A piezo-electromagnetic-rheological muffler for marine turbine engines

A technology of turbine engine and muffler, which is applied in the direction of engine components, combustion engines, machines/engines, etc. It can solve the problems of unsatisfactory exhaust muffler effect and poor high-frequency effect of the muffler, and achieve sound absorption frequency bandwidth and fast sound energy Transformation, the effect of high sound absorption coefficient

Active Publication Date: 2020-06-05
ZHEJIANG NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

At present, the exhaust muffler of the turbine engine is mainly developed based on the principle of anti-resistance compound noise reduction. The exhaust noise reduction effect of the muffler is not ideal. The muffler that eliminates broadband and high-frequency noise is very important to improve the quality of the turbine engine

Method used

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  • A piezo-electromagnetic-rheological muffler for marine turbine engines
  • A piezo-electromagnetic-rheological muffler for marine turbine engines
  • A piezo-electromagnetic-rheological muffler for marine turbine engines

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Embodiment Construction

[0013] A piezoelectric electromagnetic rheological muffler for marine turbine engines, comprising a hollow cylinder V, an air inlet pipe a is arranged along one end of the cylinder V off the axis, and an air outlet pipe is arranged along the axis of the other end of the cylinder V p; Cylinder V includes a shell b and a fixed body c. There are several cylindrical holes on the fixed body c, and a magnetic cone X is fixed in the cylindrical hole; the magnetic cone X is covered by a cylindrical permanent magnet d and a magnetized permanent magnet. The conical magnetorheological fluid on the magnet d is composed of h1; the cylinder V is divided into the first chamber A and the second chamber by the left partition g and the right partition m along the vertical direction of the cylinder V axis. body B and the third chamber C, the air inlet pipe a communicates with the first chamber A, and the outlet pipe p communicates with the third chamber C; the left partition g and the right parti...

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Abstract

The invention relates to a turbine engine muffler, in particular to a piezoelectric magneto-rheological muffler for a ship turbine engine. An air inlet pipe and an air outlet pipe are arranged at thetwo ends of a cylindrical barrel body, a magnetic cone is arranged on the barrel body, the magnetic cone is composed of a cylindrical permanent magnet and a conical magnetorheological fluid I which ismagnetized and then covers the permanent magnet; the interior of the barrel body is divided into three cavities by a left partition plate and a right partition plate; fan blades sleeve a rotary shaftin a first cavity, and the fan blades are formed by bonding a circular-ring-shaped piezoelectric wafer and a metal substrate; and a damping unit is arranged on the rotating shaft in a second cavity,the damping unit comprises an input component, a magnetorheological fluid II, a shell fixedly connected with the right partition board, a middle disc and an adjusting device. The piezoelectric magneto-rheological muffler for the ship turbine engine has the advantages that acoustic energy is converted into heat energy by means of the continuous change of the acoustic impedance gradient of the magnetic cone, and the sound absorption coefficient is high; the fan blades are used for converting the kinetic energy of an airflow into mechanical energy, and a sound absorption frequency band is wide.

Description

technical field [0001] The invention relates to a turbine engine muffler, in particular to a piezo-electromagnetic rheological muffler used for a marine turbine engine. Background technique [0002] A turbine engine is a form of engine that uses rotating parts to extract kinetic energy from the fluid passing through it, and is often used on large ships. All turbo engines have three major parts: compressor, combustor, and turbine. The incoming airflow is compressed in the compressor into a high-density, high-pressure, low-velocity airflow to increase the efficiency of the engine. After the airflow enters the combustion chamber, fuel is injected from the fuel supply nozzle, mixed with the airflow in the combustion chamber and burned. The high-heat exhaust gas generated after combustion will then drive the turbine to rotate, and then discharge through the exhaust pipe with the remaining energy. Turbine engine exhaust noise is the main source of noise for large ships, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N1/08F01N1/10F01N5/04H02N2/18
CPCF01N1/082F01N1/10F01N5/04H02N2/186Y02T10/12
Inventor 孟国连王鸿云赵爽毕成朱俊华
Owner ZHEJIANG NORMAL UNIVERSITY
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