Cylindrical blades for axial steam turbines
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0170644
(2002-06-14)
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발명자
/ 주소 |
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출원인 / 주소 |
- Bharat Heavy Electricals Ltd.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
1 |
초록
▼
This invention relates an improved cylindrical blades for axial steam turbines comprising a leading edge and a trailing edge and a pressure face and a suction face and an inlet flow angle and an outflow flow angle at the leading edge and trailing edge respectively characterized in that the blades fo
This invention relates an improved cylindrical blades for axial steam turbines comprising a leading edge and a trailing edge and a pressure face and a suction face and an inlet flow angle and an outflow flow angle at the leading edge and trailing edge respectively characterized in that the blades formed by setting angle variation for incompressible flow as well as at subsonic Mach numbers at the exit with a lower loss for a range of stagger angles.
대표청구항
▼
1. Improved cylindrical blades for axial steam turbines comprising a leading edge and a trailing edge, a pressure face and suction face, and an inlet flow angle and an outflow angle at the leading edge and trailing edge respectively characterized in that the blades formed by setting angle variation
1. Improved cylindrical blades for axial steam turbines comprising a leading edge and a trailing edge, a pressure face and suction face, and an inlet flow angle and an outflow angle at the leading edge and trailing edge respectively characterized in that the blades formed by setting angle variation in a range of 47-57 degrees for incompressible flows as and at a subsonic Mach number at <0.8 with a lower loss at a stagger angle of 57 degrees, wherein the blade or profile is set at an angle betabi or y, tg as stagger or setting angle with respect to U-axis and is defined as a profile length joining the leading edge to the trailing edge.2. The improved cylindrical blades for axial steam turbines as claimed in claim 1 wherein the effectiveness factor (ξ) with reference to the reference profile is 0.3 and 0.6% for a stagger angle of 57 and 47 degrees (incompressible flow), ξ=1.4 and 1.8% for high Mach number (0.8).3. The improved cylindrical blades for axial steam turbines as claimed in claim 1 wherein the profile thickness value as 28% of chord located at 22% of chord distance from the leading edge in geometrical ratios areD/L=0.277, d1/L=0.096 d2/L=0.014, A/(D*L)=0.612 b1/L=0.409, 11/L=0.2615 b2/L=0.1795 12/L=0.452, b4/L=0.230 b3/L=0.2625, 13/L=0.220 b5/L=0.014. 4. An improved cylindrical blade for axial steam turbines comprising a leading edge and a trailing edge, a pressure face and suction face, and an inlet flow angle and an outflow angle at the leading edge and trailing edge respectively characterized in that the blades formed by setting angle variation in a range of 47-57 degrees for incompressible flows as and at a subsonic Mach number at <0.8 with a lower loss at a stagger angle of 57 degrees wherein the profile thickness and its location are 28% and 22% of chord respectively, has the following geometrical ratios; and loss values:D/L=0.279, d1/L=0.049, d2/L=0.013, A1(D*L)=0.636 b1/L=0.377, 11/L=0.336, b2/L=0.141, 12/L=0.573, b4/L=0.236 b3/L=0.231 13/L=0.281 b5/L=0.006 ξ=0.9 and 3.0% at y tg=57 and 47 degree respectively.5. An improved cylindrical blade as per claim 1, wherein the profile thickness and its location are 28% and 22% of chord respectively, has the following geometrical ratios and loss values:D/L=0.279, d1/L=0.049, d2/L=0.013, A1(D*L)=0.636 b1/L=0.377, 11/L=0.336, b2/L=0.141, 12/L=0.573, b4/L=0.236 b3/L=0.231 13L=0.281 b5/L=0.006 ξ=0.9 and 3.0% at y tg=57 and 47 degrees, respectively.
이 특허에 인용된 특허 (1)
-
Ferleger Jurek (Longwood FL) Cornell Daniel R. (Winter Springs FL), Light weight steam turbine blade.
이 특허를 인용한 특허 (1)
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Grove,Graham Bond, Aerofoil arrangement.
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