Hydrofoil blade top gap and attack angle adjusting system for water tunnel experiment

Abstract

The invention relates to a hydrofoil blade top gap and attack angle adjusting system for a water tunnel experiment and belongs to the technical field of water conservancy and hydropower engineering. The system is composed of a water tunnel observation section (1), fixing boards (3), locating nuts (4), supporting rods (5), a locating block (6), a hydrofoil connecting rod (7), an attack angle adjusting nut (8) and an elastic sealing structure. The two fixing boards (3) are spaced at a certain distance and fixed to a fixing face of the water tunnel observation section (1). The two supporting rods (5) are perpendicularly fixed to the two fixing boards (3) respectively, penetrate through through holes in the two ends of the locating block (6) and are located through the locating nuts (4). The smooth end of the hydrofoil connecting rod (7) penetrates through the fixing face of the water tunnel observation section (1) and is sealed through the elastic sealing structure and the threaded end of the water tunnel observation section (1) penetrates through the locating block (6) and is fixed through the attack angle adjusting nut (8). Compared with an existing system, the system is simple and compact in structure, capable of saving space, easy to move and detach, low in manufacturing cost and good in sealing performance.

Description

technical field [0001] The invention relates to a hydrofoil tip clearance and attack angle adjustment system for water tunnel experiments, and belongs to the technical fields of water conservancy and hydropower engineering and ocean ship engineering. Background technique [0002] The airfoil is the basic unit of the hydraulic machinery structure, and the research on the flow around the hydrofoil is of great significance to the study of the internal flow mechanism of the hydraulic machinery and the optimal design. [0003] In the transient process of propeller, turbo pump, hydraulic turbine start-up and shutdown, runaway, load increase and decrease, etc., the transient flow in the transient process will change the effective angle of attack of the lifting surface, and its internal flow is significantly different from the design condition. . Therefore, it is of great significance to understand the changes of hydrodynamic load and vibration of objects under non-design condition...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a hydrofoil blade tip clearance and angle of attack adjustment system for water tunnel experiments to solve the problems that existing hydrofoil blade tip clearance and attack angle adjustment devices are independent of each other, complex structure, and high experiment cost, which can realize hydrofoil blade tip clearance and attack angle adjustment system. Quantitative Adjustment of Wing Angle of Attack and Blade Tip Clearance

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