| Citation: | YANG Yixiao, SUN Dan, ZHAO Huan, et al. Numerical study on hysteresis effect and blow down effect of improved brush seal structure with through hole on backing plate[J]. Journal of Aerospace Power, 2025, 40（2）：20230143 doi: 10.13224/j.cnki.jasp.20230143
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A improved brush seal structure with through hole on backing plate structure was presented, and a three-dimensional numerical calculation model for the flow field characteristics of the improved brush seal structure with through hole on backing plate was established. The flow field pressure distribution characteristics of the traditional and improved brush seals were compared and analyzed, and the influence laws of the structure parameters and operating parameters on the hysteresis and blow-down effects of the improved brush seal were studied. The research results showed that the brush seal with through hole on backing plate structure can effectively suppress the hysteresis and blow-down effects. Increasing the number and diameter of through hole on backing plate can improve the inhibition of hysteresis and blow-down effects. With the increase of inlet and outlet pressure ratio, the inhibition of brush seal with through hole on backing plate on hysteresis effect increased, and the inhibition of blow-down effect decreased. Under the pressure ratio range of 1.5 to 3.0, compared with pressure balanced chamber brush seal, the steady-state leakage of the modified structure increased by 11.2% to 15.4%, and compared with pressure relief chamber brush seal, the steady-state leakage of the modified structure decreased by 58.3% to 66.7%, inhibition of hysteresis effect performance was similar to pressure relief chamber brush seal and the sealing performance was improved. Three rows of pressure relief hole arrays uniformly distributed along the radial and circumferential directions were arranged on the backing plate, compared with basic brush seal, the dimensionless pressure coefficient of the downstream surface of the bristle was reduced by 85.0% to 88.9%, the pressure at the contact position between the downstream surface of the bristle and backing plate decreased significantly, the difference between the dimensionless pressure coefficient of the upper and lower end faces of the bristle was reduced by 75.0% to 96.7%, and the radial pressure difference inside the bristle was significantly reduced. The inhibition of hysteresis and blow-down effects was obvious.
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