Fluid machine with plasma actuator

Abstract

A fluid machine includes a rotary blade, a casing configured to house the rotary blade therein, and an insulation coated conductor attached within a recess circumferentially provided in an inner circumference of the casing opposed to an outer end of the rotary blade, the insulation coated conductor including a conductive wire and an insulation material coating. The dielectric barrier discharge is generated between the insulation coated conductor and the outer end of the rotary blade by applying a pulse voltage between the conductive wire and the rotary blade, so as to prevent leakage of operative fluid through a tip clearance between the inner circumference of the casing and the outer end of the rotary blade.

1 . A fluid machine, comprising:
 a rotary blade;   a casing configured to house the rotary blade therein; and   an insulation coated conductor attached within a recess circumferentially provided in an inner circumference of the casing opposed to an outer end of the rotary blade, the insulation coated conductor including a conductive wire and an insulation material coating, wherein   dielectric barrier discharge is generated between the insulation coated conductor and the outer end of the rotary blade by applying a pulse voltage between the conductive wire and the rotary blade, so as to prevent leakage of operative fluid through a tip clearance between the inner circumference of the casing and the outer end of the rotary blade.   
     
     
         2 . The fluid machine according to  claim 1 , wherein the insulation coated conductor is flexibly attachable to a three-dimensional shape of the inner circumference of the casing. 
     
     
         3 . The fluid machine according to  claim 1 , wherein the insulation coated conductor is in contact with an inner surface of the recess. 
     
     
         4 . The fluid machine according to  claim 3 , wherein the insulation coated conductor is flexibly attachable to a three-dimensional shape of the inner circumference of the casing. 
     
     
         5 . The fluid machine according to  claim 1 , further comprising an insulation guide attached within the recess and configured to cover the insulation coated conductor. 
     
     
         6 . The fluid machine according to  claim 5 , wherein the insulation guide and the insulation coated conductor are integrated by a heat resistant fine ceramic. 
     
     
         7 . The fluid machine according to  claim 1 , wherein a circumferential shape of the outer end of the rotary blade opposed to the inner circumference of the casing is configured such that the dielectric barrier discharge is generated uniformly along a circumferential direction of the outer end of the rotary blade. 
     
     
         8 . The fluid machine according to  claim 1 , wherein
 the insulation coated conductor includes a plurality of discrete insulation coated conductors aligned in an axial direction, and   each of the plurality of discrete insulation coated conductors is configured to be driven by an individual voltage value and frequency of the pulse voltage.