The measuring of coaxial contra rotating propellers with different diameters and design points

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F21%3A00353186" target="_blank" >RIV/68407700:21220/21:00353186 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

The measuring of coaxial contra rotating propellers with different diameters and design points

Original language description

This paper is focused on measuring static characteristics of two coaxial contra rotating propellers (CRP). This particular measuring is a part of the complete design of the UAV VTOL tailsitter aircraft, which is developed at The Institute of Fluid Mechanics and Thermodynamics of the Faculty of Mechanical Engineering of the Czech Technical University. The measurement target is to verify correctness of the numerical design method used for measured propellers and then to find the data necessary for maximalization of the power efficiency of the designed UAV. The specificity of measured CRP is a different diameter of the propellers and a different design point. The bigger 22’’ propeller is designed to provide sufficient thrust for vertical take-off and landing. The smaller one, 16’’ propeller, is optimized for a horizontal flight with constant speed, however it contributes to achieve sufficient thrust in a vertical position as well. In both cases the propellers take the same position in the space and therefore the same position relatively to each other. The first part of the measurement is focused on measuring static characteristics of each propeller separately. The measured data was compared with the design static characteristics calculated with 3D panel method, thus the accuracy of used numerical design method was determined. In the following part of the measurement, the propellers were integrated in the aircraft and all measurements were repeated. In this configuration it is possible to determine thrust losses caused by the aircraft body. Another important point of measurement is to determinate optimal propeller rpm ratio for the lowest possible power consumption and propeller rpm ratio when the final torque on a propeller axis is zero. This data is essential for subsequent tuning of the autopilot unit.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20302 - Applied mechanics

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of Abstracts 39th Meeting of Departments of Fluid Mechanics and Thermodynamic

ISBN

978-80-248-4557-9

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

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Publisher name

VŠB - Technical University of Ostrava

Place of publication

Ostrava

Event location

Hotel Duo, Horní Bečva

Event date

Oct 13, 2021

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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