Nozzle flow PIV test device and method of water-spray propulsion ship model

Abstract

The invention, which belongs to the field of testing of a special propulsion ship model, particularly relates to a nozzle flow PIV test device and method of a water-spray propulsion ship model. The device comprises a water-spray propulsion ship model and an adjustable underwater PIV measuring system. The water-spray propulsion ship model includes a body model, a water spraying propeller nozzle anda water spraying propeller flow channel; the water spraying propeller flow channel is installed inside the body model; the water spraying propeller nozzle is installed at the edge of the body model;and the water spraying propeller nozzle and the water spraying propeller flow channel are connected. The adjustable underwater PIV measuring system includes a measuring cross section, a PIV lightningbody, a PIV connecting rod, a laser sheet light source, a front end camera, and a rear camera; the front end camera and the rear end camera are fixed inside the PIV lightning body; the PIV connectingrod is fixed above the PIV lightning body; the laser sheet light source is fixed inside the PIV lightning body and is arranged at the same side of the front end camera; and the measuring cross sectionis fixed at the lower surface of the PIV lightning body.

Description

technical field [0001] The invention belongs to the field of special propulsion ship model tests, and in particular relates to a PIV test device and method for the flow rate of a nozzle of a water jet propulsion ship model. Background technique [0002] In recent years, water jet propellers have been widely used in various types of high-speed warships and yachts. Propulsion is a propulsion method commonly used by high-speed ships, and water jet propulsion is gradually developing in the direction of large-scale and high-power. [0003] The self-propulsion test of the water jet propulsion ship model is an important step in predicting the navigation performance of the ship using water jet propulsion. Unlike the traditional propeller propulsion ship model, the net thrust of the ship model equipped with water jet propulsion is rarely mature. Therefore, the International Towed Tank Conference (ITTC) recommends the momentum-flux method for thrust conversion. The core of the moment...

AI Technical Summary

Problems solved by technology

In terms of testing the flow field around the water jet propulsion ship model, the existing patents have proposed the protection of the test method for the inlet flow. Compared with the flow field characteristics of the inlet flow area, the nozzle flow has high flow velocity, strong radial diffusion, and The characteristics of mutual interference between the surrounding flow and the high-speed jet flow, so the test of the nozzle flow has more limiting factors and the measurement is more difficult

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