Уважаемые коллеги, доброго времени суток! Представляем вам Journal of King Saud University, Engineering Sciences - научное издание из Саудовской Аравии. Журнал имеет второй квартиль, издается в King Saud University, находится в открытом доступе, его SJR за 2020 г. равен 0,728, электронный ISSN - 1018-3639, предметные области - Топливные технологии, Процессы потока и переноса жидкости, Компьютерные сети и коммуникации, Возобновляемые источники энергии, устойчивое развитие и окружающая среда, Промышленное и производственное машиностроение, Материаловедение. Вот так выглядит обложка:
Редактором является Анис Факееха, контактные данные - anishf@ksu.edu.sa.
Это ежеквартальный рецензируемый журнал, публикуемый Elsevier BV от имени Университета короля Сауда. JKSUES посвящен широкому кругу областей инженерных наук, приветствует статьи междисциплинарного характера.
Адрес издания - https://www.journals.elsevier.com/journal-of-king-saud-university-engineering-sciences
Пример статьи, название - Centrifugal Controller of Rotation Frequency for Vertical Axis Wind Turbine. Заголовок (Abstract) - The market for small Vertical Axis Wind Turbines (VAWT) continues to grow rapidly, filling up especially the low wind potential locations. Since the Saudi Government has announced to install 9 GW of wind power by 2032, this ambitious plan could be at least partially improved by the small wind turbines, taking into account the low annual mean wind speed on the most Kingdom of Saudi Arabia territory.
However, the safety and durability of most commercially available VAWT turbines has not been adequately addressed with respect to turbine over speed in high wind speed conditions. The presented research gives a methodology for calculating a cost effective dynamic braking controller, based on a centrifugal mechanical activation spring-load mechanism with pendulum. The analysis is focused on a small two-tier 3 kW Darrieus VAWT, where a mechanically activated friction brake is deployed as the turbine rotational speed approaches a red line. The proposed method makes a small turbine absolutely safe on any available wind speed and/or during accidental electric load switch off. The analysis was made for typically high continental wind speed 25 m/s.
The paper presents the calculation model in VisSim software. Controller parameters were developed as the result of research conducted on functional turbine of the specific size in the model. The experiments covered two different cases: with relatively low spring stiffness coefficient (400 N/m), showing the periodical oscillations of controller pendulum on the cut-out speed. And high spring stiffness coefficient (4000 N/m), which the VAWT rotor can be surely braked at.
The paper is intended to provide the mathematical basis for scientific analysis, as well as providing practical implementation information to engineers building similar turbines, including Savonius, Darrieus, H-Darrieus, Helix shape, V-type and any other types of rotating rotors. The estimated Capacity utilization factor (CUF) of any VAWT, when using the proposed centrifugal mechanical controller, can be increased twice to 82% for on-land small VAWT. Keywords: safety; mathematical model; vertical axis wind turbine; centrifugal mechanical brake