Propeller aircraft polar curve determination method

By introducing a thrust coefficient term into the polar curve model of a propeller aircraft, a universal polar curve model applicable to different flight conditions is established, which solves the problem of deviation in the flight performance evaluation results of propeller aircraft and enables more accurate performance calculations and design improvements.

CN115879226BActive Publication Date: 2026-05-01XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Patent Information

Application Number
CN202211687762.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-27
Publication Date
2026-05-01
Estimated Expiration
2042-12-27

AI Technical Summary

Technical Problem

In the existing technology, the calculation of polar curves for propeller aircraft under different flight conditions varies greatly, resulting in deviations in flight performance evaluation results and making it difficult to effectively guide design and improvement.

Method used

A thrust coefficient term is introduced into the polar curve model of a propeller aircraft to characterize the influence of propeller slipstream on the drag coefficient. A general polar curve model applicable to cruise, climb, and descent states is established, and the general polar curve expression is obtained by fitting flight data using the least squares method.

Benefits of technology

It improves the accuracy and efficiency of flight performance calculations for propeller-driven aircraft, providing effective guidance for rapid iteration in design and improvement.

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Abstract

The application provides a propeller aircraft polar curve determination method, introduces a tension coefficient term in a general propeller aircraft polar curve model, represents the influence of propeller slipstream on the resistance coefficient, establishes a general polar curve model which can be simultaneously applied to the cruising, climbing and descending states of the propeller aircraft, and then determines the expression of the general polar curve model by using the cruising, climbing and descending test flight data of the propeller aircraft, so that the same configuration can be simultaneously applied to the flight performance expansion calculation of the propeller aircraft in different flight states, the efficiency and accuracy of the propeller flight performance calculation can be improved, and effective guidance can be provided for the rapid iteration of the design and improvement of the propeller aircraft.
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