A computational method for rotary wing airloading calculation called the local circulation method (LCM) has been extended to a counter rotation propeller (CRP). The new method is a combination of LCM for single rotor and a coaxial helicopter rotor model used in the local momentum theory (LMT) with some modifications. The interaction of two rotors via swirl velocity is introduced in addition to axial induced velocity. Results are compared with those of experiment for subsonic CRP performance and showed a good agreement. It is applied to transonic propeller employing experimental two-dimensional lift slope data at high Mach number. It also resulted in a good agreement with Euler calculation in single rotation advanced turbo-prop (ATP). Some results of calculation are given both for performance and time dependent airloading.
Extension of local circulation method to counter rotation propeller
Erweiterung der lokalen Zirkulationsmethode auf gegendrehende Propeller
AIAA-Papers ; Jul ; 1-9
1987
9 Seiten, 16 Bilder, 15 Quellen
Conference paper
English
Performance calculation of counter rotation propeller
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