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Calculation method of internal resistance of engine nacelle

An engine nacelle, internal resistance technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problems of inability to fully account for far-field influence and pressure difference resistance loss, small value, etc., to save research and development costs , the effect of reducing the number of trips and high accuracy

Inactive Publication Date: 2016-05-11
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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AI Technical Summary

Problems solved by technology

[0006] The conventional numerical calculation method uses the surface resistance integral, which cannot fully take into account the far-field influence and the pressure difference resistance loss, and the value is too small

Method used

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  • Calculation method of internal resistance of engine nacelle
  • Calculation method of internal resistance of engine nacelle
  • Calculation method of internal resistance of engine nacelle

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Experimental program
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Embodiment Construction

[0020] 1. A calculation method for engine nacelle internal resistance, comprising the following steps:

[0021] 1) Carry out numerical calculation of the flow field for the design configuration with ventilated nacelle, and obtain the full flow field data of the aircraft under simulated working conditions. , and divide the interpolation grid of this section;

[0022] 2) Obtain the flow field information on the interpolation grid, including density ρ i,j , speed v i,j , static pressure p i,j ;

[0023] 3) Calculate the internal resistance of the ventilated nacelle

[0024] It is stipulated that the flow field information at the outlet section of the ventilated nacelle is marked by the number 1, and the flow field information of the far-field free flow is marked by ∞, then the formula for estimating the internal resistance of the inlet is:

[0025] D N = m ‾ v 1 ...

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Abstract

The invention provides a calculation method of the internal resistance of an engine nacelle. The calculation method is characterized by comprising the following steps: 1) carrying out flow field numerical value calculation on a design configuration provided with a ventilation nacelle to obtain the total flow field data of an airplane under a simulation working condition, requiring to define a profile on the exit position of the ventilation nacelle when a numerical value computational grid of the design configuration is constructed, and dividing the interpolation grid of the profile; 2) obtaining flow field information on the interpolation grid, wherein the flow field information comprises density [Rho]i, j, speed Vi, j, and static pressure Pi,j; and 3) calculating the internal resistance of the ventilation nacelle.

Description

Technical field: [0001] The invention provides the field of aircraft aerodynamic design test. Background technique: [0002] At present, the internal resistance of the ventilated nacelle is usually calculated by the wind tunnel test method or the gauge value calculation method, but there are problems in both. [0003] 1) Wind tunnel test method for measuring the internal resistance of the ventilated nacelle: [0004] In the wind tunnel test, the internal resistance of the ventilated nacelle is usually measured by the pressure measuring rake to measure the total pressure and static pressure at the outlet. The specific operation is to extend the rake with the pressure measuring probe from the rear of the ventilation nacelle to the outlet of the nacelle, so as to obtain the airflow parameters at the outlet of the nacelle. The disadvantage of this method is that it will interfere with the airflow in the intake port and affect the measurement of the aerodynamic force of the who...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 武宁李权冯海勇
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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