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Volume 18 (1987 - 198･･･
- Issue 3 Pages 4-
- Issue 2 Pages 3-
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Volume 18, Issue 2
Displaying 1-4 of 4 articles from this issue
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Yukio SAKAI, Kiyoshi HIROSAWA, Takaaki MAEKAWA1987 Volume 18 Issue 2 Pages 3-9
Published: December 30, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe experimental study was made to investigate the knock-suppression effect and the performance in biogas and gasoline fuelled spark ignition engine. Using a CFR engine, this investigation was carried out to obtain the optimum engine performance operated under given biogas/gasoline ratios. The effects of various operating parameters related to compression ratio, spark timing and equivalence ratio on the engine performance data such as power output, fuel consumption and tendency to knock, were determined. The main results of this work may be summarized as folloes;
(1) In the case where the calorific ratio of biogas in a biogas-gasoline is about 30%, the antiknock effectiveness of the fuel is increased remarkably and knock-free operation is possible even with a compression ratio of 16:1.
(2) For biogas calorific ratio of 30%, and equivalence ratio of 1.05, both maximum power output and minimum fuel consumption are obtained at the compression ratio of 11-12, and the spark timing of 15° BTDC.
(3) Under engine operating conditions described above, the maximum power output decreases about 5%, however, the minimum fuel consumption is improved about 10%, than those for same engine using gasoline.View full abstractDownload PDF (874K) -
Shigeki KATSURA1987 Volume 18 Issue 2 Pages 10-17
Published: December 30, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe determination of structural loads such as lateral pressure and vertical friction force acting on farm tower silo walls are usually carried out using formulae specified in a building code or standard. In Japan, B. S. 5061 is used for these loads but as this code was established in England, it is pointed out that it might be unsuitable for actual condition in Japan.
In this paper, lateral pressures and vertical stresses on the wall of a steel tower silo containing dent corn silage were measured in the field. The diameter and the height of the silo were 2.5m and 7m, respectively. Moisture content of the silage was about 77% (W. B.). Measurement of the lateral pressures were performed by hand made pressure transducer using liquid. Vertical friction force were estimated from the tensile stresses measured on a slip of steel fixed on the top of the silo.
From the measurement, the maximum lateral pressure was about 5kPa. The distribution of the lateral pressure in the axial direction was similar to that obtained from the equation presented by Neubauer. Vertical friction force in the axial direction estimated from the tensile stresses can be assumed to increase with the square of the silage depth. But near the top of the silo, the increase of the friction force was less than the assumed value.View full abstractDownload PDF (961K) -
Ching-Loong TSAI, Kiyokazu GOTO, Ritsuya YAMASHITA1987 Volume 18 Issue 2 Pages 18-25
Published: December 30, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe application of the Storage Drying with Mixing Method to the rice drying facility was discussed by using two types of practical drying bin, round type and conventional type.
1) Mixing the half dried paddy and the high moisture paddy just received in the facility, the moisture content of both paddy became the average value. The standard deviation of the moisture content distribution decreased gradually after the mixing. Therefore, since the high moisture paddy is dried fairly rapidly, the rice quality can be kept by this method.
2) The mixing method was examined also by using the equipped storage bin in usual drying facility (called DS bin). The high and the low moisture content paddy was mixed by the rotation process; the fairly uniform moisture distribution then could be obtained with the moisture transfer between paddy kernels. Therefore, the DS bin can be used for the application of this method.
3) The change of paddy moisture content was simulated in case that the storage drying with mixing is adopted by using the measured conditions, for example air flow rate, moisture content of received paddy and working time of the drying bin. Since the actual change and the simulated result were quite similar, it became clear that the optimization of the drying facility can be discussed by using the simulation program developed by the authors.View full abstractDownload PDF (978K) -
Masaharu YASUTOMI, Noboru ADACHI1987 Volume 18 Issue 2 Pages 26-30
Published: December 30, 1987
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSDownload PDF (573K)
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