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Method and apparatus for producing fluid pressure and controlling boundary layer

  • US 4,981,414 A
  • Filed: 05/27/1988
  • Issued: 01/01/1991
  • Est. Priority Date: 05/27/1988
  • Status: Expired due to Fees
First Claim
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1. In a blower or pump or the like of the axial flow or mixed flow turbomachine type and having a hub member,a. a plurality of impeller blades mounted on a hub member for rotation,(1) each of said blades having a hub portion, a tip portion, a rounded leading edge and a relatively sharp trailing edge,(2) said blades having a combination of camber and blade solidity wherein, during operation of said blades at the design point,(a) the outlet relative velocity is equal to or greater than 0.6 times the inlet relative velocity at the hub of the impeller,(b) the ratio of the outlet relative velocity to the inlet relative velocity at the hub is greater than at the tip, and(c) the angle of flow deflection within the impeller blades is at least equal to approximately 50°

  • or more, at one location within the impeller,b. a plurality of stationary guide vanes located downstream from said impeller blades and through which flows the entire flow discharge by the impeller blades,(1) each of said guide vanes including at least a forward row and an aft row of blades,(2) the chord of each of the blades in the aft row being greater than the chord of each of the blades in the forward row,(3) said blades in the aft row cooperating with said blades in the forward row to form during operation of the blower or pump, multiple rows of blades, and(4) each of said guide vanes having a combination of camber and blade solidity wherein the direction of discharge from said impeller blades is turned by said guide vanes back to the direction of entry of said flow into said impeller blades while the absolute flow through said stationary guide vanes undergoes a substantial flow deceleration wherein the ratio of the axial through flow velocity to the outlet velocity from the impeller blades equals approximately 0.66 or less at the hub location, andc. the pressure coefficient for said blower or pump is equal to at least 1.0 or more.

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