| 引用本文: | 王聪,何超杰,余德磊.回转体并联入水运动状态预测[J].哈尔滨工业大学学报,2021,53(6):21.DOI:10.11918/201906068 |
| WANG Cong,HE Chaojie,YU Delei.Prediction of the state of revolution bodies entering water in parallel[J].Journal of Harbin Institute of Technology,2021,53(6):21.DOI:10.11918/201906068 |
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| 摘要: |
| 为研究运动体并联入水过程中的运动特性,预测运动体之间的相对运动趋势,结合数值模拟的结果,推导了运动体侧向和偏航运动预测公式,并且提出了避免失稳的策略.首先,验证了数值计算方法的有效性；然后,根据数值计算结果对急动度提出限制性假设,从而得到回转体并联入水侧向位移和偏航角的预测公式.其次,通过预测公式研究了初始空化数和初始净距对侧向和偏航运动特性的影响机理；最后,基于运动状态因数的概念研究了碰撞和过度远离的运动状态,并且提出了避免回转体运动失稳的策略.研究结果表明: 预测公式与数值计算结果符合良好；初始空化数较低时头部压力对侧向和偏航运动具有促进作用,且初始空化数越小,则侧向名义急动度和偏航角名义急动度越大,表明侧向和偏航运动所受促进作用越强；而初始净距较小时,内侧压力对侧向和偏航运动具有抑制作用,且初始净距越小,则侧向修正因子和偏航角修正因子越大,表明侧向和偏航运动所受抑制作用越强；初始条件和回转体外形共同决定了并联入水过程中回转体的运动状态；应将入水初速度和初始净距控制在合理的范围内以避免运动失稳. |
| 关键词: 回转体 并联入水 空泡形态 运动特性 数值计算 |
| DOI：10.11918/201906068 |
| 分类号:TV131.2 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(11672094) |
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| Prediction of the state of revolution bodies entering water in parallel |
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WANG Cong,HE Chaojie,YU Delei
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（School of Astronautics, Harbin Institute of Technology, Harbin 150001, China）
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| Abstract: |
| To study the motion characteristics of moving bodies in the course of high-speed water entry in parallel, and to predict the mutual influence trends between moving bodies, combined with the results of numerical simulations, the prediction formulas for the lateral and yaw motions of the moving body were derived, and strategies to avoid instability were proposed. Firstly, the validity of the numerical calculation method was verified, and based on the numerical calculation results, a restrictive hypothesis about jerk was put forward, so as to obtain the prediction formula for the lateral displacement and yaw angle of parallel water-entry revolution bodies. Secondly, the effects of initial cavitation number and initial clearance distance on lateral and yaw motion characteristics were studied through the prediction formula. Finally, based on the concept of kinematic factor, the kinematics of collision and excessive distance was studied, and a strategy to avoid the instability of revolution bodies was proposed. Results show that the prediction formula was in good agreement with the numerical calculation results. When the initial cavitation number was small, the head pressure promoted lateral and yaw movements, and the smaller the initial cavitation number was, the greater the nominal lateral jerk and yaw angle were, indicating that the lateral and yaw motions were promoted more strongly. When the initial clearance distance was small, the inner pressure inhibited the lateral and yaw movements, and the smaller the initial clearance distance was, the larger the lateral correction factor and the yaw angle correction factor were, indicating that the lateral and yaw motions were inhibited more strongly. The initial conditions and the shape of the revolution body together determine the state of the revolution body. The initial speed of water entering and the initial clearance distance should be controlled within a reasonable range to avoid motion instability. |
| Key words: revolution body entering water in parallel cavity shape motion characteristics numerical simulation |
