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All Journal Jurnal Teknik Mesin Jurnal Teknik ITS IPTEK The Journal for Technology and Science Journal of Energy, Mechanical, Material and Manufacturing Engineering Mesin Otopro International Journal of Mechanical Engineering Technologies and Applications (MECHTA) JMES: The International Journal of Mechanical Engineering and Sciences Sewagati
Herman Sasongko
Mechanical Engineering Department, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
Aerospace Engineering Arts Humanities Automotive Engineering Computer Science & IT Control & Systems Engineering Education Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Other

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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.
NUMERICAL INVESTIGATION OF REAR WINDSHIELD ANGLE AND REYNOLDS NUMBER EFFECTS ON THE AERODYNAMIC PERFORMANCE OF A SALOON CAR Dwi Tarti; Ika Nurjannah; Herman Sasongko
Otopro Vol 21 No 2 May 2026
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v21n2.p85-94

Abstract

This study examined how rear windshield angle and body geometry affect the aerodynamic behavior of a saloon car model using numerical simulations. Rear windshield angles of 45°, 60°, 75°, and 90° were considered for two configurations—sharp and rounded rear corners— whereas the front windshield angle was kept constant at 30% to allow a consistent comparison. Simulations were conducted at two Reynolds numbers, 6.5×10⁶ and 11.8×10⁶, corresponding to inlet velocities of 22.2m/s and 40m/s. The simulations were performed using ANSYS Fluent 2024, focusing on the flow behavior along the upper and lower surfaces, as well as the resulting drag and lift characteristics. The results showed that increasing the rear windshield angle generally led to higher drag, mainly due to the expansion of the wake region behind the vehicle. Models with rounded corners consistently performed better than sharp-edged ones, producing lower drag and more stable flow behavior. The lowest drag coefficient (CD=0.556) was found for the rounded configuration at a 45° rear windshield angle, whereas the highest value (CD=0.8147) appeared in the sharp configuration at 90°. From the flow visualization, it can be seen that the sharp edges create stronger adverse pressure gradients, which trigger earlier separation and lead to a larger wake. In contrast, rounded corners helped the flow to recover more smoothly and delayed separation. Overall, these findings emphasize the role of the rear windshield angle and body geometry in improving aerodynamic efficiency and minimizing energy losses.
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
Numerical Study of Damper Plate and Nozzle Effect on Vortex Turbine Basin for Increasing Flow Kinetic Energy Entering Turbine Rotor Herman Sasongko; Wildan Alfa Rahman
JMES: The International Journal of Mechanical Engineering and Sciences Vol 7 No 1 (2023)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v7i1.16270

Abstract

The Gravitational Water Vortex Power Plant (GWVPP) is a small-scale hydroelectric power generator that makes use of the energy generated from a vortex flow to turn turbine blades and generate electricity. In this research study, the focus was on the numerical analysis of the basin design of the GWVPP, which is divided into three sections: vortex generator section, transformer section, and turbine section. To support the transformation process from tangential vortex speed to axial vortex speed in the transformer section, a damper plate was installed to direct the rotating flow. The effect of the nozzle in accelerating the flow for optimizing the basin design was also studied to reduce blockage caused by the transformation process. The numerical results indicate that designs with nozzle have lower velocity outputs due to blockage from the rotating flow. At flow rate of 0.1 m3/s, the presence of damper plate reduces the maximum flow rotation, but at flow rate of 0.2 m3/s, it prevents flow leakage on the surface. The basin design without damper plate and nozzle is the optimal variation for flow rates of 0.1 m3/s, while the design with damper plate but without nozzle is optimal for flow rates of 0.2 m3/s.
Experimental and Numerical Study of Two Dimensional Flow of Bubble Separation over the Leading of Thickness Plate Herman Sasongko; Abdul Haris Irfani
JMES: The International Journal of Mechanical Engineering and Sciences Vol 4 No 2 (2020)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v4i2.7870

Abstract

Co-Authors Abdul Haris Irfani Abdul Haris Irfani Ahmad Ali Wafa Arino Anzip Arwanda Wahyu Eko Sadewo Bambang Iskandariawan Bambang Pramujati Bambang Sudarmanta Bangga, Galih Charminuel Sihombing Dedy Zulhidayat Noor Djatmiko Ichsani Dwi Tarti Galih S.T.A. Bangga Gunawan Nugroho Heru Mirmanto Ika Nurjannah Ika Nurjannah, Ika IKAP Utama Indra Sidharta Is Bunyamin Khoiri Rozi Mohammad Adenan Mohammad Khoirul Effendi Noor, Dedy Zulhidayat Nugrahani, Elita Fidiya Nur Ikhwan Nur Ikhwan Nur Yuniarto Pasaribu, Johan Nicholas Paulus Indiyono Prabowoa Prabowo Sampurno Sampurno Sarwono Shabrina, Dhia Fairuz Suhardjono Suhardjono Suhardjono Sutardi Sutardi Triyogi Yuwono Ulul Azmi Wawan Aries Widodo Wildan Alfa Rahman Wildan Alfa Rahman Yudiansyah Harahap Yusuf Kaelani