Studies on Matching the Gear Size to the Engine Power of the Trawler

大型拖網船主機馬力與漁具規模的研究

黃正清(James C. C. Huang) ； 陳龍陽(L. Y. Cheng) ； 戚桐欣(T. H. Chi) ； 李宗銘(C. M. Lee) ； 李燦然(T. J. Lee)

《臺灣水產學會刊》 2卷2期 (1973/12) Pp. 1-10

https://doi.org/10.29822/JFST.197312.0001

摘要

1．爲了獲得國內新建造大型拖網船主機馬力能配合漁具規模的基礎資料起見筆者隨民間漁船光陽82號出海，實施一連串的作業試驗，同時比較以往使用的兩片網具配置V型網板與新設計的六片網具配置立型網板在水中的力學性能？另一方面我們更探討大型拖網船本身曳網力等問題，玆將試驗結果摘要於後：
(1)光陽82號拖網船在作業中，所受的曳網張力（T:噸）與拖行速度(V:m/sec)的關係因使用漁具的不同而異，其關係式爲：
T=3.7 V^0.88（兩片網具配置V型網板）
T=3.2 V^1.56（六片網具配置立型網板）
(2)拖網作業中，拖行速度約略與曳網力成比例，卽拖行速度與拖網船的有效馬力成正比。
(3)光陽82號拖網船的軸馬力(S.H.P.)等於主機實際負荷與全負荷比的立方根及主機最高廻轉速(R.P.M.)的乘積。
(4)拖行速度(V:m/sec)在任何情況下均與主機轉數(R.P.M.)成比例。
(5)拖行速度(V:m/sec)與網口高度的關係如下列方式所示。
H=9.87 V^(-1.46)
H=5.51 V^(-0.92)
(6)拖行速度(V:m/sec)與網地抵抗(T:噸)的關係爲
R(下标 n1)=2.1 V^(1.03)
R(下标 n2)=3.2 V^(1.22)
(7)網板的展開距離(D:m)與施行速度之關係如圖10所示。

並列摘要

1．The results obtained from the field experiments on the towing power of No. 82 Kwang-Yang stern trawler and on the comparative working be havior of the usual two-panel trawl net with the V-door (Fig. 1-2) and a six-panel trawl net with the up-right otter board (Fig. 3-4). Aresummarized as follows:
(1) The tension in the warp, T (ton), of No. 82 Kwang-Yang in relation to the towing speed, V (m/sec), was expressed in the following empirical formulae respectively for different combinations. (Fig. 5).
T=3.7 V^0.88 (a two-panel trawl net with the V-door)
T=3.2 V^1.56(a six-panel trawl net with the up-right otter boards)
(2) The towing speed, V(m/sec), was approximately proportional to the towing power; that is proportional to the E(subscript N). H. P. (Fig. 6.)
(3) The shaft horse power, S. H. P., of the No. 82 Kang-Yang trawler equals the accumulation of the full load main engine revolution, R. P. M. times the cubic root of the proportional value of the full load and the required load (Fig.7).
(4) The towing speed, V(m/sec), was approximately proportional to the engine revolution, R. P. M., under any conditions (Fig.8).
(5) The headline height of the trawl net in relation to the towing speed, V(m/sec), was expressed in the following empirical formulae (Fig.9).
H=9.87 V^(-1.48)(a two-panel trawl net with the V-door)
H=5.51 V^(-0.98)(a six-panel trawl net with the up-right otter boards)
(6) The resistance of the net, R(subscript n)(ton), in relation to the towing speed, V(m/sec), was expressed in the R(subscript n1)=2.1 V^1.03
R(subscript n2)=3.2 V^(1.22)
(7) The relation between the spread distance of the otter boards, D(m), and the towing speed within a range of 1-3 m/sec was shown in Fig. 10.