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N. I. Wakayama, and N. Aso
[Combustion Science and Technology, Vol. 2, pp. 211-215, 1994]
Efficient air intake during shirt time spans of engines operating at high speeds is a significant problem. The present study describes the magnetic effect on pulsed air intake by an engine. It is well knows that oxygen which is paramagnetic is attracted by magnetic fields. For example, the magnetic attractive force acting on air( 1 mL) is calculated to be approximately 0.47 dyne when H=0.5 T and the gradients is 30 T/m. Therefore, magnetic fields are expected to affect pulsed air flows. In this paper we applied gradient magnetic fields (0.5 T, 30-40 T/m) to the air inlet of a 2-cycle S.I. engine (the swept volume : 20 mL) by using a pair of small permanent magnets (2×2×3 cm), and measured the transient behavior of the pulsed air flow velocity. Air flowed toward stronger magnetic fields at the inlet, and pulse trains (100 Hz) were observed. Experimental results suggest that the application of magnetic fields made both amplitude and period of velocity of pulsed air flow more regular than without magnetic fields. When the magnetic field was applied, the ratio of low amplitude pulse decreased and the oscillating frequency of the engine increased approximately 1%. When the engine was driven by an electric motor (960 RPM), the magnetic effect on pulsed air flow was studied similarly. When the field was applied, the time averaged velocity increased about 6%. This also suggest the magnetic promotion of the air intake in an engine. The present study suggests the possibility of magnetic control of pulsed air flow in engines.