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All Journal EMITTER International Journal of Engineering Technology Prosiding SNAST Journal of Mechanical Engineering, Science, and Innovation
Setyo Nugroho
Politeknik Elektronika Negeri Surabaya
Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : Prosiding SNAST

 1 
PENGARUH MODIFIKASI DOVETAIL-CROWN TIP PADA ROTOR TERHADAP PRESSURE RATIO KOMPRESOR AKSIAL MULTISTAGE Ibnu Samsul Kurniawan; Setyo Nugroho; Prima Dewi Permatasari
PROSIDING SNAST Prosiding SNAST 2018
Publisher : IST AKPRIND Yogyakarta

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Abstract

Compressors are one type of turbomachinery to add energy of fluid and move fluid from one location to another. Axial compressor on gas turbine used to compress fluid to get the required pressure increase. Multiple-stage axial compressor have a high level performance, that is 70-80%. Compressor performance is related with energy utilization, the greater the energy loss, the lower the compressor performance. The biggest energy loss is caused by aerodynamic loss, stall phenomenon and tip clearance. Gap between casing and rotor can cause secondary flow, leakage flow and boundary scrapping. These three streams can cause energy losses and affect the pressure ratio produced by the compressor. One way to get better performance with add dovetail-crown tip modification on the rotor, with the aim of reducing energy loss on the tip clearance. Modification of dovetail-crown tip on the rotor that is, the airfoil profile extended 75% of tip clearance compressor, then given a square gap along the chord with a/b ratio of 1:3. The axial compressors that become the testing system have parameters: 0.5 degree reaction, three stage, stagger angle 24 °, NACA 65- (19) -10 blade profile. Based on the results, the addition of a modified tip blade in the form of a dovetail-crown tip can reduce energy losses by presenting an average reduction in energy losses of 11.9%. The results also show that the use of dovetail-crown tip modification can increase the compressor pressure ratio with an average percentage increase of 0.0219%.
STUDI NUMERIK PENGARUH PENAMBAHAN GUIDE VANES TERHADAP KINERJA CIRCULAR ELBOW Imam Santoso; Setyo Nugroho; Prima Dewi Permatasari
PROSIDING SNAST Prosiding SNAST 2018
Publisher : IST AKPRIND Yogyakarta

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Abstract

The use of curved pipes will cause a pressure drop that is greater than the straight pipe of the same length. This is because there is a large pressure difference between the outer wall and the inner wall, eventually blocking the flow of fluid in the pipe. Pressure drop (pressure drop) of this flow is caused by friction (friction loss), separation (separation) and secondary flow (secondary flow). One method that can reduce pressure on the 900 elbow with the guide vane. The test module is in the form of a circular elbow 900 with a radius ratio (rc / Dh) = 1.2217 without a guide vane and uses a variety of number of guide vane. Numerical research uses computational fluid dynamics (CFD) method using computational software ANSYS FLUENT 14.5 with ReDolds number 9.8x104 ReDh. Fluid in the form of air with an inlet speed is uniform. From the results of this study obtained pressure drop, contour preset coefficient, velocity vector and pathline to determine the fluid flow phenomenon passing through the circular elbow with the addition of one guide vane, two guide vane, three guide vane, and without guide vane as a reference the phenomenon of the addition of guide vanes . The addition of guide vane gives the effect of increasing pressure drop. The biggest increase in pressure drop was the addition of three guide vane with an increase of 45.54% compared to the reference. The magnitude of this pressure drop occurs due to an increase in fluid friction with guide vanes and vortices which block the mainflow in circular elbow.
STUDI EKSPERIMEN PERPINDAHAN PANAS KONVEKSI PAKSA INTERNAL PADA SALURAN BENTUK SILINDER DAN PERSEGI Qurniawan Zen Al Faris; Arrad Ghani Safitra; Setyo Nugroho
PROSIDING SNAST Prosiding SNAST 2018
Publisher : IST AKPRIND Yogyakarta

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Abstract

Forced convection inside a pipe is a case of convection mass transfer for internal flow. Main parameter of internal flow forced convection is a convection coefficient number (h). One of the ways to increasing the convection coefficient number is changing the cross section of the channel. But, there are some other factors that affect the convection coefficient number such as fluid velocity, surroundings temperature, and the number of heat flux. The study was conducted experimentally by making a channel from aluminum with cylinder and square cross section form. With 1.5 m length hydraulic diameter 0.0762 m, which aims to find out the characteristics of internal flow forced convection heat transfer. The channel surface is fully isolated to minimize the value of heat losses caused by the ambient temperature, so that the same thermal energy is obtained along the channel. Heating on the surface of the channel uses an electric heater with a capacity of 223.52 watts. Then the air fluid is channeled through the channel at a speed of 3.6 m / s and 5 m / s using an electric blower regulated by a valve. Testing is carried out in a room where the temperature is conditioned, taking temperature data using a temperature sensor (thermistor) within 25 cm of each sensor mounted on the surface of the channel wall. Data processing uses software engineering equation solver (EES) to improve the analysis of experimental results. From the analysis results obtained, the square channel convection coefficient number is greater than the cylinder form channel of 22,84; 22,77; 22,72; 22,7; 22,69; 22,72 W / m2K.
STUDI EKSPERIMEN VORTEX INDUCED VIBRATION ENERGY CONVERTER (VIVEC) PADA REYNOLDS NUMBER 50.000 Karina Putri Nurma Gumpita; Setyo Nugroho; Raden Sanggar Dewanto
PROSIDING SNAST Prosiding SNAST 2018
Publisher : IST AKPRIND Yogyakarta

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Abstract

Hydro energy is one of the largest sources and capale generating 16% of electricity in the world. In Indonesia, In Indonesia, the potential of hydro energy reaches 75 GW. However, currently only about 9% of it that has been utilized properly. Vortex-Induced Vibration Energy Converter (VIVEC) is one technology that utilizes hydro energy. VIVEC converts the translational motion up and down from a cylinder attached to a slider into electrical energy. The oscillation of the cylinder is caused by the release of the vortex that forms around the cylinder when it hit by water at a certain speed. VIVEC has big potential to applied in Indonesia. This is because most of river in Indonesia has stable debit. One of them is Sungai Citarum. Sungai Citarum is at Desa Dayeuh Kolot, Kabupaten Bandung, Jawa Barat has max debit 397,4 m3/sand min debit 204,1 m3/s. One of the parameters affect the performance of VIVEC is Reynolds Number. This research focused on Reynolds Number around 50.000 with physical test using towing tank. The parameters as same as parameters at Sungai Citarum, which is velocity 0,4 m/s and the diameter of cylinder is 0,1257 cm. Based on this research, maximum amplitudo is 4,43 cm, frequency of oscillating is 0,67, and the efficiency of VIVEC is 13,03%.
Co-Authors Achmad Arifudin Hidayatulloh Arrad Ghani Safitra Ary Bachtiar Khrisna Putra Eky Novianarenti Ibnu Samsul Kurniawan Imam Santoso Karina Putri Nurma Gumpita Mochammad Arief Julianto Mohammad Basuki Rahmat Prima Dewi Permatasari Priyambodo Nur Ardi Nugroho Qurniawan Zen Al Faris Raden Sanggar Dewanto Rini Indarti Teguh Hady Aribowo