The Tesla valve – A fluidic diode

2019 ◽  
Vol 57 (3) ◽  
pp. 201-201
Author(s):  
Doug Stith
Keyword(s):  
2020 ◽  
Vol 10 (03) ◽  
pp. 270-278
Author(s):  
Keito Matsumoto ◽  
Manabu Takao ◽  
Shinya Okuhara ◽  
Miah Md. Ashraful Alam ◽  
Yoichi Kinoue

Author(s):  
Gerda Buchberger ◽  
Alexander Kogler ◽  
Agnes Weth ◽  
Richard Baumgartner ◽  
Philipp Comanns ◽  
...  

2018 ◽  
Vol 283 ◽  
pp. 375-385 ◽  
Author(s):  
Gerda Buchberger ◽  
Richard Baumgartner ◽  
Alexander Kogler ◽  
Thomas Fritz ◽  
Siegfried Bauer ◽  
...  

2016 ◽  
Vol 93 (3) ◽  
Author(s):  
Jingwen Mo ◽  
Long Li ◽  
Jun Wang ◽  
Zhigang Li
Keyword(s):  

Author(s):  
Hideki Sato ◽  
Manabu Takao ◽  
Shinya Okuhura ◽  
Miah Md. Ahsraful Alam ◽  
Toshiaki Setoguchi

As an air turbine equipped with oscillating water column (OWC) based wave energy plant, a rectification-valve system has been invented to date. However, this turbine system has problems with the durability of the valves and the complex mechanism. Moreover, it has a major fault in that the valves must be large for high output. Therefore, a twin unidirectional impulse turbine topology has been suggested in previous studies in order to use conventional unidirectional turbines without valves [1, 2]. The topology is composed of two unidirectional impulse turbines. However, the past study indicated that the mean efficiency of the topology was shown to be low, when the performance prediction of the topology in oscillating airflow was carried out by means of quasi-steady analysis [2]. Further, the cause of the low efficiency is because part of the air flow gets through the unidirectional impulse turbine in the direction of low efficiency [2]. In this study, a fluidic diode [3, 4] is adopted in order to suppress the air flow rate into the inefficient turbine in a twin unidirectional impulse turbine topology for wave energy plant, and the effect of the fluidic diodes on the performance of twin unidirectional impulse turbine topology is investigated by a wind tunnel test and computational fluid dynamics (CFD). Further, its usefulness is discussed from a view point of the turbine mean efficiency under unsteady flow condition.


2021 ◽  
Author(s):  
Zijie Niu ◽  
XU Shengming ◽  
JIANG jiangang ◽  
ZHANG Jun

Abstract An apple pluck port based on negative pressure suction force can realize contactless apple plucking and also reduce possible damage to the apple. Accordingly, in this study, a strength type pneumatic pluck port was designed on the basis of a Tesla valve. First, a low air pressure block for mechanization of the Tesla valve structure at the intersection between the main and curved air passageway was theoretically modelled and analyzed. Then, the air pressure and the flow speed distribution were analyzed for three different types of structure parameters under various distances of the Tesla pluck port from the apple; on the basis of a fluent simulation, the maximum pressure difference at both sides of the apple was also simulated. Finally, the structure parameters under an optimal negative pressure field according to the simulation analysis were proposed, and a manufactured experimental test was conducted to compare the results with the simulation. The simulation and experimental data prove that when the included angle between the main and curved air passageway of the Tesla pluck port is lower than 45°, the low air pressure block at the intersection between the main and curved air passageway of the Tesla valve affects the flow of the pluck port and extends the length of the low air pressure block. The Tesla pluck port guarantees a flow in the pipe when the pipe port diameter is 10–15 mm larger than the apple diameter, ensuring the negative strengthening effect of the Tesla pluck port. The experiment proves that the Tesla pluck port designed in this study exhibits a better negative pressure strengthening effect than that achieved via previously existing methods, which can strengthen the plucking effect.


Sign in / Sign up

Export Citation Format

Share Document