CN87204866U

CN87204866U - Simple compensating guid tube for propeller of ship

Info

Publication number: CN87204866U
Application number: CN 87204866
Authority: CN
Inventors: 钱文豪
Original assignee: INST NO 708 RESEARCH ACADEMY N
Current assignee: INST NO 708 RESEARCH ACADEMY N
Priority date: 1987-03-26
Filing date: 1987-03-26
Publication date: 1988-05-04

Abstract

The utility model relates to a simple compensating guide tube for propeller of ship used to enhance the propulsion efficiency of the propeller, and save energy. The compensating guide tubes are formed by a right half ring and a left half ring, and the cross section of the compensating guide tubes are the angle-bending type simplified wing shape which are formed by the circular arc of the guide edge and three to four straight lines; the compensating guide tubes are arranged on both ends of the front and longitudinal center-plane of the tail propeller and is placed slantingly above the top of the propeller shaft; the setting angle alpha, beta, gamma and the convergence angle zeta are based on each ship model test to confirm the best value. The distance of the compensating guide tubes and the propeller are 0.1-0.3 times as long as the propeller. The utility model has the advantages of simple structure, convenient process, low cost, and wide range of the application. The simple compensating guide tube for propeller of ship can form various ship propulsion energy-saving devices respectively with contra-fins, thrust fins, flow-guiding cover, asymmetric tail, etc. Based on the experiment, the energy saving effect of the utility model can reach the whole ship total power by 7-12.8%.

Description

Simple compensating guid tube for propeller of ship

The utility model is a kind of propulsion of ship energy saver.

Existing boats and ships shrouded propeller and coaxial preposition shrouded propeller commonly used, though improve the screw propeller influent stream, generation is than high thrust, but because the resistance of this conduit own is big, so only under heavily loaded situation, can obtain better effects, moreover the common conduit size is big, and complexity is installed, and the air that is subject to oar simultaneously degrades.West Germany in 1984 is permitted Nei Keluote (Schneekluth) and is developed oar forward streams compensating duct, comparing yardstick with the former dwindles, resistance own reduces, and conduit adopts the wing tangent plane, and inside face is a smooth curve, but owing to be double curved surface, need adopt extreme misery technology bent plate during machine-shaping, long processing time, difficulty is big, the standard that is not easy to do is so error is bigger.With the combined energy saver of this compensating duct the composite set of compensating duct and asymmetric tail is only arranged.

Task of the present utility model is that a kind of energy-saving effect of development is better than common propeller nozzle, and use face is wider, and construction technology is easy, lower-cost simple compensation conduit.

The utility model proposes the simple and easy compensating duct of a kind of screw propeller, by about two semi-rings form, its minor axis and major diameter are respectively 0.3-0.6 times and 0.65-0.85 times of diameter of propeller, the conduit tangent plane is to simplify airfoil by the knuckle line style of guide lug circular arc and three to four rectilinear(-al)s, the tangent plane chord length is 0.3-0.6 a times of conduit minor axis, and tangent plane thickness is 0.12-0.18 times of chord length.It indulges the midship section both sides before being loaded on the stern oar, is offset to oar axle top, and its stagger angle is respectively α, β, γ, and angle of throat is δ (as shown in Figure 1).The stagger angle difference of conduit left and right sides semi-ring is respectively α: 5 °-11 ° (left semi-ring), 4.5 °-10 ° (right semi-ring); β: 0.5 °-8 ° (left semi-ring), 3 °-9 ° (right semi-ring); γ: 3 °-9 °; δ: 6 °-15 °.Optimal values is relevant with hull afterbody line style and propeller load, can determine by model self-propulsion test separately.Compensating duct rear end to the distance of screw propeller be this diameter of propeller 0.1-0.3 doubly.

The utility model is compared with common compensating duct, have simple in structure, yardstick is little, its diameter only is the latter's 35%, skin area only is the latter's 12%, volume has only the latter's 4%, and can cancel the ring stiffener of the latter at disc circle week place.The utility model is not degraded by propeller cavitation, also can reduce the vibration that causes because of propeller cavitation, and it is obvious especially to suppress effect; Having compensating duct now with West Germany compares, the utility model (only needing cold rolling bending) easy to process, cost is low, easily meet the requirements of precision, and it is applied widely, can form the propulsion of ship energy saver of various ways with streamlined reefer housing, thrust fin, rectification fin, asymmetric tail etc., the combination of (1) compensating duct and streamlined reefer housing is wherein arranged; (2) compensating duct adds streamlined reefer housing and thrust fin combination; (3) left side is a compensating duct, and the left side is the rectification fin, adds the streamlined reefer housing combination behind the oar on the rudder; (4) compensating duct and asymmetric tail combination; (5) compensating duct, streamlined reefer housing, with asymmetric tail combination etc.

The utility model is applicable to block coefficient greater than 0.6, the single screw boats and ships that speed is not too high, and hull is plentiful more, and its effect is good more.This is because full formed ship wake field is extremely inhomogeneous, and serious flow separation phenomenon is arranged.

According to model test, the utility model is under the corresponding composite set situation of forming with streamlined reefer housing, thrust fin, rectification fin, asymmetric tail, and energy-saving effect can reach the 7-12.8% of full ship gross horsepower.With 27000 tons of bulge carriers is example, installs the utility model and composite set thereof additional, and the expense that installs additional adds up to 3.5 ten thousand yuan, and by energy-conservation 8% calculating, but 1 year fuel saving takes 7.5 ten thousand yuan (being equivalent to 375 tons of fuel oils), and initial cost is recoverable half a year.

To the obsolete vessel of operating, because machine is outmoded, power reduction, hull resistance increases, and machine, oar, hull cooperate not good, if add the utility model and composite set thereof, can obtain effect preferably aspect the speed of a ship or plane saving fuel oil and improve.For new design boats and ships, load onto the utility model and composite set thereof, the main engine power grade of designing before being unkitted is descended, obtain good and economic.

Description of drawings:

The compensating duct longitudinal section of Fig. 1, West Germany

The compensating duct vertical sectional view of Fig. 2, West Germany

The compensating duct horizontal cross of Fig. 3, West Germany

Fig. 4, simple and easy compensating duct longitudinal section

Fig. 5, simple and easy compensating duct vertical sectional view

Fig. 6, simple and easy compensating duct horizontal cross

Fig. 7, simple and easy compensating duct structure cutaway view

Fig. 8, rectification fin structure horizontal cross

Among the figure: 1, rudder; 2, streamlined reefer housing; 3, screw propeller; 4, compensating duct; 5, rectification fin; 6, hull; 7, prop shaft.

Claims

1, the simple and easy compensating duct of a kind of marine propeller, its technical characterictic is:

A, by about two semi-rings form, tangent plane is the simplification airfoil by the knuckle line style of guide lug circular arc and three to four rectilinear(-al)s, conduit minor axis and major diameter are respectively 0.3-0.6 times and 0.65-0.85 times of diameter of propeller, the tangent plane arc length is 0.3-0.6 a times of conduit minor axis, and tangent plane thickness is 0.12-0.18 times of arc length.

B, be installed on the vertical midship section both sides of hull before the stern propeller, be offset to prop shaft top, about the stagger angle of two semi-rings be respectively 2:5 °-11 ° (left side), 4.5 ° of-10 ° of (right side): β: 0.5 °-8 ° (left side), 3 ° of-9 ° of (right side): γ: 3 °-9 °: δ: 6 °-15 °.