Impeller type centrifugal ventilator resistance calculation method

Abstract

The invention provides an impeller type centrifugal ventilator resistance calculation method, which comprises the following steps: determining the arrangement of impeller units and aperture units of an impeller type centrifugal ventilator according to the structural form of the impeller type centrifugal ventilator and the flow direction of airflow flowing through the impeller type centrifugal ventilator, and constructing a network framework of resistance characteristic units; determining parameter values of the corresponding resistance characteristic units according to the structure parametersand the operation parameters of the resistance characteristic units; determining the working environment of the impeller type centrifugal ventilator; and calculating the resistance of the impeller units, the resistance of the aperture units, and the overall resistance of the impeller type centrifugal ventilator with the impeller units and the aperture units according to the parameter values in the working environment. According to the method, an impeller type centrifugal ventilator resistance theoretical expression can be directly obtained through network architecture building according to the structural characteristic and size of the impeller type centrifugal ventilator, the calculation method is simple and efficient, and the method can be suitable for resistance calculation under all working conditions.

Description

technical field [0001] The application belongs to the technical field of impeller-type centrifugal ventilators, and in particular relates to a method for calculating resistance of an impeller-type centrifugal ventilator. Background technique [0002] The impeller centrifugal ventilator is the most widely used ventilator in aero-engines, and its resistance characteristic is the most important design index of the lubrication ventilation system. At present, the methods for obtaining the resistance of impeller centrifugal ventilators mainly include simulation analysis method and test fitting method. The simulation analysis method mainly uses computer software to simulate the operating conditions of the impeller centrifugal ventilator to obtain its resistance characteristics. It needs to use CAD software for modeling, mesh division software for mesh division, and CFD software for simulation analysis. The resistance of the impeller centrifugal ventilator at a specific speed and e...

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Problems solved by technology

[0003] However, the simulation analysis method requires steps such as model establishment, meshing and simulation analysis. The calculation process is relatively complicated, the cycle is long, and only discrete points under fixed conditions can be obtained. It requires a lot of manpower and time, and the efficiency is low.

However, the test fitting method measures the resistance value of the ventilator through the test piece on the tester. It needs to invest in the test piece, test equipment and test personnel, and can only obtain discrete resistance points under fixed conditions. The fitting accuracy is closely related to the accuracy of the test equipment, the skills of the test personnel and the selection of test points, the cost is high and the efficiency is low; if the structure of the ventilator changes, the test results will lose their reference value

[0004] At present, in the scheme design stage of the aeroengine lubrication system, it is necessary to calculate and evaluate up to dozens of state points in the typical section of the engine, and it is necessary to continuously adjust and improve the system scheme. The above two methods are costly, long-term and applicable. Poor performance, no longer meet the design requirements of modern engine ventilation system

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