Efficiency analysis of radial fan with back curved blade with different parameters by experiment design method

Today, the usage areas of fans are increasing considerably. With the increase in working and time spent in closed environments, the working performance of the fans is important. As the performance of the fans improves, the quality of life in indoor environments will increase and costs will decrease by eliminating inefficiencies. It is a fact that fans consume a lot of electricity. The efficient use of energy in fan systems can be achieved by changing or revising the main components that make up the fan systems. These main components consist of propeller, volute body and electric motor. In this thesis, design and optimization studies were carried out on a system with backward curved blades, volute body and 1.1 kW- 3000 rpm electric motor, which is used in closed areas and provides vacuuming of polluted air. Taguchi experimental design method is used for the reliability of these studies. Radial fans with backward curved blades have a wide range of applications. It is preferred because it works at high pressure and flow rates. However, it is seen in the performance characteristics that the pressure and efficiency start to decrease in overloads. In the thesis study, the electric motor and the volute body remain constant and the desired changes have been made on the geometric properties of the propeller. 3 factors and 4 levels were determined for efficiency analysis. The factors are the number of blades (6 pieces - 8 pieces - 9 pieces - 10 pieces), blade width (35 mm - 50 mm - 65 mm - 85 mm) and voltage value (20%-40%-60%-80%) is happening. All factors consist of 4 levels. Experiment combinations were created with the Taguchi experimental design method on the Minitab program. The orthogonal array was obtained as L16(4)3, and the propellers and experimental setup were prepared to test 16 different experimental combinations. Flow rates give us information as a general efficiency measure of fans. Therefore, the flow rate values are obtained from the air flow rate entering or leaving the volute fan. In this study, the value used for efficiency optimization was determined as the air inlet velocity. Measurements were made with anemometer device in all experimental combinations and recorded on the Minitab program. For S/N analysis, analyzes were obtained using the 'biggest is best' approach. The order of importance of the selected factors on efficiency, obtained from the analysis results, is listed as voltage value (%), blade width (mm) and number of blades. It is seen that the most optimal option is to operate the electric motor power at 80% voltage, the blade width is 65 mm and the number of blades is 9 pieces. It has been determined that the optimum result will save efficiency in radial fan systems. When the studies in the literature are examined, it has been determined that there is no research that examines the effect of fan blade number, most importantly blade width and power change on fan efficiency in backward curved blade radial fans. It is foreseen that the subject of this study has not been researched before, and the results of the study will contribute