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冲击单音
相关语句
  impinging tone
     Vortex structure and impinging tone in high-speed impinging jet
     高速冲击射流中的涡结构和冲击单音
短句来源
     The results show that the impinging tone dominates the discrete frequency noise with short impinging distances.
     结果表明:对于凹、凸、平三种形状的冲击面,当冲击距离较小时,冲击单音主导了离散频率噪声;
短句来源
     In this paper,vortex structures and flow patterns are studied by PIV(Particle Image Velocimetry) technology. The relationship between flow field and acoustic filed is obtained. It found that the existence and intensity of the vortex structure varied with different pressure ratio,impinging distance and nozzle lip thickness were similar to the impinging tone did.
     采用PIV(粒子图像测速)技术对高速冲击射流的流场结构和涡结构进行深入研究,探讨流场与声场的相关性,发现冲击单音的存在与否及强弱与涡结构的存在与否及强弱大小相对应,且冲击单音随压比、冲击距离、喷嘴唇厚等参数变化的规律也与涡结构与这些因素的变化规律相一致,因此涡结构和冲击单音具有很强的相关性;
短句来源
     When Mach disk forms in the flow field, the oscillation will only exist between Mach disk and impinging plate. At the same time, impinging tone with discrete frequency will be decreased and even be diminished. From this point, it can be deduced that Mach disk can restrain the formation of feedback loop for discrete frequency impinging tone.
     本文利用纹影方法和高速摄影得到了高速冲击射流在不同压比下的流场结构,发现在马赫盘出现之前,冲击射流的流场是整体振荡的:而马赫盘出现之后,冲击射流的流场振荡局限于马赫盘与冲击平板之间,且此时的离散频率的冲击单音也明显减弱甚至消火,这意味着马赫盘的形成可一定程度地抑止反馈环的形成。
     There are different impinging tone frequencies corresponding to helical and symmetric flow pattern.
     并且螺旋模态与对称模态对应不同频率的冲击单音,在同一工况下可能存在两种流动模态共存的情况,此时冲击单音也具有多频率特性。
短句来源
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  相似匹配句对
     The Shock of Photograph
     影像的冲击
短句来源
     Culture Shock
     文化冲击
短句来源
     Vortex structure and impinging tone in high-speed impinging jet
     高速冲击射流中的涡结构和冲击单音
短句来源
     The frequency of the strongest impinging tone changes in discrete steps as the nozzle pressure ratio (NPR) increases.
     冲击单音最强音的频率随压比增大呈现频级阶越的现象;
短句来源
     REMARK ON MONOSYLLABIC VERBS OF LAOZI
     浅谈《老子》单音动词
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In the paper, flow structures at different pressure ratios are obtained by Schlieren image and high speed camera. It is found that the whole flow field is oscillating at lower pressure ratio. When Mach disk forms in the flow field, the oscillation will only exist between Mach disk and impinging plate. At the same time, impinging tone with discrete frequency will be decreased and even be diminished. From this point, it can be deduced that Mach disk can restrain the formation of feedback loop for discrete...

In the paper, flow structures at different pressure ratios are obtained by Schlieren image and high speed camera. It is found that the whole flow field is oscillating at lower pressure ratio. When Mach disk forms in the flow field, the oscillation will only exist between Mach disk and impinging plate. At the same time, impinging tone with discrete frequency will be decreased and even be diminished. From this point, it can be deduced that Mach disk can restrain the formation of feedback loop for discrete frequency impinging tone.

利用纹影方法和高速摄影得到了高速冲击射流在不同压比下的流场结构,发现在马赫盘出现之前,冲击射流的流场是整体振荡的;而马赫盘出现之后,冲击射流的流场振荡局限于马赫盘与冲击平板之间,且此时离散频率的冲击单音也明显减弱甚至消失,这意味着马赫盘的形成可一定程度地抑止反馈环的形成。

To investigate the relationship between the flow field oscillation of an under-expanded supersonic impinging jet with its nozzle pressure ratio (NPR), numerical simulation with the RSM model was applied to symmetrical impinging jet. The results show that the flow field oscillation is relevant to the NPR. The amplitude of the oscillation augments with the increasing NPR, which reaches its maximum on a critical pressure ratio. However, the amplitude reduces as the NPR goes on increasing. The variation of the flow...

To investigate the relationship between the flow field oscillation of an under-expanded supersonic impinging jet with its nozzle pressure ratio (NPR), numerical simulation with the RSM model was applied to symmetrical impinging jet. The results show that the flow field oscillation is relevant to the NPR. The amplitude of the oscillation augments with the increasing NPR, which reaches its maximum on a critical pressure ratio. However, the amplitude reduces as the NPR goes on increasing. The variation of the flow field oscillation with the increasing NPR is similar to that of the impinging tone strength, which illuminates the impinging tone is correlative with the flow field oscillation.

为了研究超声速欠膨胀冲击射流自激振荡与喷嘴进出口压比的关系,对轴对称冲击射流进行了数值模拟,计算中采用了雷诺应力模型。结果发现:当喷嘴压比较小时,流场振荡随喷嘴压比的增大而加剧。当压比处于某一范围内时,流场振幅最大,振荡最剧烈。随着压比的继续增大,流场振幅又减小。流场振幅随喷嘴压比的变化与冲击单音强度随喷嘴进出口压比的变化相似,说明流场振荡与冲击单音有内在的关联。

The noise of impinging jets plays an important role in designs to reduce sonic fatigue in short take-off and vertical landing (STOVL) aircraft. Far-field noise characteristics of impinging jets on concave, convex, and plane plates were analyzed using fast Fourier transform. The results show that the impinging tone dominates the discrete frequency noise with short impinging distances. The frequency of the strongest impinging tone changes in discrete steps as the nozzle pressure ratio (NPR) increases. Far-field...

The noise of impinging jets plays an important role in designs to reduce sonic fatigue in short take-off and vertical landing (STOVL) aircraft. Far-field noise characteristics of impinging jets on concave, convex, and plane plates were analyzed using fast Fourier transform. The results show that the impinging tone dominates the discrete frequency noise with short impinging distances. The frequency of the strongest impinging tone changes in discrete steps as the nozzle pressure ratio (NPR) increases. Far-field acoustic measurements indicate that the overall sound pressure levels (OASPL) logarithmically increase with the NPR which means that this increase is relatively insensitive to variations in the NPR for NPR larger than 2.5. For a jet impinging onto a concave plate, the OASPL of the far-field noise is quite sensitive to position variations of the nozzle.

冲击射流噪声研究可为减轻垂直起降型飞机的声致疲劳提供思路。用快速Fourier变换得到了不同形状冲击面条件下冲击射流的远场噪声,并分析了噪声频谱。结果表明:对于凹、凸、平三种形状的冲击面,当冲击距离较小时,冲击单音主导了离散频率噪声;冲击单音最强音的频率随压比增大呈现频级阶越的现象;射流噪声总声压级随压比成类似对数增长的关系,当喷嘴压比大于2.5后,总声压级随压比的增长趋于缓慢;对于冲击面为凹面的冲击射流,远场噪声总声压级对喷嘴位置改变非常敏感。

 
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