. The nozzle geometry is a
Jehangir Hassan, Gaetano Maria Di Cicca, Michele Ferlauto, Roberto Marsilio, Emanuele Resta   +4 more
doaj   +1 more source

Advances in ultra-high temperature ceramics, composites, and coatings

Journal of Advanced Ceramics, 2021
Ultra-high temperature ceramics (UHTCs) are generally referred to the carbides, nitrides, and borides of the transition metals, with the Group IVB compounds (Zr & Hf) and TaC as the main focus.
Dewei Ni, Yuan Cheng, Jiaping Zhang, Ji-Xuan Liu, Ji Zou, Bowen Chen, Haoyang Wu, Hejun Li, Shaoming Dong, Jiecai Han, Xinghong Zhang, Qiangang Fu, Guo-Jun Zhang   +12 more
doaj   +1 more source

Simultaneous Sizing of a Rocket Family with Embedded Trajectory Optimization [PDF]

arXiv, 2023
A sizing procedure for a rocket family capable of fulfilling multiple missions considering the commonality is presented. The procedure aims to take full advantage of sharing a common part across multiple rockets whose payload capability differs entirely, ultimately leading to cost savings in designing a rocket family.
arxiv  

A Critical Review of Limitations and Challenges in Advancement of HNF as a Green Oxidizer for Composite Solid Propellant Formulations

Propellants, Explosives, Pyrotechnics, EarlyView.
ABSTRACT Hydrazinium nitroformate (HNF) is a chlorine‐free, high‐energy oxidizer with promising applications in green propulsion systems. This review examines the thermal decomposition, combustion kinetics, flame structure, and behavior of HNF, while critically evaluating the current body of literature.
Lakshay Bansal, Prakhar Jindal, Vineet Kumar Rathi   +2 more
wiley   +1 more source

Shock Wave and Aeroelastic Coupling in Overexpanded Nozzle

Aerospace
The growing demand for increasing the engine power of a liquid rocket is driving the development of high-power De-Laval nozzles, which is primarily achieved by increasing the expansion ratio.
Haifeng Hu, Xinni Gao, Yushan Gao, Jianwen Yang   +3 more
doaj   +1 more source