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"Siklon burner merupakan alat yang digunakan untuk mengubah bahan bakar padat menjadi gas yang kemudian energinya dimanfaatkan untuk berbagai tujuan, seperti pembangkitan listrik, boiler, dan sebagainya. Sehubungan semua katup siklon burner harus selalu tertutup selama pengujian untuk menjamin kinerja burner yang maksimal, pengamatan fenomena turbulensi dalam ruang bakar tidak dimungkinkan. Oleh karena itu, Computatuonal Fluid Dynamics digunakan untuk menyelesaikan permasalahan tersebut. Hasil simulasi menunjukkan bahwa nilai Energi Kinetik Turbulensi dan Kecepatan secara keseluruhan cenderung mengalami penurunan seiring dengan jarak yang ditempuh setelah memasuki ruang bakar. Hasil Validasi kecepatan pada bagian outlet menunjukkan bahwa kecepatan hasil simulasi dan pengukuran tidak jauh berbeda dan saling berdekatan.

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Cyclone Burner is a burner used in the purpose of converting solid fuel into gas whose energy is used for various applications such as power generation, boiler, et cetera. Direct observation of turbulence phenomenon is not possible since the combustion chamber must always be closed to ensure possible maximum performance achieved by the burner. Therefore, Computational Fluid Dynamics is used to solve those problems. The simulation results show that both Turbulent Kinetic Energy and Velocity tend to decrease in value by distance travelled by the flow upon entering the combustion chamber. Velocity Validation results show that both velocity curve and velocity point measured during experiment are in good agreement that their marginal results are not greatly different."

"Untuk meningkatkan performa dan efisiensi mikro gas turbin proto X1, telah dilakukan analisa tentang adanya presure drop pada elbow saluran masuk ruang bakar. Penelitian ini dilakukan untuk mengamati fenomena aliran fluida dan distribusi tekanan yang terjadi pada elbow 900 menggunakan SolidWorks 2011. Penelitian dilakukan dengan membandingkan besarnya pressure drop akibat penambahan guide vanes pada elbow 90°. Hasil penelitian menunjukkan pressure drop berkurang dengan adanya penambahan guide vanes pada elbow bagian bawah sebesar 0,54 % pada kecepatan aliran 5,73 m/s, 10,42% pada kecepatan aliran 6,78 m/s, dan sebesar 11,29% pada kecepatan aliran 7,72 m/s. Dari hasil penelitian penulis menyarankan agar dilakukan analisa terhadap pressure drop yang terjadi pada ruang bakar sehingga performa dan efisiensi turbin dapat ditingkatkan lagi.

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To improve performance and efficiency of micro gas turbine proto X1, has conducted an analysis of the presure drop in the combustion chamber inlet elbow. This study was conducted to observe the phenomenon of fluid flow and pressure distribution that occurs at elbow 900 using SolidWorks 2011. The study was conducted by comparing the magnitude of pressure drop due to the addition of guide vanes in the elbow 90°.

The results show pressure drop decreases with the addition of guide vanes in the elbow at the bottom of 0.54% at a flow rate of 5.73 m /s, 10.42% at a flow rate of 6.78 m/ s,and by 11.29% at a flow rate of 7.72 m /s. From the results of the study research suggested that the analysis performed on the pressure drop that occurs in the combustion chamber so that the performance and efficiency of the turbine can be increased again."

"Penelitian ini memperlihatkan fenomena aliran fluida campuran antara udara dan gas sintetik di dalam cyclone gas burner. Pengamatan berfokus pada fenomena intensitas turbulen, energi kinetik turbulen, dan kecepatan aliran percampuran udara dan gas sintetik akibat variasi posisi inlet cyclone gas burner dengan pemodelan menggunakan ANSYS Fluent. Pengamatan pemodelan fenomena percampuran ini digunakan untuk melihat desain yang paling optimum untuk cyclone gas burner dengan debit konstan aliran udara dan gas sintetik masing-masing 11,38 x 10-4 m3/s dan 8,06 x 10-4 m3/s. Gas sintetik merupakan produk gasifikasi biomassa sekam padi tipe fixed bed downdraft gasifier dengan komposisinya 50% N2, 3% CH4, 18% H2, 19% CO, dan 10% CO2.

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This research showed the phenomena of fluid flow between the mixing flow between air and synthetic gas in cyclone gas burner. The observations focused on the phenomenon of turbulence intensity, turbulent kinetic energy, and the flow velocity of air and synthetic gas mixture as a result of variations in cyclone gas burner inlet position using ANSYS FLUENT modeling. Observating of mixing phenomena modeling is used to view the most optimum design for cyclone gas burner with constant air and synthetic gas each flow rates is 11,38 x 10-4 m3/s and 5,5 x 10-4 m3/s. Synthetic gas is rice husk biomass gasification product using fixed bed downdraft gasifier with 50% N2, 3% CH4, 18% H2, 19% CO, and 10% CO2 composition."

"Telah berhasil dibuat sebuah alat pengukuran arah dan kecepatan angin (anemometer) untuk menghitung turbulensi dan analisa potensi angin. Dengan mengukur potensi angin bisa didapat informasi tentang angin yang nantinya informasi angin tersebut dapat digunakan untuk keperluan pemanfaatan angin. Dari pengukuran potensi angin didapat data-data sebagai berikut frekwensi kecepatan angin tertinggi adalah 1 m/s dengan arah angin pada timur laut-timur atau 45° - 90°. Semakin besar kecepatan angin semakin tinggi pula potensi angin.

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This thesis have successfully created an instrument measuring wind speed and direction (anemometer) to calculate turbulence and analyze the potential of wind. By measuring the potential of wind can be obtained information about the wind that the wind information will be used for utilization of wind. From wind potential measurement data obtained following the highest frequency of wind speed is 1 m / s with the direction of the wind on the north-east or 45° - 90°. The greater the wind speed, the higher the potential for wind."

"This fourth issue on "progress in turbulence" is based on the fourth ITI conference (ITI interdisciplinary turbulence initiative), which took place in Bertinoro, North Italy. Leading researchers from the engineering and physical sciences presented latest results in turbulence research. Basic as well as applied research is driven by the rather notorious difficult and essentially unsolved problem of turbulence. In this collection of contributions clear progress can be seen in different aspects, ranging from new quality of numerical simulations to new concepts of experimental investigations and new theoretical developments. The importance of turbulence is shown for a wide range of applications including: combustion, energy, flow control, urban flows, are few examples found in this volume. A motivation was to bring fundamentals of turbulence in connection with renewable energy. This lead us to add a special topic relevant to the impact of turbulence on the wind energy conversion. The structure of the present book is as such that contributions have been bundled according to covering topics i.e. I Basic Turbulence Aspects, II Particle Laden Flows, III Modeling and Simulations, IV, Experimental Methods, V Special Flows, VI Atmospheric Boundary Layer, VII Boundary Layer, VIII Wind Energy and IX Convection. This book is dedicated to the memory of Prof. Tim Nickels. Shortly after giving an invited lecture at the 4th ITI conference, the turbulence community lost a world-class scientist, a friend and devoted family man."