Numerical Analysis of Dynamic Interaction Between Two Closely Spaced Vertical Axis Wind Turbines

Abstract

To investigate the optimum layouts of small vertical axis wind turbines, a two-dimensional analysis of dynamic fluid body interaction is performed via computational fluid dynamics for a rotor pair in various configurations. The rotational speed of each turbine rotor (diameter: D = 50 mm) varies based on the equation of motion. First, the dependence of rotor performance on the gap distance (gap) between two rotors is investigated. For parallel layouts, counter-down (CD) layouts with blades moving downwind in the gap region yield a higher mean power than counter-up (CU) layouts with blades moving upwind in the gap region. CD layouts with gap/D = 0.5–1.0 yield a maximum average power that is 23% higher than that of an isolated single rotor. Assuming isotropic bidirectional wind speed, co-rotating (CO) layouts with the same rotational direction are superior to the combination of CD and CU layouts regardless of the gap distance. For tandem layouts, the inverse-rotating configuration (IR) shows an earlier wake recovery than the CO configuration. For 16-wind-direction layouts, both the IR and CO configurations indicate similar power distribution at gap/D = 2.0. For the first time, this study demonstrates the phase synchronization of two rotors via numerical simulation.

Dynamic Synchronization Modeling and Simulation of Video Sensing Nodes Based on Internet of Things

“…(i) "Skip": if the user input button is "Skip," the model DSAM transition will be activated immediately, and the library place that is not executing completes the semantics (ii) "Pause" and "Restart": if the user submits a "Pause," the place C p accepts a token and performs a Nop operation at the same time until the next input interaction is "Restart" (iii) "Modify Speed": if the user inputs the "Modify Speed" operation of the library place θ t at time C p , the result is to change the execution speed of various information of IoT video perception From the above analysis, it can be seen that the DSAM model can well realize and complete the dynamic interaction between media and users [17].…”

Eşli Çalışan Düşey Eksenli Türbin Performansının İki Boyutlu Benzetimi

“…Eşli çalışan DERT'lerin iki boyutlu benzetim yöntemiyle incelendiği bir başka çalışmada, dıştan içe doğru zıt yönde dönen türbinlerde, türbin arası mesafenin 0,5 ve 1 çap olduğu durumda türbin performansında %23'e varan yükselişler görüldüğü belirtilmiştir. İki türbinin aynı ve farklı fazda çalıştığı durumun da incelendiği çalışmada, aynı fazda çalışan eşli türbinlerin ara bölgesinin belli periyotlarla çok daraldığına, bunun da Bernoulli prensibi gereği basıncın azalıp, akışın hızlanmasına yol açtığı belirtilmiştir [8].…”