A Flow Field Uniform Device Based on Shrinkage Curve Design

Abstract

The invention relates to a flow field uniformizing device designed based on a contraction curve and belongs to the field of vibration noise control of liquid-filled pipelines. The flow field uniformizing device comprises a sleeve, a blade and a curve contraction body, wherein the curve contraction body is arranged inside the sleeve; the root of the blade is fixedly connected with the curve contraction body, and the tip of the blade is fixedly connected with the sleeve. The flow field uniformizing device provided by the invention is designed based on the flow channel contraction and expansion curve and achieves the purpose of rectifying fluid in the axial direction; with the adoption of a circumferential blade diversion cutting design, the effect of performing flow passage division on the fluid in the circumferential direction is achieved, and the purpose of rectifying and uniformizing a turbulent flow field within a limited length is ultimately achieved; the flow field uniformizing device is compact in structure, low in demand on mounting space and suitable for being mounted at the pump inlet end with poorer inlet flow state and at the downstream of a valve and is used for improving the speed and the pressure uniformity of the flow field and reducing the vibration noise of the pump and the valve.

Description

technical field [0001] The invention relates to a flow field uniform device designed based on shrinkage curves and using blades, belonging to the field of vibration and noise control of liquid-filled pipelines. Background technique [0002] Generally speaking, the interior space of the engine room and other cabins of large ships is limited, and there is not enough space to arrange straight pipe sections for rectification at the pump inlet and valve outlet positions, and the excessively rapid system pipeline direction will directly affect the inflow status of water pumps and other equipment, resulting in The inlet velocity field of the flow channel at the inlet part of the impeller is distorted. According to the fluid inlet velocity triangle of the turbomachinery, too small or too large inlet velocity angle will cause the fluid to separate at the impeller blades. The shaft frequency and blade frequency noise of the pump are greatly increased. Long-term operation of the equi...

AI Technical Summary

Problems solved by technology

[0002] Generally speaking, the interior space of the engine room and other cabins of large ships is limited, and there is not enough space to arrange straight pipe sections for rectification at the pump inlet and valve outlet positions, and the excessively rapid system pipeline direction will directly affect the inflow status of water pumps and other equipment, resulting in Distortion occurs in the inlet velocity field of the flow channel at the inlet part of the impeller

According to the fluid inlet velocity triangle of the turbomachinery, too small or too large inlet velocity angle will cause the fluid to separate at the impeller blades. The shaft frequency and blade frequency noise of the pump are greatly increased

Long-term operation of the equipment in this imported state will reduce the service life of the equipment. In addition, the vibration of the equipment will increase and generate vibration noise, which will radiate noise outward through the system pipe network and the sea port, affecting the stealth performance of the ship.

At present, the rectification design for the inlet elbow of the pump and the flow field of the valve outlet is concentrated on the guide vane, but the guide vane has high requirements for processing and installation angle, and the effect is poor

At present, there has not been a flow field uniform device that can be applied in the field of fluid media such as water and oil, and can improve the flow field uniformity in a relatively short length range.

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