Open rotor blading

Details Open rotor blading Open rotor blading

1989-07-12

1990-11-13

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Cantilever blade

416DIG2, 416DIG5, B64C 1116

Patent

active

049698001

ABSTRACT:
To reduce the noise levels of open rotor devices rotating at supersonic tip speeds, a combination of blade sweep and aerofoil profile is employed. The sweep of the blade extends through the sonic radius, and in the region of the sonic radius the section comprises a leading edge profile with a rounded nose conforming essentially to the formula

REFERENCES:
patent: 4073601 (1978-02-01), Kress
patent: 4459083 (1984-07-01), Bingham
patent: 4569633 (1986-02-01), Flemming, Jr.
patent: 4652213 (1987-03-01), Thibert et al.
patent: 4773825 (1988-09-01), Rodde et al.
D. B. Hanson, "Helicoidal Surface Theory for Harmonic Noise of Propellers in the Far Field", AIAA Journal, vol. 18, 2/1980, pp. 1213-1220.
F. B. Metzger & C. Rohrbach, "Benefits of Blade Sweep for Advanced Turboprops", AIAA Paper 85-1260, Jul. 1985.
D. B. Hanson, "Influence of Propeller Design Parameters on Far Field Harmonic Noise in Forward Flight", AIAA Journal, vol. 18, 5/1980, pp. 1313-1319.
C. K. W. Tam, "On Linear Acoustic Solutions of High Speed Helicopter Impulsive Noise Problems", Journal Sound & Vib., vol. 89(1), pp. 119-134, Sep. 1982.

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