Liner cavitation erosion results from pressure fluctuation of water coolant around cylinders. The characteristics of acoustic field of water chamber are especially important to estimate the potential of liner cavitation. The specialty of water chamber geometry requires a new impedance model of the opening ports, which was simulated by combining a one dimensional sound pipe with piston sound source at infinite plate. The validity of the proposed impedance model has been confirmed by the comparison of attenuation ratio with experiment of actual cylinder block. By changing the clearance between piston and cylinder liner, the influence of cylinder vibration acceleration on water pressure variation was studied, which revealed that the larger clearance results in stronger pressure fluctuation dominated by certain frequencies components. The pressure fluctuation induced by the vibration of whole walls was compared with that induced by the vibration of one cylinder, it revealed that integration of liner and cylinder block may reduce the amplitude of pressure fluctuation.

缸套周围的冷却水压力波动导致缸套气蚀。水室声场特性对于估计衬管空化潜力尤为重要。水室几何形状的特殊性需要一个新的开口阻抗模型，该模型是通过将一维声管与无限板活塞声源相结合来模拟的。通过衰减比与实际气缸体实验的比较，证实了所提出的阻抗模型的有效性。通过改变活塞与缸套之间的间隙，研究了缸体振动加速度对水压变化的影响，发现间隙越大，以某些频率分量为主的压力波动越大。