2サイクル機関の掃気流に関する研究 : 第一報水模型実験装置のための予備実験および実験結果を整理するための近似理論掃気曲線

概要

論文の詳細を見る
In this paper, the means for investigating of the fundamental characteristics of the scavenging in two-stroke cycle engines is described. Coloured solution of salt was utilized for a scavenging flow, the density of which was measured by an aerometer. By means of the two dimensional and three dimensional water-model apparatus, it was planned to obtain and examine the properties of the port, and to measure the scavenging flow in the cylinder and its efficiency simultaneously and with comparative accuracy. In addition a theoretical formula has been made upon consideration of the short circuitting part and the mixing part inside the cylinder. Also a scavenging characteristic curve has been established to arrange the results of the experiments. If the inside of the cylinder is scavenged with a certain delivery ratio by pure water or salt solution, the specific gravity of the liquid inside the cylinder changes We found that the relation between the specific gravity of solutions and their scavenging efficienay can be defined as a linear functional one. With a temperature correction made in connection with this relation, the scavenging efficiency is obtained only by measuring its specific gravity of the liquid in the cylinder after its scavenging action. The features of the liquids flow should be observed on a moving picture taken during a scavenging action, when at the same time its scavenging efficiency in this cycle should be measured. In order to speculate the results of the experiments obtained through such processes mentioned above, it is most preferable to establish, "a scavenging characteristic curve". There are various theories on this matter; however, in our case, following Prof. Maekawa who expressed the short circuitting rate with (1-k) and the rate of diffusion with m, we adapted a formula which was reformed by the definitions employed in the model experiments. Accordingly we got a scavenging characterisic curue which was expressed by a group of curves gained from this theoretical formula in which delivery ratio was denoted by 1, scavenging efficiency by η_s, volumetric efficiency by η_v and trapping efficiency by η_<tr>. By plotting the value of the results of the experimeuts on the curve, we can obtain the quantity of short circuit, the rate of diffuison and various efficiencies. Furthermore, the effect of temperature can be known from this formula. When the temperature difference between a new charge and a residual gas becomes larger, η_v of an actual engine becomes larger than that of a model, and η_s is always larger than η_v.
明治大学の論文

2サイクル機関の掃気流に関する研究 : 第一報水模型実験装置のための予備実験および実験結果を整理するための近似理論掃気曲線

スポンサーリンク

概要

著者

関連論文

スポンサーリンク

2サイクル機関の掃気流に関する研究 : 第一報 水模型実験装置のための予備実験および実験結果を整理するための近似理論掃気曲線

スポンサーリンク

概要

著者

関連論文

スポンサーリンク

2サイクル機関の掃気流に関する研究 : 第一報水模型実験装置のための予備実験および実験結果を整理するための近似理論掃気曲線