Results 61 to 70 of about 190,559 (293)
Low-Order Modeling and High-Fidelity Simulations for the Prediction of Combustion Instabilities in Liquid Rocket Engines and Gas Turbines [PDF]
arXiv, 2021 Combustion instabilities are a major concern in the design of Liquid Rocket Engines (LREs) and gas turbines. During this PhD work, several directions were explored to understand and mitigate their effects. First, more efficient and robust numerical methods for their prediction in complex combustors were designed.
arxiv
Damping of liquid sloshing by foams [PDF]
, 2014 When a container is set in motion, the free surface of the liquid starts to oscillate or slosh. Such effects can be observed when a glass of water is handled carelessly and the fluid sloshes or even spills over the rims of the container. However, beer does not slosh as readily as water, which suggests that foam could be used to damp sloshing.
arxiv +1 more source
Forecasting Thermoacoustic Instabilities in Liquid Propellant Rocket Engines Using Multimodal Bayesian Deep Learning [PDF]
arXiv, 2021 The 100 MW cryogenic liquid oxygen/hydrogen multi-injector combustor BKD operated by the DLR Institute of Space Propulsion is a research platform that allows the study of thermoacoustic instabilities under realistic conditions, representative of small upper stage rocket engines.
arxiv
Hypergolic droplet‒film interaction dynamics at high temperatures
Droplet, EarlyView.The whole reaction process can be distinctly identified as three stages based on the corona size and the temperature temporal evolution. In the coalescence regime, T* maintains quasi‐stationary values during initial contact, corresponding to hydrodynamic coalescence process. Consequently, the first stage is defined as the inertia‐dominant stage. In the
Yuxin Song, Zuohua Huang, Chenglong Tang
wiley +1 more source
A design tool for liquid rocket engine injectors [PDF]
36th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 2000 A practical design tool which emphasizes the analysis of flowfields near the injector face of liquid rocket engines has been developed and used to simulate preliminary configurations of NASA's Fastrac and vortex engines. This computational design tool is sufficiently detailed to predict the interactive effects of injector element impingement angles and
H. Trinh +3 more
openaire +2 more sources
Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2020 The algorithm of the turn of the spacecraft from an initial arbitrary angular position at an arbitrary angular rate to a solar-oriented attitude is investigated.
M. G. Shipov +2 more
doaj +1 more source
Model-Based Robust Transient Control of Reusable Liquid-Propellant Rocket Engines
IEEE Transactions on Aerospace and Electronic Systems, 2020 Reusable liquid-propellant rocket engines (LPREs) imply more demanding robustness requirements than expendable ones due to their extended capabilities. Therefore, the goal of this article was to develop a control loop adapted to all the operating phases ...
Sergio Pérez-Roca +6 more
semanticscholar +1 more source
Recent Advances in Non‐Aqueous Liquid Electrolytes for High‐Voltage Sodium‐Ion Batteries
EcoEnergy, EarlyView.Increasing charging voltage is an effective way to realize sodium‐ion batteries with low cost and high energy density. This review systematically summarizes the development of electrolytes for high‐voltage sodium‐ion batteries in recent years, aiming to promote the breakthrough and application of high energy density sodium‐ion batteries.
Jing Ning +9 more
wiley +1 more source
, 2017 Upper stage and in-space liquid rocket engines are optimized for performance through the use of high area ratio nozzles to fully expand combustion gases to low exit pressures, increasing exhaust velocities.
P. Gradl, P. Valentine
semanticscholar +1 more source
Global Challenges, EarlyView.This graphical abstract illustrates sustainable hydrogen production methods integrating solar, wind, and biomass sources. It highlights electrolysis as the central green hydrogen pathway and contrasts renewable and industrial uses. Color‐coded hydrogen types depict the diversity in production technologies, emphasizing clean energy transitions and ...
Sajid Ali Ansari +7 more
wiley +1 more source