PERANCANGAN DAN EVALUASI AERODINAMIK TURBIN AKSIAL PADA SISTEM TURBIN GAS MIKRO DAYA 1500W

• Main Author: Azzamy Fuad, Faishal
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62068
• Institution: Institut Teknologi Bandung

At the present day, there exists an increase in demand for electrical power generation and storage. With the expeditious development of battery technology, multiple solutions to the storage problem have been developed, led mainly by the development of the lithium-ion battery. Despite those developments, lithium-ion battery technology still falls behind in terms of energy density, reaching a maximum density of 0.94 MJ/kg, which is in stark contrast to liquid fuels, such as gasoline with 44 MJ/kg of energy density. As such, there exists an incentive to develop miniaturized systems which can utilize the energy density of liquid fuels, on devices which traditionally are battery-powered. One such system to fulfill that need is a micro gas turbine system, which utilizes the Brayton cycle. In this research, a micro-scale axial turbine has been designed as part of a micro gas turbine system to generate 1500W of power. Simplifications to the design including constant (nontwisted) nozzle guide vane and rotor blades as well as a constant annulus crosssection were done in hopes of increasing manufacturability. Three-dimensional steady-state simulations were conducted to analyze overall turbine performance. Differing configurations with varying nozzle-to-rotor axial gap (10%, 30%, and 50% of upwind chord) as well as rotor-to-shroud radial clearance (0.4 mm, 0.5 mm, 0.6 mm) were investigated to determine effects on efficiency and power output. Results show that turbine efficiency decreases with increasing radial clearance, with the highest efficiency obtained with 0.4 mm of radial clearance. Meanwhile, variations in axial gap affect efficiency less strongly, though the highest efficiencies were those with 30% axial gaps, followed by 50% axial gaps, and the lowest having 10% axial gaps. Simulations show the turbine to be capable of generating 3.7 kW of power at its design point, with a 78.8% efficiency.