【摘要】 为了研究非稳态平行射流推力耦合特性规律，建立了数值仿真模型，考察了射流速度函数、中心轴距和时间相位差对推力耦合特性的影响，并通过试验数据对模型进行了验证。结果表明，在中心轴距为1.5D(D为喷嘴直径)下，双喷嘴与单喷嘴射流的平均推力比值K随时间相位差增大而增大（一个射流周期内），最大推力损失达到8.53%；在较大时间相位差时出现K>1，即耦合推力呈现增强效应；最大推力增强仅为0.42%，单纯依靠涡环间的相互诱导作用产生的推力增强效应很微弱；当中心轴距为2.5D和2.0D时，平均推力比值K随时间相位差增大则呈现出先减后增的规律，其范围分别为0.994 5～0.997 3和0.986 6～0.997 5。研究成果可为水下非稳态推进器的设计提供参考，尤其在推力增强方面的新发现，为水下高效推进器的设计提供新思路。更多还原

【Abstract】 In order to study the thrust coupling characteristics of unsteady parallel jet flows,a numerical simulation model was established to investigate the effects of jet velocity function,central axis distance,and time phase difference on the thrust coupling characteristics.The model was verified using experimental data.The results show that when the central axis distance is 1.5D(where D is the nozzle diameter),the average thrust ratio K between the dual-nozzle and single-nozzle jets increases with the increase in time phase difference within one jet cycle,with a maximum thrust loss of 8.53%.At larger time phase differences,K>1 occurs,indicating that the coupled thrust exhibits an enhancement effect.However,the maximum thrust enhancement is only 0.42%,suggesting that the thrust enhancement effect generated solely by the mutual induction between vortex rings is very weak.For central axis distances of 2.5D and 2.0D,the average thrust ratio K ranges from 0.994 5 to 0.997 3 and from 0.986 6 to 0.997 5,respectively,and both exhibit a trend of first decreasing and then increasing as the time phase difference increases.The research findings can provide a reference for the design of underwater unsteady propulsors.In particular,the new insights into thrust enhancement offer new ideas for the development of high-efficiency underwater propulsors.更多还原