Dynamic Characteristics of Unsteady Aerodynamic Pressure on an Enclosed Housing for Sound Emission Alleviation Caused by a Passing High-Speed Train
Abstract
:1. Introduction
2. Numerical Methodology
2.1. Geometry
2.2. Computational Domain and Mesh
2.3. Numerical Method
2.4. Layout of Measurement Points
3. Validation
4. Results and Discussion
4.1. Wave Propagation
4.2. Extreme Pressure, Duration of Extreme Pressure and Impact Effects
4.3. Dominant Frequency and Decay Rate of the Aerodynamic Pressure after the Train Exits
5. Conclusions
- (1)
- The unsteady aerodynamic pressure is complicated and aperiodic when the train is running in the enclosed housing for sound emission alleviation. The reasons for the variation in the aerodynamic pressure are clearly caused by the propagation of the aerodynamic pressure wave, similar to that in a tunnel.
- (2)
- The extreme aerodynamic pressure at the central region is always higher than those close to the entrance and exit. In particular, negative and positive extreme pressures appearing in the middle section are −2153 Pa and 1298 Pa, respectively. The maximum peak-to-peak pressure is 3451 Pa.
- (3)
- To further quantify the dynamic characteristics of the train-induced aerodynamic pressure on the housing for sound emission alleviation, an ideal model of aerodynamic pressure is proposed using the duration of the extreme aerodynamic pressure and the pressure change rate. The longest duration of the extreme aerodynamic pressure appears in the middle section, and the highest pressure change rate occurs at the entrance section. In other sections, the pressure change rate is relatively close. The ideal model is much simpler than the original aerodynamic pressure and can be adopted to calculate the structural responses of the housing for sound emission alleviation. The rationality of the parameters in the ideal model needs further studies.
- (4)
- For the special enclosed housing for sound emission alleviation, the longest durations of the positive and negative extreme aerodynamic pressures are calculated as 1.41 s and 1.04 s, respectively. The highest positive and negative pressure change rates are calculated as 9.881 kPa/s and −10.415 kPa/s, respectively. In other sections, the average pressure change rate is calculated as 5.4 kPa/s and −5.9 kPa/s.
- (5)
- After the train exits the housing for sound emission alleviation, the aerodynamic pressure reverts to periodic decay curves. The pressure amplitude at the central region is always higher than those close to the entrance/exit. To better understand the aerodynamic pressure in this process, the dominant frequency and decay rate are proposed to express the dynamic characteristics. For the special enclosed housing for sound emission alleviation, the dominant frequency is identified as 0.2 Hz, and the decay rate is calculated as 0.262.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Sections | Ppmax (Pa) | Pnmax (Pa) | Peak-to-Peak (Pa) |
---|---|---|---|
1 | 1090 | −1020 | 2110 |
2 | 1047 | −1088 | 2135 |
3 | 1145 | −1607 | 2752 |
4 | 1237 | −2076 | 3312 |
5 | 1285 | −2111 | 3396 |
6 | 1298 | −2153 | 3451 |
7 | 1277 | −2023 | 3300 |
8 | 1227 | −1963 | 3190 |
9 | 1170 | −1212 | 2382 |
10 | 944 | −909 | 1853 |
11 | 799 | −936 | 17 |
Sections | Ppmax | Pnmax | ||
---|---|---|---|---|
Td (s) | (kPa/s) | Td (s) | (kPa/s) | |
S1 | 0.222 | 9.881 | 0.154 | −10.415 |
S3 | 1.379 | 3.288 | 0.347 | −5.488 |
S6 | 1.410 | 5.780 | 1.041 | −6.569 |
S9 | 1.059 | 6.227 | 0.719 | −5.842 |
S11 | 0.356 | 6.366 | 0.526 | −5.609 |
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Jing, H.; Ji, X.; He, X.; Zhang, S.; Zhou, J.; Zhang, H. Dynamic Characteristics of Unsteady Aerodynamic Pressure on an Enclosed Housing for Sound Emission Alleviation Caused by a Passing High-Speed Train. Appl. Sci. 2022, 12, 1545. https://doi.org/10.3390/app12031545
Jing H, Ji X, He X, Zhang S, Zhou J, Zhang H. Dynamic Characteristics of Unsteady Aerodynamic Pressure on an Enclosed Housing for Sound Emission Alleviation Caused by a Passing High-Speed Train. Applied Sciences. 2022; 12(3):1545. https://doi.org/10.3390/app12031545
Chicago/Turabian StyleJing, Haiquan, Xiaoyu Ji, Xuhui He, Shifeng Zhang, Jichao Zhou, and Haiyu Zhang. 2022. "Dynamic Characteristics of Unsteady Aerodynamic Pressure on an Enclosed Housing for Sound Emission Alleviation Caused by a Passing High-Speed Train" Applied Sciences 12, no. 3: 1545. https://doi.org/10.3390/app12031545