• Transactions of the Korean hydrogen and new energy society
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• v.23 no.2
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• pp.183-190
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• 2012

The research shows the experiment results according to the combustion characteristics and configuration of the linear generator of powerpack for the generating power applying the 2-stroke compact linear engine. The powerpack used in this paper consists of 2-stroke linear engine, linear generator and air compressor parts. For identifying the combustion characteristics and generating power of linear engine, some parameters were varied sucha as electric load, fuel input calorie, spark timing delay and equivalence ratio. Also generating power was confirmed at each operation conditions, when the air gap length of linear generator part was changed as each 1.0 mm and 2.0 mm. During the all operations, intake air was inputted under the wide open throttle. Mass flow rate of air and fuel was changed using mass flow controller, after these were premixed by premixture device, and then premixed gas was supplied directly into each cylinder. As a result, piston frequency and combustion characteristics were different at each conditions according to parameters affecting the combustion such as fuel input calorie, resistive load, spark timing delay and equivalence ratio. Consequently, these had an effect on generating power.

• Transactions of the Korean hydrogen and new energy society
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• v.24 no.3
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• pp.206-215
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• 2013

A linear engine has advantages in terms of volume and weight, because there are no rotating parts. Thus, it is considered that linear engines might be suitable in hybrid vehicles. However, the linear engine has challenges in terms of the engine ignition timing and efficiency, so the engine has not been commercialized yet. In this study, the dynamic and combustion characteristics of the linear engine might be specified by various loads which are changed by conductance. The engine used in this experiment consists of two combustion chambers, four compressors, two linear alternators and a mover with a piston head and magnets. The way fuel is supplied in the experiment is by propane fuel being mixed with air in the carburetor, then being delivered into combustion cylinders via compressors. In the experiment, conductance is altered from 0.04 to 0.16mho, and the ignition timing is ahead by just 5.0mm from the maximum stroke. As a result of the experiment, frequency, stroke, input calories and maximum pressure are decreased when the conductance is increased. Meanwhile, IMEP, generation efficiency and electric power are increased when the conductance is increased. Therefore, it might confirm that high conductance generates more efficient electric power, but that thermal efficiency is the highest in the state of 0.08mho.