JPS5838358B2 - Duct propeller nozzle - Google Patents
Duct propeller nozzleInfo
- Publication number
- JPS5838358B2 JPS5838358B2 JP50014960A JP1496075A JPS5838358B2 JP S5838358 B2 JPS5838358 B2 JP S5838358B2 JP 50014960 A JP50014960 A JP 50014960A JP 1496075 A JP1496075 A JP 1496075A JP S5838358 B2 JPS5838358 B2 JP S5838358B2
- Authority
- JP
- Japan
- Prior art keywords
- duct
- propeller
- conduit
- wake
- propeller nozzle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
Landscapes
- Jet Pumps And Other Pumps (AREA)
Description
【発明の詳細な説明】
本発明はダクトプロペラに於ける高速の後流をダクト前
面に誘導して伴流の加速を計ることを目的とする発明で
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention aims to measure the acceleration of the wake by guiding the high-speed wake of a duct propeller to the front of the duct.
現時、船の推進効率を高揚する目的に於でプロペラの外
周にダクトを取付けることが実施せられている。At present, ducts are installed around the outer circumference of propellers in order to increase the propulsion efficiency of ships.
然るに船尾に取付けられたダクトプロペラは不均一伴流
中で作動するため種々の問題を呈示するものであり、そ
の一例として一軸船の場合、ダクトの上下位置に於で大
きな伴流があり、之がためプロペラに流入する速度を減
退して推進効率を低下する外、キャビテーションの発生
並に船体振動と騒音の原因になることが判明せられてい
る。However, the duct propeller installed at the stern of the ship presents various problems because it operates in a non-uniform wake.One example of this is in the case of a single-shaft ship, where there is a large wake at the top and bottom of the duct. It has been found that this not only reduces the velocity of water flowing into the propeller and reduces propulsion efficiency, but also causes cavitation, hull vibration, and noise.
本発明、その推進効率の低下を防止し各種障害の除去を
計るものである。The present invention aims to prevent the propulsion efficiency from decreasing and eliminate various obstacles.
即ち、第１図及び第２図において、プロペラ５を内装す
るダクトプロペラに於いてダクト本体１の出口側の内周
面に前方に向けて流水の吸引孔３を、入口側の内周面に
後方に向けて流水の噴射孔４を夫々開口した複数本の導
管２，２をダクト本体１に装備するものであり、ダクト
１内を流動する後流は高速に於いてダクト本体１の出口
側に開口する流水の吸引孔３から吸引し導管２を経て入
口側に開口する噴射孔４よりプロペラ５に向って噴出さ
せるものである。That is, in FIGS. 1 and 2, in a duct propeller in which a propeller 5 is installed, a suction hole 3 for flowing water is formed forward on the inner circumferential surface of the outlet side of the duct body 1, and a suction hole 3 for flowing water is formed on the inner circumferential surface of the inlet side of the duct body 1. The duct body 1 is equipped with a plurality of conduits 2, 2 each having a flowing water injection hole 4 opening toward the rear, and the wake flowing inside the duct 1 is directed toward the outlet side of the duct body 1 at high speed. Flowing water is sucked through a suction hole 3 that opens to the inside, passes through a conduit 2, and is ejected toward a propeller 5 from an injection hole 4 that opens on the inlet side.
然して、この導管２は第３図の如くダクトの外面に沿わ
せて設置する場合と第６図の如くダクト内を通して設置
する場合があり、其の取付数と位置に対しては制限する
ことなく、整流の目的に達する様に選定する。However, this conduit 2 may be installed along the outer surface of the duct as shown in Fig. 3, or it may be installed through the inside of the duct as shown in Fig. 6, and there are no restrictions on the number and position of the conduit. , selected to achieve the purpose of rectification.
又、導管２の形状は断面を半円形にすることが流動に対
する抵抗を少くするものである。Further, the shape of the conduit 2 is such that the cross section is semicircular to reduce resistance to flow.
斯くして、ダクト内を流動する後流を再び吸弓孔から導
管を通じてダクト前面の入口側に誘導してプロペラに噴
射させることにより、流水の伴流に積極的な加速を与え
て流入速度を促進し推進効率の低下を阻止させると共に
キャビテーションの発生を減殺し振動、騒音の要因の解
消を計り船舶運行能率を著しく増進させる作用効果を具
備し極めて優秀且つ進歩した技術発明である○In this way, the wake flowing in the duct is guided again from the bow hole through the conduit to the entrance side of the front of the duct and injected into the propeller, giving active acceleration to the wake of flowing water and increasing the inflow velocity. It is an extremely excellent and advanced technical invention that has the effect of promoting and preventing the decline in propulsion efficiency, reducing the occurrence of cavitation, eliminating the causes of vibration and noise, and significantly increasing ship operation efficiency.○
添附図面は本発明の実施例を図示するものであり、第１
図は導管がダクトの外面に沿って設置した場合の側面図
、第２図は同端面図、第３図は拡大断面図、第４図は導
管がダクトの内を通じて設置した場合の側面図、第５図
は同端面図、第６図は第４図の一部拡大断面図である。
１・・・・・・ダクト本体、
２・・・・・・導管、
３・・・・・・吸引孔、
４・・・・・・噴射孔、
５・・・・・・プロペラ。The accompanying drawings illustrate embodiments of the present invention, and the first
The figure is a side view when the conduit is installed along the outer surface of the duct, Figure 2 is an end view, Figure 3 is an enlarged sectional view, and Figure 4 is a side view when the conduit is installed through the inside of the duct. FIG. 5 is an end view of the same, and FIG. 6 is a partially enlarged sectional view of FIG. 4. 1... Duct body, 2... Conduit, 3... Suction hole, 4... Injection hole, 5... Propeller.
Claims (1)
向けて開口した吸引孔と、入口側内周面に後方に向けて
開口した噴射孔とを夫々有する複数本の導管を、ダクト
本体に配管したことを特徴とするダクトプロペラの伴流
加速装置。1. A plurality of conduits are installed in the duct body, each having a suction hole that opens toward the front on the inner circumferential surface on the exit side of the duct that houses the propeller, and an injection hole that opens toward the rear on the inner circumferential surface on the inlet side. A ducted propeller wake accelerator characterized by piping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50014960A JPS5838358B2 (en) | 1975-02-04 | 1975-02-04 | Duct propeller nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50014960A JPS5838358B2 (en) | 1975-02-04 | 1975-02-04 | Duct propeller nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5189690A JPS5189690A (en) | 1976-08-05 |
| JPS5838358B2 true JPS5838358B2 (en) | 1983-08-22 |
Family
ID=11875533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50014960A Expired JPS5838358B2 (en) | 1975-02-04 | 1975-02-04 | Duct propeller nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5838358B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06156378A (en) * | 1992-11-30 | 1994-06-03 | Nippon Buroaa Kk | Ducted screw for vessel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5011674A (en) * | 1973-06-01 | 1975-02-06 |
-
1975
- 1975-02-04 JP JP50014960A patent/JPS5838358B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5011674A (en) * | 1973-06-01 | 1975-02-06 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5189690A (en) | 1976-08-05 |
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