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NUMERICAL APPROACH OF THE BLADE SHAPE AND NUMBER ON THE PERFORMANCE OF MULTIPLE BLADE CLOSED TYPE IMPULSE WIND TURBINE Sasongko, Herman; Mirmanto, Heru; Bangga, Galih; Nugrahani, Elita Fidiya; Pasaribu, Johan Nicholas
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 2 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.02.11

Abstract

An impulse turbine uses drag force on its blades to produce torque on its rotor. As fluid flows over the blades, pressure changes occur at the nozzle, which increases the fluid's velocity and reduces the static pressure at the nozzle outlet. The high-momentum fluid then impinges on the rotor blades, generating frictional force and resulting in torque production. To study the impact of blade shape and number on the turbine's performance, simulations were conducted. The results indicate that blades with an angle of 0° and 180° are optimal for creating high-pressure vortices on the concave surface of the blade. Addition-ally, more blades always result in higher torque and power out-put by increasing the active area of the blades. However, in the case of blades with an angle of 0° and 180°, 8 blades produced more torque than 12 blades with an angle of 0° and 90°. There-fore, blades with an angle of 0° and 180° are highly effective at generating drag force and producing torque.
NUMERICAL APPROACH OF THE BLADE SHAPE AND NUMBER ON THE PERFORMANCE OF MULTIPLE BLADE CLOSED TYPE IMPULSE WIND TURBINE Sasongko, Herman; Mirmanto, Heru; Bangga, Galih; Nugrahani, Elita Fidiya; Pasaribu, Johan Nicholas
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 2 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.02.11

Abstract

An impulse turbine uses drag force on its blades to produce torque on its rotor. As fluid flows over the blades, pressure changes occur at the nozzle, which increases the fluid's velocity and reduces the static pressure at the nozzle outlet. The high-momentum fluid then impinges on the rotor blades, generating frictional force and resulting in torque production. To study the impact of blade shape and number on the turbine's performance, simulations were conducted. The results indicate that blades with an angle of 0° and 180° are optimal for creating high-pressure vortices on the concave surface of the blade. Addition-ally, more blades always result in higher torque and power out-put by increasing the active area of the blades. However, in the case of blades with an angle of 0° and 180°, 8 blades produced more torque than 12 blades with an angle of 0° and 90°. There-fore, blades with an angle of 0° and 180° are highly effective at generating drag force and producing torque.
Influence of Front and Rear Wings on Aerodynamic Forces in a Student Formula Car Dedy Zulhidayat Noor; Heru Mirmanto; Arino Anzip; Herman Sasongko
JMES: The International Journal of Mechanical Engineering and Sciences Vol 8 No 2 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v8i2.6283

Abstract

Aerodynamic forces affect the stability of a car when moving, especially when turning. This study conducted a CFD analysis of the influence of wings on the student formula car when turning. The addition of front and rear wings to the formula car increases drag, downforce, and side forces. Except for an airplane that is landing, large drag forces are always avoided, as well as side forces that can interfere with vehicle stability. Interestingly, in contrast to drag and downforce, the coefficient of side forces tends to decrease as cornering speed increases. The increase in downforce or negative lift in this formula car is more dominant and significant than that in the others, and it is very beneficial in increasing wheel grip and traction on the car’s stability when turning
Implementation of Air Sweep to Prevent Blockages on The Salt Crystallization Process Heru Mirmanto; Arino Anzip; Dedy Zulhidayat; Joko Sarsetiyanto
IPTEK The Journal of Engineering Vol. 10 No. 1 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v10i1.a19197

Abstract

In the process of crystallization salt, blockages often occur due to the large amount of salt that sticks to the wall’s hopper of the crusher machine. Seeing this condition, a Salt Cleaning Tool was designed using the air sweep method. In the first step of the design, a survey was carried out to find out how thick and the area of salt that sticks over a certain period. Furthermore, experiments were carried out to determine the position of the nozzle and the air pressure needed to knock out the salt attached to the hopper. The control system uses Arduino hardware as a micro controller tool. The experimental results require that the spray direction is tangential to the hopper surface, so the nozzle on the market needs to be modified. Likewise, an air pressure of 6 bar .is required and a burst time period of every 3 seconds with a nozzle opening time of 250 milliseconds with the condition that three solenoids are open together. Modification of the nozzle The control system uses Arduino hardware as a micro controller tool. The implementation of the air sweep as a salt cleaning tool has been successful, this is evidenced by operation of the crusher machine without problems.