Results 31 to 40 of about 5,519 (211)

Supercharged topping rocket propellant feed system [PDF]

, 1979
A rocket propellant feed system utilizing a bleed turbopump to supercharge a topping turbopump is presented. The bleed turbopump is of a low pressure type to meet the cavitation requirements imposed by the propellant storage tanks.
Ginsburg, A., Hartmann, M. J., Stewart, W. L.   +2 more
core   +1 more source

Experimental Evaluation of Electric Powertrain System for Unmanned Aerial Vehicles

Engineering Reports, Volume 8, Issue 1, January 2026.
Electric Powertrain Performance Metrics and Selection Workflow for UAVs. ABSTRACT With the growing use of unmanned aerial vehicles (UAVs) in both civil and military applications, optimizing electric powertrain systems is essential to enhance endurance, efficiency (η$$ \eta $$), and mission adaptability.
Srikanth Goli, Dilek Funda Kurtuluş, Imil Hamda Imran, Taiba Kouser, Abdulrahman Aliyu, Luai M. Alhems, Azhar M. Memon   +6 more
wiley   +1 more source

Hydraulic Design of an Ultracompact Liquid Methane–Liquid Oxygen Turbopump for a Mid-Scale Thruster for Upper Stage Application

Inventions
As space missions proliferate and the payload requirements increase, the environmental impact of thrusters can no longer be considered negligible. Therefore, less impactful fuels such as methane are starting to be considered for launchers.
Alexandru-Claudiu Cancescu, Daniel-Eugeniu Crunteanu, Anna-Maria Theodora Andreescu, Simona-Nicoleta Danescu, Valeriu Dragan   +4 more
doaj   +1 more source

A Comprehensive Review of Additive Manufacturing for Space Applications: Materials, Advances, Challenges, and Future Directions

Advanced Engineering Materials, Volume 27, Issue 22, November 2025.
Additive manufacturing (AM) transforms space hardware by enabling lightweight, high‐performance, and on‐demand production. This review outlines AM processes—powder bed fusion (PBF), directed energy deposition (DED), binder jetting (BJ), sheet lamination (SL), and material extrusion (ME)—applied to propulsion, satellite structures, and thermal devices ...
Stelios K. Georgantzinos, Eleni Papadopoulou, Grigorios Kostopoulos, Stefanos Voulgaris, Alexandra Tseni, Panteleimon Bakalis, Maria Gkara, Chara C. Mitropoulou, Nikos D. Lagaros   +8 more
wiley   +1 more source

Comprehensive Approach for Identification of Nonlinear Stiffness Characteristics of Bearing Supports for the Oxidizer Turbopump of the Liquid Rocket Engine

Журнал інженерних наук, 2018
This article dials with the refinement of the mathematical and computational models of the oxidizer turbopump rotor considering bearing gaps, axial preloading, compliance of the housing parts and the effect of rotation.
Pavlenko I., Demyanenko M., Edl M., Simonovskiy V., Pitel’ J., Pavlenko V., Verbovyi A.   +6 more
doaj   +1 more source

Effect of pH on the Electrochemical Reduction of Nitrate on Metallic Copper

ChemCatChem, Volume 17, Issue 21, November 10, 2025.
The electrochemical reduction of nitrate on Cu was investigated between pH 4.4–9.3 using on line DEMS and in situ FTIR. We show that electrolyte pH governs the stabilization and conversion of key intermediates such as NO, N2O, and N2H4, and alters local interfacial conditions.
Gabriel F. Costa, Manuel E. G. Winkler, Maria R. Pinto, Fabio H. B. Lima, Raphael Nagao   +4 more
wiley   +1 more source

Design criteria monograph on turbopump systems [PDF]

, 1975
Turbopump assembly for modern liquid propellant rocket engine is complete system in itself. It consists of many components, some of which are themselves subsystems.

core   +1 more source

A Visualization Verification Method for Startup Risk of Substation Equipment Based on Multidimensional Graph Models

Engineering Reports, Volume 7, Issue 11, November 2025.
Based on a multi‐dimensional diagram model, a technique for visual verification of the risk of starting substation equipment is studied. This method can effectively and precisely verify the possible risks during the substation equipment startup and enhance the power system's operational safety.
Lifan Mao, Huang Chen, Yongqi He, Chuanpu Zhu, Chao Chen   +4 more
wiley   +1 more source

Silver (I) and Silver (II) Oxide Films for Biomedical Implants: Synthesis, Stability, Ion Release, and Antibacterial Efficacy

Journal of Biomedical Materials Research Part A, Volume 113, Issue 11, November 2025.
ABSTRACT Coatings of silver compounds with higher dissolution rates than metallic silver offer a promising approach for delivering Ag+ ions to prevent medical implant device‐associated infections. In this study, we investigate the synthesis and characterization of single‐phase, silver (I) oxide (Ag2O) and silver (II) oxide (AgO) for potential ...
Maxwell Akantibila, Hailey Maurer, Matthew Urban, Steven DiSpirito, John Torres, Arwa Muhamed, Janiyah Harris, Alex Bharath, Roxanne Green, Theodore H. Scabarozi, Gregory A. Caputo, Valerie J. Carabetta, Jeffrey D. Hettinger   +12 more
wiley   +1 more source

Winglet Geometries Applied to Rotor Blades of a Hydraulic Axial Turbine Used as a Turbopump: A Parametric Analysis

Energies
Turbines are rotating machines that generate power by the expansion of a fluid; due to their characteristics, these turbomachines are widely applied in aerospace propulsion systems.
Daniel da Silva Tonon, Jesuino Takachi Tomita, Ezio Castejon Garcia, Cleverson Bringhenti, Luiz Eduardo Nunes de Almeida, Jayanta Kapat, Ladislav Vesely   +6 more
doaj   +1 more source