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气动稳定性
相关语句
  aerodynamic stability
    A 3D AERODYNAMIC STABILITY ACTIVE CONTROL MODEL FOR AXIAL FLOW COMPRESSOR
    轴流压气机三维气动稳定性及主动控制模型
短句来源
    A new three-dimensional aerodynamic stability model for an axial flow compressor to study the effects of radial disturbance on the rotating stall is presented.
    给出了考虑压气机径向扰动对失速影响的轴流压气机三维气动稳定性模型。
短句来源
    Based on the 3D aerodynamic stability model,the related active control technique and the open-loop transfer function have been provided,in which the three dimensional flow effects are involved.
    在轴流压气机三维气动稳定性模型的基础上,给出了考虑轴流压气机三维效应的主动控制模型及其传递函数。
短句来源
    The qualitative considerations about aerodynamic stability for various EFP forms are proposed.
    对各种不同EFP型式的气动稳定性提出了定性估计的方法;
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  aerodynamic stability
The results show that central-slotting can not always improve the aerodynamic stability of bridge structure.
      
Study of the aerodynamic stability of a blunt cone with a side flap in a hypersonic flow
      
It was also found that the severe decrease in the aerodynamic stability was due to the nonlinear effects.
      
Therefore, the nonlinear factors should be considered accurately in aerodynamic stability analysis of long-span suspension bridges during erection.
      
Aerodynamic stability of cable-supported bridges using CFRP cables
      
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Experiments on a square-sertion cylinder fixed and forced to oscillate transversely in uniform stream were conducted in a water tank. The Reynolds number of the experiments is in the range 3·103 to 104, the amplitude to side length ratio A/D is up to 0.7 and the range of reduced velocity 4.5≤Vt≤12.This study aims at investigating the lock-in phenomenon, fluctuating lift and the phase shift between fluctuating lift and displacement of the oscillating cylinder. The problems on the aeroelastic instability relating...

Experiments on a square-sertion cylinder fixed and forced to oscillate transversely in uniform stream were conducted in a water tank. The Reynolds number of the experiments is in the range 3·103 to 104, the amplitude to side length ratio A/D is up to 0.7 and the range of reduced velocity 4.5≤Vt≤12.This study aims at investigating the lock-in phenomenon, fluctuating lift and the phase shift between fluctuating lift and displacement of the oscillating cylinder. The problems on the aeroelastic instability relating to present experimental results have been discussed. The flow visualization clearly shows that there are drastic changes of vortex-shedding from cylinder passing through the resonance point and the upper end of the lock-in range. The results of the flow visualization can help us understand the physical mechanism of the phase shift.

本文对均匀流中静止方柱和横向强迫振动的方柱进行了实验研究。实验雷诺数范围为 3×10~3~10~4,振幅与柱截面宽度之比 A/D 达到0.7,实验折合速度范围为 4.5≤V_r≤12。文章重点研究了较高振幅振动柱的锁定现象、波动升力与柱位移之间的相位变化,讨论了方柱涡激振荡、驰振和气动稳定性问题。对流场进行的流动显示,清晰地显示出锁定区涡脱落过程、近尾迹流场随振动频率和振幅的演化规律,从而对振动柱波动升力与相位变化的物理机制获得进一步认识。

Three dimensional unsteady supersonic and hypersonic flow around a blount body has been computed by solving Euler equations. The unsteady Euler eqautions have been derived for the flow relative motion with respect to a frame of reference that is rigidly attached to the moving body. The equations are cast in curvilinear coordinates and the timeaccurate solution is computed by flux-vector splitting method and Warming-Beam upwind scheme. The dynamic stability derivatives have also been predicted by using the results...

Three dimensional unsteady supersonic and hypersonic flow around a blount body has been computed by solving Euler equations. The unsteady Euler eqautions have been derived for the flow relative motion with respect to a frame of reference that is rigidly attached to the moving body. The equations are cast in curvilinear coordinates and the timeaccurate solution is computed by flux-vector splitting method and Warming-Beam upwind scheme. The dynamic stability derivatives have also been predicted by using the results of the unsteady flow computations. The damping derivatives agree well with existing experimental data. The numerical examples show that the computational method is robust, accurate and effective.

对于钝头体的三维高超音速和超音速非定常绕流,给出了Euler方程在团结于钝头体 的非惯性坐标系中的守恒形式,通过对求解域的有限体积离散,矢通量分裂方法以及Warming 和Beam的二阶迎风格式用数值方法计算了Euler方程的时间精确解。给出了利用本文的非定 常流动数值计算结果及1992年任玉新的学位论文“气动稳定性导数的理论与数值方法”计算出 的俯仰阻尼导数的值,它与实验结果较好地符合。表明文中的非定常流动数值计算方法是可靠 的,对准确确定飞行器的动导数具有意义。

A new three-dimensional aerodynamic stability model for an axial flow compressor to study the effects of radial disturbance on the rotating stall is presented.The calculated results show that the stalling characteristics of the compressor is closely related with its cascade characteristics including total pressure rise versus the flow rate and inlet flow angle.Based on the 3D aerodynamic stability model,the related active control technique and the open-loop transfer function have been provided,in which the three...

A new three-dimensional aerodynamic stability model for an axial flow compressor to study the effects of radial disturbance on the rotating stall is presented.The calculated results show that the stalling characteristics of the compressor is closely related with its cascade characteristics including total pressure rise versus the flow rate and inlet flow angle.Based on the 3D aerodynamic stability model,the related active control technique and the open-loop transfer function have been provided,in which the three dimensional flow effects are involved.The response analyses of the open loop systems for the 3D stability active control model with step impulse were conducted in different flow ranges.

给出了考虑压气机径向扰动对失速影响的轴流压气机三维气动稳定性模型。计算结果表明压气机的失速特性与压气机基元叶栅特性密切相关。在轴流压气机三维气动稳定性模型的基础上,给出了考虑轴流压气机三维效应的主动控制模型及其传递函数。并在阶跃输入情况下,对轴流压气机二维和三维主动控制模型的开环系统在频域进行了响应分析

 
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