Experimental investigation on friction and wear characteristics of brush seal bristle
Two brush seal friction coefficient experimental identification models were established based on cylindrical circumferential friction,direct force measurement and indirect torque method,an experimental device for friction and wear characteristics of brush seals was designed and built,and eight brush seal test pieces with different structural parameters were designed and processed.The experimental results of two kinds of friction coefficient identification models were compared and analyzed,and the influence of structural parameters on the positive pressure of the brush bristle and rotor surface,the influence of working conditions on the friction coefficient of the brush bristle,and the influence of interference on the wear of the brush bristle were studied.The research results showed that the friction coefficients of brush bristle measured by the direct force measurement method and the indirect torque method were less different from each other,and the stability of the direct force measurement method was better than that of the indirect torque method.Both the static and dynamic positive pressures on the surface of the brush seal and the rotor increased with the increase of the protection height of the baffle,decreased with the increase of the radial length of the brush,and increased with the increase of the thickness of the brush pack;at the same interference under the condition of measurement,the static positive pressure was greater than the dynamic positive pressure;the positive pressure of the brush seal filament and the rotor surface was greater in the interference loading phase than in the interference unloading phase,and the speed increase phase was greater than the speed reduction phase,the brush filament exhibited a hysteresis effect.The friction coefficient of the brush seal bristle decreased with the increase of the interference between the brush bristle and the rotor,and also decreased with the increase of the rotor speed;with the increase of the friction time,the friction coefficient decreased rapidly at the initial stage of wear,and then kept basically stable.The wear amount of the brush bristle of the brush seal increased with the increase of the interference between the brush bristle and the rotor.When the interference between the brush bristle and the rotor increased from 0.3 mm to 0.4 mm,the wear amount of the brush bristle increased by 296.66％.
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