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Thermodynamics Interaction Studies Solids, Liquids and Gases Part 6

Tham khảo tài liệu 'thermodynamics interaction studies solids, liquids and gases part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 290 Thermodynamics - Interaction Studies - Solids Liquids and Gases 5.2.2 Effects of dimensionless load coefficient Increasing the dimensionless load coefficient means the load demand of the linear alternator is increasing and the electromagnetic force produced by the linear alternator is increasing. Four different dimensionless load coefficients M 1 M 2 M 3 M 4 were chosen to investigate the effects of changing the load of the linear alternator. The load coefficient was varied by changing the value of the load resistance. According to the results calculated the dimensionless load coefficient has large impact on different parameters studied and can affect the operating condition of FPLA. According to Figs.l4 15 as the dimensionless load coefficient increases the dimensionless compression ratio and dimensionless frequency decrease since bigger electromagnetic force is acting on the translator. The highest dimensionless effective efficiency is changing with different dimensionless load coefficient and effective stroke length to bore ratio. As is shown in Fig.14 when the effective stroke length to bore ratio is less than 0.67 smaller dimensionless load coefficient would lead to a higher dimensionless effective efficiency and when the effective stroke length to bore ratio is more than 1.0 the larger the load coefficient the higher the dimensionless effective efficiency. The reason behind these is believed to be caused by the percentage of heat released before top dead center TDC which is strongly determined by the frequency of the translator. Fig. 14. Effects of dimensionless load coefficient to dimensionless compression ratio and dimensionless effective efficiency As is shown in Fig.15 smallest dimensionless load coefficient lead to the highest dimensionless power output although the dimensionless effective efficiency is the lowest since the dimensionless frequency with smaller load coefficient is higher. It is more obvious when the effective stroke length to bore .