Tip clearance

About: Tip clearance is a research topic. Over the lifetime, 2637 publications have been published within this topic receiving 32671 citations.

Internal gear type liquid pressure rotating machine

Abstract: PURPOSE:To improve the volume efficiency by rotatably supporting the partitions, which are provided between an internal gear and a pinion and divided into external and internal sides, and by minimizing each tooth tip clearance by expanding the divided partitions, towrd inner and outer circumferences, with high-pressure liquid CONSTITUTION:Both sides of a fixed partition 4 are respectively provided with circular-arc shaped movable partitions 6 and 6' as well as 7 and 7' being divided from the fixed partition 4 and supported rotatably by pins 5 and 5' A high-pressure liquid introducing slot 8 is formed betwen the joint surface of the partitions 6 and 7, and the joint surfaces are furnished with plural number of spring 10 It is same as for partitions 6' and 7' The high-pressure liquid in an oil chamber 9 is introduced into the slot 8 to expand it Therefore, both the clearances between the tooth tip of an internal gear 2 and the partition 6 as wellas between the tooth tip of a pinion 3 and the partition 7 can be controlled to a minimum

Rotor tip clearance effects on overall and blade-element performance of axial-flow transonic fan stage

Abstract: The effects of tip clearance on the overall and blade-element performance of an axial-flow transonic fan stage are presented. The 50-centimeter-diameter fan was tested at four tip clearances (nonrotating) from 0.061 to 0.178 centimeter. The calculated radial growth of the blades was 0.040 centimeter at design conditions. The decrease in overall stage performance with increasing clearance is attributed to the loss in rotor performance. For the rotor the effects of clearance on performance parameters extended to about 70 percent of blade span from the tip. The stage still margin based on an assumed operating line decreased from 15.3 to 0 percent as the clearance increased from 0.061 to 0.178 centimeter.

Effects of leakage vortex on aerodynamic performance and loss mechanism of steam turbine

Abstract: To avoid friction, a clearance between the rotor blade tip and the cylinder is needed in a steam turbine. As a result, the leakage flow is formed under the pressure difference which mixes with the ...

Blade and sealing mechanism for moving blade

Abstract: PROBLEM TO BE SOLVED: To improve the efficiency of a rotary machine by always maintaining a chip clearance at zero or minimum for the tip part of a fin and the inner peripheral surface of a sealing member by adjusting a spring elastic force and reducing the leakage of gas from a tip clearance part. SOLUTION: A fin 3 is formed in a reverse T shape, a base part 3b thereof is housed in a hollow part 2a, and a tip part 3a is protruded from a hole 2a in the outer periphery of a shroud 2 in a radial direction and is brought into contact with the inner surface of a honeycomb seal 6 as a sealing member. A compression spring 4 is erected between the upper and lower surfaces of the base part 3b of the fin 3 and between the upper and lower wall surfaces of the hollow part 2a. The tip 3a of the fin 3 is brought into contact with the inner peripheral surface of the honeycomb seal 6 with a small force by the elastic force of the spring 4. By adjusting the spring constant of the spring 4 and an attaching load for the pressing force of the fin 3, the tip 3a of the fin 3 is brought into contact with the inner peripheral surface of the honeycomb seal 6, i.e., a honeycomb end edge 6a, always by a small force.