内燃機關の熱効率改善に對する新提案 : 分離壓縮方式
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概要
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It is theoretically clear that the improvement of the heat engine depends upon the following three factors : high combustion speed, high compression ratio, and high air excess. As to the present engines these factors are inevitably restricted due to its own characteristics upon which the writer explains in details by the actual and also numerical data. Deducing from this explanation, remarkable improvement of the thermal efficiency will be attained by the separate compression system, which cycle will be generated as follows : 1. Necessary air for combustion is compressed in one chamber to high pressure and high temperature, 2. Fuel is injected into inert burned gas medium separately in another chamber, and compressed to high pressure and high temperature, 3. Then these air and gaeous fuel mixture are communicated to each other, and instantly ignited of itself, 4. After combustion, the burned gas expands, and develops work done. This system of the internal combustion engine will be formed in two types, the positive and the negative. In the former type two cylinders are used for air and fuel respectively, and gaseous fuel mixture is compressed positively to high compress on ratio, but in the latt r type only one cylinder is used to compress the air, and fuel is gasified and heated to high tempe ature in a small chamber near the cylinder top, in which the inert high pressure and high temperature b rned gas remains separately from the main cylinder shut out by control valve during the expansion stroke. By the above mentioned systems air will be compressed to about 40 atmospheres and 600℃, and fuel will be gasified easily to 15 atmospheres and 1000℃. Such condition of air and fuel gas, when communinated to each other, possess excessive high potential combustibility, which was called in some extent "detonation" in gasoline engine. Three principal factors for improvement of thermal efficiency ; high combustion speed, high compress on ratio, and high air excess, will be realised by this separate compression system, which has been patented recenetly. The writer is convinced that this system will contribute to improve the fuel problem both in- and out-land.
- 社団法人日本船舶海洋工学会の論文