| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved rotation propulsion blade attached to a rotor rotating in a duct and capable of obtaining large thrust. SOLUTION: The blades attached onto a circumferential face 3a of the rotor 3 rotating in the duct 1 includes a hole having blade 5 provided with a hole 9 on a blade face and a blade 7 having no hole 9. The hole having blades 5A, 5B, 5C and the blades having no hole 7A, 7B, 7C are alternately arranged along the direction of rotation. Each set G1, G2, G3 is formed by one hole having blade 5 and the blades 7 having no hole adjacent to it on its both sides to form a region A on a flow-in side and a region B on an injection side of each set each. Air stream S flowing into the duct 1 is injected to the outside of the hole 9 as jet air stream J1 because the air stream S flows out of the narrow hole 9 in the hole having blade 5. On the other hand, the air stream S hits the blade having no hole, remains in it, and becomes large capacity stream K in a region B because the blade having no hole acts as a bulkhead. Since the jet air stream J1 flowing out of the hole 9 involves the large capacity stream K in the region B when passing through the region B, large jet air stream J2 is formed on the whole and is injected to the outside of the duct 1. COPYRIGHT: (C)2006,JPO&NCIPI
|
