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Drainage device suitable for multi-jet pump ship resistance model test

A model test, ship technology, applied in ship parts, ship construction, ship design, etc., to achieve the effect of improving accuracy

Inactive Publication Date: 2020-12-15
708TH RES INST OF CSSC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the technical problem of how to improve the precision and accuracy of the water jet propulsion ship resistance test

Method used

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  • Drainage device suitable for multi-jet pump ship resistance model test
  • Drainage device suitable for multi-jet pump ship resistance model test
  • Drainage device suitable for multi-jet pump ship resistance model test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0029] In the case where the number of water jet propellers is an even number, take 4 jet pumps 9 as an example, press Figure 5 As shown, the diameter of the conventional nozzle 4 is 0.046m, and the rotational speed is 25r / s. The torque of the drive shaft 2 of the jet pump 9 is measured with a power meter, and the measured value is 0.637Nm; according to Image 6 As shown, an L-shaped nozzle drainage device 10 is installed behind the conventional nozzle 4, and the motor runs at 25r / s. At the same ship speed, the flow rate of a single jet pump 9 measured by a flowmeter 8 is 0.02m3 / s. The torque measurement of drive shaft 2 of 9 is 0.646Nm, which is the same as Figure 5 The difference shown is less than 1.5%, which proves that the L-shaped nozzle drainage device 10 has little influence on the impeller and the flow field near the inlet. In the case where the number of water jet propellers is an odd number, take 3 jet pumps 9 as an example, press Figure 7 As shown, the diamete...

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Abstract

The invention relates to a drainage device suitable for a multi-jet pump ship resistance model test, and belongs to the technical field of water jet propulsion ships. The drainage device comprises a driving shaft system, an inlet flow channel, an impeller, a nozzle and a nozzle drainage device, wherein the impeller is arranged on the driving shaft system, and the impeller is arranged in a channelcommunicating the inlet flow channel with the nozzle; and the nozzle drainage device used for uniformly discharging water to two sides of a ship body is arranged on the nozzle. According to the drainage device, in the water jet propulsion ship model resistance test, the L-shaped or T-shaped nozzle drainage device is connected to the rear end of the water jet propulsion device, so that water flow is transversely sprayed out from the L-shaped or T-shaped nozzle drainage device, and the thrust or resistance of the ship body is zero. In the resistance model test, the influence of the propeller onthe flow field near the inlet when the propeller works under a specific working condition is simulated, additional thrust or resistance is not generated, and the precision of the water jet propulsionship resistance model test is improved.

Description

technical field [0001] The invention relates to a drainage device suitable for a multi-jet pump ship resistance model test, belonging to the technical field of water jet propulsion ships. Background technique [0002] In the ship design stage, it is generally necessary to establish the interaction relationship between the propeller and the hull through model tests such as propeller open water, hull resistance and self-propulsion, so as to predict the rapid performance of the actual ship. For ships propulsed by propellers, generally the influence of the propeller on the hydrodynamics of the hull is limited to the stern area, and has little influence on the flow field in other areas of the hull. However, for water-jet propelled ships, since the inlet of the propulsion device is relatively forward at the bottom of the ship, the propeller will have a significant impact on the hull flow field near the inlet when the propeller is working; The inlet and nozzle of the water jet pro...

Claims

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Application Information

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IPC IPC(8): B63B71/00
CPCB63B71/00
Inventor 孙群范佘明吴琼沈兴荣韦红刚
Owner 708TH RES INST OF CSSC