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偏流速度
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  drift rate
It has a high resonance frequency (>amp;gt;30 kHz) and a small thermal-drift rate (≤1 nm/°C) at room temperature.
      
The reduction in whistler group velocity inside inhomogeneities to 760 km s-1 may be responsible for the unusually low drift rate of the narrow fibers.
      
There is an abrupt retardation of the drift at latitudes of 30°-50°, and a stagnation region where the drift rate does not exceed several meters per second arises.
      
The drift rate of the lower boundary is -1 to -2 deg/yr, a factor of two to three smaller in magnitude than the corresponding solar value.
      
A drift in the radial velocity of the central component is observed (VLSR=-60 km/s) with a drift rate of about 0.09 km/s per year.
      
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The effect of grazingbias flow interaction on the orifice acoustic impedance has been experimentally investigated.It is shown that the acoustic resistance of an orifice increases slowly with the increase of bias flow speed because of grazing flow effect,but the acoustic resistance is dominated by the bias flow effect when bias flow speed is comparatively high.In addition,there is some difference between grazinginflow and grazingoutflow interactions.Finally, an attempt is made to correlate the experimental...

The effect of grazingbias flow interaction on the orifice acoustic impedance has been experimentally investigated.It is shown that the acoustic resistance of an orifice increases slowly with the increase of bias flow speed because of grazing flow effect,but the acoustic resistance is dominated by the bias flow effect when bias flow speed is comparatively high.In addition,there is some difference between grazinginflow and grazingoutflow interactions.Finally, an attempt is made to correlate the experimental data in terms of the effective discharge coefficient.

对切向流和偏流相互干扰如何影响穿孔板声阻抗进行了细致的实验研究,结果表明:切向流削弱了偏流对穿孔板声阻的调控,但在较高偏流速度下,偏流对穿孔板声阻的影响仍起主导作用;此外,不同的偏流方式(吹气或吸气)与切向流干扰对穿孔板声阻抗的影响有明显区别。最后,尝试通过有效流量系数把不同实验条件下的数据关联起来。

A perforated liner is widely used in the suppression of noise, elimination of combustion instability of reduction of acoustic fatigue. In the present paper, a discrete-vortex model is employed to study nonlinear acoustic properties of an orifice. Compared with the previous models, the present model has the advantage of considering the effect of grazing flow with high sound pressure level and taking the detailed vortex motion around an orifice into account. For a consinoidal sound pressure, the time-history of...

A perforated liner is widely used in the suppression of noise, elimination of combustion instability of reduction of acoustic fatigue. In the present paper, a discrete-vortex model is employed to study nonlinear acoustic properties of an orifice. Compared with the previous models, the present model has the advantage of considering the effect of grazing flow with high sound pressure level and taking the detailed vortex motion around an orifice into account. For a consinoidal sound pressure, the time-history of the average velocity though the orifice is computed, and the nonlinear distortion of the velocity is examined by means of the Fourier decomposition. In addition, some experimental investigations are carried on to investigate the nonlinear acoustic properties of an orifice. The comparison between the theoretical and experimental results is also presented in this paper.

流过声衬表面的切向流和高声压级的声场对于穿孔板共振结构的声学特性有这非常显著的影响。本文从波涡相互作用机制出发,发展了一种旨在研究矩形穿孔板在切向流条件下非线性效应的离散涡模型。同时用双传声器法测量了不同几何参数的穿孔板的声阻抗随偏流速度及声压级的变化情况。将本文的实验与理论结果进行了对比分析,对比的结果表明本文的实验与理论结果符合良好。

 
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