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Applied Physics 2025
非定常脉冲射流压力场演化实验研究
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Abstract:
本文通过PIV实验研究了非定常脉冲射流压力场的演化特性，探究了其尾迹流场中的动量输运特性及其推进性能提升机制。通过PIV实验测量得到的速度场，采用直接积分的方法重构得到流场的压强场。通过对喷嘴出口截面的压强积分和速度积分，分析压强和流量通量对于涡环的推进性能提升的影响。实验结果表明，非定常脉冲射流产生的非定常推力相比于等效定常射流产生的定常推力，具有推力增强的特性。该推力增强特性的机制主要由脉冲射流所形成的涡环，在其产生和演化过程中伴随的两方面效应所导致的。这两方面效应其一是喷管出口平面的超压效应；其二则是涡环尾迹的卷吸增强效应。
In this paper, the evolution characteristics of unsteady pulse jet pressure field are studied by PIV experiment, and the momentum transport characteristics in the wake flow field and its propulsive performance improvement mechanism are investigated. The velocity field measured by PIV experiment is reconstructed by direct integration method to obtain the pressure field of the flow field. The influence of pressure and flow flux on the propulsive performance of vortex ring was analyzed through the pressure integral and velocity integral of nozzle exit section. The experimental results show that the pulsed jet enhances the thrust enhancement, relative to the thrust generated by an equivalent steady continuous jet. The underlying mechanism of this thrust enhancement is mainly associated with the vortex ring formed by the pulsed jet, which is accompanied by two effects during its generation and evolution. They are the overpressure effect at the nozzle plane and the suction enhancement effect at the vortex ring wake.
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