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fluctuation pressure fields
相关语句
  脉动压力场
     Experimental Measurement of Fluctuation Pressure fields Induced by High-speed Gas-jets under Water
     水下高速气体射流诱导脉动压力场的实验测量
  相似匹配句对
     Structurevibration and pressure fluctuation;
     动水压力脉动及建筑物的振动;
短句来源
     pressure;
     压力;
短句来源
     Investigation on Wall-Pressure Fluctuation
     脉动壁压深化研究
     The Study on the Pressure
     论压力
短句来源
     Unification of fields
     场的统一
短句来源
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This paper derived a formula for calculating the externally radiated aerodynamic noise caused by a car according to Lighthill' s theory. Then the fluctuation pressure field produced by the side mirror of a Santana car was studied in wind tunnel experiments. The highest fluctuation pressure level had reached 132.5dB on the surface of the car body at a speed of 90 km/h.Finally the aerodynamic noise caused by the side mirror alone at the distance of 7.5m from the car was calculated by derived...

This paper derived a formula for calculating the externally radiated aerodynamic noise caused by a car according to Lighthill' s theory. Then the fluctuation pressure field produced by the side mirror of a Santana car was studied in wind tunnel experiments. The highest fluctuation pressure level had reached 132.5dB on the surface of the car body at a speed of 90 km/h.Finally the aerodynamic noise caused by the side mirror alone at the distance of 7.5m from the car was calculated by derived formula and was over 60 dB at a speed of 146 km/h.

本文根据Lighthill的声模拟理论推导了轿车高速行驶时产生的外部气流辐射声的计算方法。通过风洞试验研究了桑塔纳轿车后视镜产生的脉动压力场的分布情况,测出在相当于90km/h的车速下,作用在车身表面的脉动压力级最大处达132.5dB。最后,用本文导出的计算方法求出了当车速为146km/h时,单由后视镜产生的距轿车中心7.5m处的外部气流辐射声即已超过60dB。

This paper studied the fluctuation pressure field behind the back mirror of a Santana car by wind tunnel experiments. It was found that most of the energy of fluctuation pressure was concentrated on the outer surfaces of vent window and front side window of the car. The energy was enormous with a highest value of about 132.5 dB at the car speed of 90 km/h. This was a strong sound source transmitting aerodynamic noise into the passenger compartment. Finally, the power of aerodynamic noise was...

This paper studied the fluctuation pressure field behind the back mirror of a Santana car by wind tunnel experiments. It was found that most of the energy of fluctuation pressure was concentrated on the outer surfaces of vent window and front side window of the car. The energy was enormous with a highest value of about 132.5 dB at the car speed of 90 km/h. This was a strong sound source transmitting aerodynamic noise into the passenger compartment. Finally, the power of aerodynamic noise was proved theoretically to be proportional to the square of airflow fluctuation pressure and a calculation example for Santana sedan was also given.

本文通过风洞试验研究了桑塔纳轿车后视镜产生的脉动压力场的分布情况。发现其脉动压力的能量主要集中在轿车通风窗与前侧窗的外表面位置,且其能量很大,相当于90km/h的车速下,最大处脉动压力级达132.5dB,成为一个大声源,透过玻璃向车内传递气流噪声。最后,根据理论推导证明了传递到车室内的气流噪声功率与脉动压力的平方成正比,并近似估算出在90km/h速度下由桑塔纳后视镜产生的传递到车内的气流噪声功率约为2.51×10~3W。

This paper derives a practical theory to solve the fluctuation pres-sure problem resulted from a moving automobile by transforming the N-S equa-tion to the vorticity equation. The fluctuation pressure field behind a Santanaside-mirror is solved with numerical calculation by applying this thoery. The re-sults are compared with those from wind tunnel experiment and the former isfound to be in coincidence with the latter,

通过对常规的N-S方程进行变形处理,化为涡量方程的形式,导出了适合于工程应用的求解由于汽车运行而产生的脉动压力场的理论计算公式.最后利用数值解法计算了汽车后视镜产生的脉动压力场,并与风洞试验结果进行了比较,取得了良好的效果.

 
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