Unsteady surface pressure measurements of standard spinning missile model in supersonic flow
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摘要: 为了获得旋转导弹模型表面复杂的压力变化，设计了一套嵌入式无线压力测量系统，该系统能够以1 kHz的采样频率对8个压力通道进行同步采集。该绝对压力测量系统的量程为30 PSI，静态测量误差小于5/10 000；在连接10 cm的测压软管后，系统的动态延迟小于1.16 ms，信号幅值衰减小于1%。利用该嵌入式的无线测压系统，在高速风洞中开展了模型表面压力测试，对旋转导弹模型的关键区域多点的表面压力进行了测量，获得了表面压力的动态特征。结果表明：所提出的非定常表面压力测试技术可同步多点测量旋转导弹模型表面压力，为开展相关旋转模型气动特性风洞试验提供了一种有效的非定常表面压力测试手段。Abstract: In order to obtain complex pressure changes of the spinning missile model, an embedded wireless pressure measurement system was designed, which can simultaneously acquire 8 pressure channels at a sampling frequency of 1 kHz. The absolute pressure measurement system has a range of 30 PSI and a static measurement error of less than 5/10 000. After connecting a 10 cm pressure measuring hose, the delay of the system is less than 1.16 ms, and the signal amplitude attenuation is less than 1%. By using the embedded wireless pressure measurement system, the model surface pressure test was carried out in a high-speed wind tunnel. The pressure in the critical area of the spinning missile model is measured and the dynamic characteristic of the surface pressure is obtained. The result shows that the unsteady pressure measurement technique proposed in this paper can synchronously measure the surface pressure of rotating model, which provides an effective unsteady surface pressure measurement method for wind tunnel test of rotating missile.
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图 5 导弹模型旋转一周过程中舵片的偏角变化
Figure 5. The angle change of missile canard during the missile rotation
图 10 在无风条件下，导弹模型以12 Hz频率旋转时，#2测压点的测量结果
Figure 10. The pressure of No.2 pressure tap (v=0 m/s, f=12 Hz)
图 11 无风条件下，f=12 Hz，#2测压点压力信号的幅频特性
Figure 11. The amplitude-frequency characteristic of No.2 pressure tap's signal (v=0 m/s, f=12 Hz)
图 12 Ma=1.5、α=8°、f=12 Hz时，弹体旋转一周过程中，#8测压点的压力变化
Figure 12. The pressure change of No.8 pressure tap (Ma=1.5, α=8°, f=12 Hz)
图 13 单独弹体表面#8测压点的压力信号的幅频特性
Figure 13. The amplitude-frequency characteristic of No.8 pressure signal
图 14 Ma=1.5、α=8°、f=12 Hz时，7个车次的#8测压点单周期压力变化
Figure 14. The pressure change of No.8 pressure tap in seven independent test (Ma=1.5, α=8°, f=12 Hz)
图 15 Ma=1.5、α=8°、f=12 Hz时，舵片下游#2测压点压力变化
Figure 15. The pressure of No.2 pressure tap (Ma=1.5, α=8°, f=12 Hz)
图 16 弹体表面#2测压点压力信号的幅频特性
Figure 16. The amplitude-frequency characteristic of No.2 pressure tap's signal
表 1 嵌入式无线测压系统技术参数
Table 1. Technical parameters of embedded wireless pressure measurement system
量程 精度 通道数 采样率 30 PSI 0.05% FS 8 1 kHz 
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表 2 无风条件下，f=12 Hz，#2测压点的测量结果
Table 2. The pressure of No.2 pressure tap (v=0 m/s, f=12 Hz)
大气压 平均测量结果 标准差 103.60 kPa 103.59 kPa 0.10 kPa
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