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README.md 2.98 KiB

Rotor database

This repo contains a list of rotor geometries and the associated experimental data. All these data were found in articles, technical reports, theses, etc. The reference is always listed alongside the files.

WARNING

The data from Caradonna is taken as it is presented in the tables. Upon closer inspection, it seems that there is some errors for the sectional lift coefficient.

Organization

Every entry comes with at least two csv files:

  • <rotor_name>_geom.csv contains the geometric parameters of the rotor
  • <rotor_name>_data.csv contains the experimental measurements

General file info

All files start with some commented lines (i.e., lines starting with #). These comments indicate

  • the origin of the data
  • "tags" to quickly identify topics of interest with grep or similar tools
  • the units of the columns

The available tags are compiled in the following table

Tag Description
hover Hovering helicopter
axial Helicopter in axial climb/descent
oblique Oblique flows (e.g., helicopter in forward flight)
coaxial Coaxial rotors
propeller Aircraft propeller
incomplete Incomplete datasets (no all data in reproduced in the csv)

Geometry files

The geometry files are standardized so they all share the same formatting, columns order, etc. They are also all given in SI units.

The columns represent the different parameters, while the rows give the values of these parameters in some specific blade sections. This means that the first data always corresponds to the section at the blade root cutout, while the last data corresponds to the section at blade tip.

Data files

The data files reflect the available information in the source material. It is currently not planned to standardize them, so each file should be scrutinized properly before usage in your codes. The data are presented in their original units, so use it with caution.

Scripts

Small scripts/functions will be provided in the future in the scripts/ directory to help you load and parse the data in the most common languages.

Contributing

Any contribution to this database is more than welcomed. A small python script will be provided shortly to streamline the generation of the geometry file.

List of rotors

  • Knight1937: Knight & Hefner, Static Thrust Analysis of the Lifting Airscrew, 1937 (NACA-TN-626).
  • Caradonna1981: Caradonna & Tung, Experimental and Analytical Studies of a Mode Helicopter Rotor in Hover, 1981 (NASA-TM-81232).
  • Landgrebe1971: Landgrebe, An Analytical and Experimental Investigation of Helicopter Rotor Hover Performance and Wake Geometry Characteristics, 1971 (USAAMRDL-TR-71-24).